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Solutions Search - High Speed Amplifiers (GBW > 50MHz)

Single-Ended to Differential Driver Circuit for the LTC2387-18 SAR ADC

Doug Stuetzle - Senior Analog Applications Engineer Sep 26th 2016
The LTC®2387-18 is a 15Msps, highly linear, low-noise SAR converter with differential inputs. The combination of excellent linearity and wide dynamic range makes this ADC ideal for high speed imaging and instrumentation applications. No-latency operation provides a unique solution for high speed control loop applications. ...

Blog Post Circuit LTspice 

 

LTC6244 High Speed Peak Detector

Hassan Kelley - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Aug 1st 2016
Introduction Peak detectors capture the extrema of the voltage signal at its input. A positive peak detector captures the most positive point of the input signal and a negative peak detector captures the most negative point of the input signal. Ideally the output of the peak detector circuit tracks or follows the input voltage ...

Blog Post Circuit LTspice 

 

Baseband Design Example for LTC5589/LTC5599 Low-Power IQ Modulator

Bruce Hemp - Applications Section Leader Jul 1st 2016
Introduction This basic low power modulator was described in the LT Journal Nov 2015 article. In this blog post, we will show how to: Use simulation to validate the filter design, and Reduce DC offsets by utilizing Differential Amplifiers for the baseband drive. Also shown are some miscellaneous tips to help complete ...

Blog Post Circuit LTspice 

 

LTC6268-10 Oscilloscope Differential Probe

Dec 1st 2015
The LTC6268-10 is a single 4GHz FETinput operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It is a decompensated op ...

Circuit LTspice 

 

LTC6363 LTC6363 Used as Lowpass Filter/Driver with 10VP-P Singled-Ended Input, Driving a SAR ADC

Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...

Circuit 

 

LTC6363 Differential AV = 1/9 Configuration Using an LT®5400 Quad-Matched Resistor Network

Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...

Circuit 

 

LTC6363 Single-Ended-to-Differential Conversion of a 20VP-P Ground-Referenced Input with Gain of AV = 0.5 to Drive an ADC

Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...

Circuit 

 

LTC6269-10 20kΩ Gain 210MHz Transimpedance Amplifier

Apr 7th 2015
The LTC®6268-10/LTC6269-10 is a single/dual 4GHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It ...

Circuit 

 

LTC6268 20kΩ Gain 65MHz Trans-Impedance Amplifier

Apr 7th 2015
The LTC®6268/LTC6269 is a single/dual 500MHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low inputreferred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, CCD output buffers, and high-impedance sensor ...

Circuit 

 

LT6237 Single Supply, Low Noise, Low Power, Bandpass Filter with Gain =10

Sep 25th 2014
The LT®6236/LT6237/LT6238 are single/dual/quad low noise, rail-to-rail output op amps that feature 1.1nV/√Hz input referred noise voltage density and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gain bandwidth product and a 70V/μs slew ...

Circuit 

 

LT6237 Low Power Avalanche Photodiode Transimpedance Amplifier IS = 3.3mA

Sep 25th 2014
The LT®6236/LT6237/LT6238 are single/dual/quad low noise, rail-to-rail output op amps that feature 1.1nV/√Hz input referred noise voltage density and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gain bandwidth product and a 70V/μs slew ...

Circuit 

 

ADC Driver With Single-Ended Input to Differential Output

Dec 14th 2009
The LT6350 is a rail-to-rail input and output low noise single-ended to differential converter/ADC driver featuring fast settling time. It converts a high or low impedance, single-ended input signal to a low impedance, balanced, differential output suitable for driving high performance differential succesive approximation register ...

Circuit 

 

Single 2.7V Supply 4MHz 4th Order Lowpass Butterworth Filter

Oct 2nd 2009
Benefiting from low voltage operation and rail-to-rail output, a low power filter that is suitable for antialiasing can be built as shown in this circuit. On a 2.7V supply the filter has a passband of approximately 4MHz with 2VP-P input signal and a stopband attenuation that is greater than –75dB at 43MHz. The resistor and ...

Circuit 

 

700kHz, 1MΩ Single Supply Photodiode Amplifier

Oct 2nd 2009
The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth. Supply current was a low 2.2mA. ...

Circuit 

 

LTC6406: 133MHz Differential Amplifier with External Gain Set, Impedance Matching to a 75Ω Source and Level Shifting

Aug 3rd 2007
This circuit shows an example of a single-ended-to-differential amplifi er matching a 75Ω source and level shifting from a 2.5V input common mode to a 1.25V output common mode voltage (typical level shifting required from a 5V single-ended circuit to a 3V differential circuit to drive a high speed ADC). The singleended- ...

Circuit LTspice 

 

Single Ended To Differential Transimpedance Amplifier

Aug 3rd 2007
This circuit shows the LTC6406 connected as a single-ended transimpedance amplifier with 20kΩ of transimpedance gain. The BF862 JFET buffers the LTC6406 input, drastically reducing the effects of its bipolar input transistor current noise. The VGS of the JFET is now included as an offset, but this is typically 0.6V so ...

Circuit 

 

400MHz, 5V Single Supply Video Driver (AC Coupled)

Sep 22nd 2006
The LT6557 400MHz triple video driver is specifically designed to operate in 5V single supply AC-coupled applications as shown. The input biasing circuitry is contained on-chip for minimal external component count. A single resistor programs the biasing level of all three channels. ...

Circuit 

 

Low Noise Low Power DC Accurate Single Supply Photodiode Amplifier

Sep 21st 2006
A low noise JFET Q1 acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. ...

Circuit 

 

Very Low Noise Large Area Photodiode Amplifier

Aug 22nd 2006
Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. AC coupling a bootstrap JFET across ...

Circuit 

 

Small Area Photodiode in Normal TIA Configuration

Aug 22nd 2006
Small area photodiodes have low capacitance. To maintain low noise operation it is important to keep the input capacitance low so that the miniscule input noise current of the CMOS amplifier, and not the voltage noise, dominates the overall circuit noise. The total input capacitance from the amplifier in this circuit is the ...

Circuit 

 

Low Noise Fully Differential Buffer/Amplifier

Aug 22nd 2006
Useful in RFID baseband signal processing is a differential amplifier with an input impedance set to match the differential output impedance of a RF demodulator. The differential input impedance is 2*Rin and the gain is Rg/Rin. Capacitors Cf and Cin can be used to set the bandwidth of the amplifier. For DC biasing the common ...

Circuit 

 

Large Area Photodiode Bootstrapping

Aug 22nd 2006
Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. The addition of a low noise JFET ...

Circuit 

 

Wide Bandwidth Photodiode Amplifier

Aug 22nd 2006
Wide bandwidth performance from a small photodiode requires minimizing the total input capacitance. In this circuit the amplifier's differential input capacitance is bootstrapped by the feedback with R1 and R2. Choosing the amplifier input that is at the corner of the package for the dual LTC6244 also minimizes pin-to-pin capacitance. ...

Circuit 

 

Single-Ended to Differential Converter with Gain of +2 and Common Mode Control

Aug 15th 2006
Because the gains of each channel of the LT6411 can be configured independently, the LT6411 can be used to provide a gain of +2 when amplifying differential signals and when converting single-ended signals to differential. With both channels connected to a single-ended input, one channel configured with a gain of +1 and the ...

Circuit 

 

A 133MHz Differential Amplifier with External Gain Set, Impedance Matching to a 75Ω Source and Level Shifting

Dec 8th 2005
Complete single ended 75Ω input impedance to differential out, level shifting 2.5V input to 1.25V differential common mode, single ended to differential gain of 2 using external resistors circuit example. ...

Circuit LTspice 

 

Three Channel, Single Supply Video Line Driver (AC Coupled)

Nov 21st 2003
The LT6553 ultra-high-speed triple video driver configured for single-supply AC-coupled operation. This part is ideal for HD or high-resolution workstation applications that demand high bandwidth and fast settling. The amplifier gains are factory-set to two by internal resistors ...

Circuit 

 

Triple Video Line Driver (DC Coupled)

Nov 21st 2003
In DC-coupled systems, the video swings are fixed in relation to the supplies used, so back-terminated cable drivers need only provide 2V of output range when optimally biased. In most cases, this permits operation on lower power supply potential(s) than with AC-coupling (unclamped mode). Generally DC-coupled circuits use split ...

Circuit 

 

Clamped AC-Input Video Cable Driver

Sep 26th 2003
This circuit shows a means of driving composite video on standard 75Ω cable with just a single 3.3V power supply. This is possible due to the low output saturation levels of the LT6205 and the use of input clamping to optimize the bias point of the amplifi er for standard 1VP-P source video. The circuit provides an active gain ...

Circuit 

 

YPBPR to RGB Converter

Sep 26th 2003
In this realization of a component video (YPBPR) to RGB adapter, amplifier count is minimized by performing passive arithmetic at the outputs, but this requires higher gains, thus a higher supply potential is needed for this (for at least the positive rail). One small drawback to this otherwise compact solution is that the ...

Circuit 

 

Stepped Gain Photodiode Amplifier

Jun 23rd 2003
At low signal levels, the circuit has a high 100kΩ transimpedance gain, but at high signal levels the circuit automatically and smoothly changes to a low 3.1kΩ gain. The beneit of a stepped gain approach is that it maximizes dynamic range. ...

Circuit 

 

3.3V Baseband Video Splitter/Cable Driver (DC Coupled)

May 2nd 2003
A simple video splitter application using an LT6206. Both amplifiers are driven by the input signal and each is configured for a gain of two, one for driving each output cable. Here again careful input biasing is required (or a negative supply as suggested previously). ...

Circuit 

 

Low Noise, Low Power Photodiode Amplifier

Aug 29th 2002
Low Noise, Low Power Photodiode Amplifier is Better than Monolithics. Low Bias Current, Low Current Noise and Unity Gain Stability Keep the Circuit Operational from 0ohm to several Gohm. Amplifier input noise density and gain-bandwidth product were measured to be 2.4nV/rtHz and 100MHz, respectively, with only 3.8mA supply current. ...

Circuit 

 

LT6550 RGB to YPBPR Component-Video Conversion

Jun 27th 2002
Figure 15 shows a method of generating the standard definition YPBPR signals from an RGB source using a pair of LT6550 triple amplifiers. It should be noted that to ensure Y includes a correct sync, correct syncs should be present at all three inputs or else added directly at the Y output (gated 8.5mA current sink or 350Ω ...

Circuit LTspice 

 

S-Video Splitter (AC Coupled)

Jun 27th 2002
This figure shows an LT6551 quad amplifier driving two sets of “S-video” (Y/C format) output cables from a single Y/C source. Internal gain-setting resistors within the LT6551 reduce part-count. ...

Circuit 

 

3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver (DC Coupled)

Jun 27th 2002
The LT6551 drives four cables and operating from a single 3.3V supply. The inputs need to have signals centered at 0.83V for best linearity. This application would be typical of standard-definition studio-environment signal distribution equipment (RGBS format). ...

Circuit 

 

Single Supply 10MHz Lowpass Filter Features the LT1819 Op Amp and Adjustable Bandwidth Up to 20MHz

Jun 25th 2002
Low noise, low distortion LT1819 circuit trades parts count and components sensitivity for an adjustable bandwidth - up to 20MHz Diff in diff out circuit. Measured signal-to-noise plus distortion for LT1819 circuit is 71.5dB, just a little nosier than the fixed bandwidth LT6600-10 filter differential filter. ...

Circuit 

 

Single Supply 16-Bit ADC Driver

Aug 17th 2001
This circuit shows the LT6203 driving an LTC1864 unipolar 16-bit, 250ksps A/D converter. The bottom half of the LT6203 is in a gain of 1 and buffers the 0V negative fullscale signal VLOW into the negative input of the LTC1864. The upper half of the LT6203 is in a gain of 10, referenced to the buffered voltage VLOW and drives ...

Circuit 

 

Ultralow Noise, 2.4GHz Gain Bandwidth Large-Area Photodiode Amplifier

Jun 19th 2000
The combination of the ultralow noise JFET gain stage and the LT1806 low noise amplifier achieves the ultralow input noise performance. The circuit’s input voltage noise was measured at 0.95nV/rtHz. ...

Circuit 

 

High Speed RGB to YPBPR Converter

Jan 19th 2000
An LT6559 and an LT1395 can also be used to map RGB signals into YPBPR “component” video. The LT1395 performs a weighted inverting addition of all three inputs. The LT1395 output includes an amplification of the R input by –324/1.07k = –0.3. The amplifi cation of the G input is by –324/549 = –0.59. Finally, the B ...

Circuit 

 

Using All four Amplifiers of the LT1397 to Drive Large zCapacitive Loads

Jan 10th 1999
Four paralleled amplifiers increase load capacitor current drive capability. A small ballast resistor at each output increases isolates the effects of each amplifier's different output offset. ...

Circuit 

 

Micropower 1MHz V/F Converter

Jan 1st 1998
A 0V to 5V input produces a 0MHz to 1MHz output frequency. ...

Circuit 

 

LT1007/LT1037 Ultrapure 1kHz Sine Wave Generator

Jan 1st 1998
A lamp provides amplitude stability while the very low noise amplifier creates a pure sine wave signal. The R an C values set the oscillator frequency and the feedback resistor sets the lamp current and output amplitude. ...

Circuit LTspice 

 

Two Terminal Current Regulator

Dec 3rd 1997
The LT1635 combines an op amp with a 200mV reference. Scaling this reference voltage to a potential across resistor R3 forces a controlled amount of current to flow from the +terminal to the –terminal. Power is taken from the loop. ...

Circuit 

 

Acoustic Thermometry Measures Temperature To 0.1 Degree

Dec 1st 1990
Start Clock Launches Acoustic Pulse into Measurement Path, Sets Width Decode Flip-Flop High. Acoustic Paths Return Pulse, Amplified by Receiver, Trips Trigger, Resetting Flip-Flop. Resultant “Q” Width Output, Representing Path’s Temperature Dependent Transit Time, is Converted to Temperature Reading by Microprocessor. ...

Circuit 

 

Fast, 16-Bit Current Comparator

Jan 1st 1987
Precision op-amp used as pre-comparator. Schottky diodes in feedback limit output swing of amplifier to minimize slew delay. Resistive input structure can be tailored for different trip points; this one detects a current sink of >50uA at the input ...

Circuit 

 

LT1055 ±120V Output Precision Op Amp

Jan 1st 1987
Simple shunt regulators provide normal supply levels to the op amp and the external open-loop gain and buffer structure extends the output swing to nearly the high-voltage rails. Output transistors are protected by current-limiting. ...

Circuit LTspice 

 

Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz

Jan 1st 1987
With a typical open loop gain value of 20 million V/V, very high closed loop gain amplifiers can be implemented with remarkable accuracy. Even with such a high gain, the trimmed precision produces a dc output offset of only 20mV. ...

Circuit 

 

Exponential Voltage-to-Frequency Converter for Music Synthesizers

Jan 1st 1987
Logarithmic characteristic of BJT is used to provide an exponential control effect on V/F function. By using a multiple transistor array, a thermal stabilization circuit assures a constant operating point for the log function. ...

Circuit 

 

Temperature-to-Frequency Converter

Jan 1st 1987
Precision oscillator structure uses SCR effect to discharge integration capacitor. A temperature dependent device (LM134) effects the integrator trip point to form a variable interval. An output transistor detects the reset action and forms a logic pulse. ...

Circuit 

 

Low Noise, Wideband, Gain = 100 Amplifi er with High Input Impedance

Jan 1st 1987
Averaging of three identical input stages reduces random noise addition by √3. Each input stage has a gain of about 10.2, and the second stage adder is trimmed for an accurate overall 100x. ...

Circuit 

 

1Hz to 10kHz Voltage to Frequency Converter

Jan 1st 1987
JFET inputs with anti phase-reversal circuitry allow the LTC1055/56 to be used as a precision, ultra-high impedance comparator. The precision provides for very high linearity of the V/F generation while the high speed allows a large frequency range of operation. ...

Circuit 

 

DC Stabilized 1000uV/msec Op Amp

Nov 1st 1983
Adding a discrete output stage provides full control of the circuit operating currents thereby obtaining very fast ac signal response. The LT1001 is used to adjust the output dc offset to a very low value, uVs, not typical for very high speed amplifier designs. ...

Circuit