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Solutions Search - LT1001 - Precision Operational Amplifier

LT1001 Precision Absolute Value Circuit

Nov 1st 1983
An absolute value circuit as as a full wave rectifier. Positive input voltqges cause the first amplifier to act as a unity gain inverter. The second amplifier inverts thiis output again to produce a positive outut voltage. Negative input voltages cause the + input of the second amplifier to move positive to a voltage of 2/3Vin. ...

Circuit LTspice 

 

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 

 

Instrumentation Amplifier with ±300V Common Mode Range and CMRR > 150dB

Nov 1st 1983
The differential input voltage is sampled on a flying capacitor and then its charge is transferred to a fixed capacitor with is then amplified to produce an output voltage. The use of high voltage photo driven FET switches rejects very high input common mode voltages. ...

Circuit 

 

LT1001 Precision Current Sink

Nov 1st 1983
A non-inverting amplifier configuration can force an input control voltage across a ground referred resistor. This creates a precise amount of current flow. This current must be sunk by the external transitors so the same amount of current flows to ground from a positive supply referred load circuit. ...

Circuit 

 

Photodiode Amplifier

Nov 1st 1983
Low input bias current amplifiers can be used to accurately detect the amount of current flowing in a photodiode. An output voltage, 1V/uA, is created by forcing the reverse diode current to flow from the amplifier output through a large valued feedback resistor. ...

Circuit 

 

Thermally Controlled NiCad Charger

Nov 1st 1983
A voltage controlled current (maximum of 1A) is used to charge a NiCd battery. The control voltage is derived from the temperature difference between the battery and the ambient air. The charge current is reduced as the battery heats up. ...

Circuit 

 

Linearized Platinum Resistance Thermometer with ±0.025°C Accuracy Over 0 to 100°C

Nov 1st 1983
Platinum RTD's are typically driven with a constant current so that their resistance value directly translates to a temperature dependant voltage. Here the LT1001 and the LM129 create a constant current through the input 10K resistor which all flows through the sense resistor. A second amplifier inverts the signal to provide ...

Circuit 

 

Dead Zone Generator

Nov 1st 1983
BIPOLAR SYMMETRY IS EXCELLENT BECAUSE ONE DEVICE, Q2, SETS BOTH LIMITS. This circuit outputs 0V for a controlled range of input voltage. When the input voltage exceeds the set voltage in either polarity the output signal moves with unity gain. ...

Circuit 

 

Microvolt Compararator with TTL Output

Nov 1st 1983
Amplifiers can easily be used as comparators although somewhat slower than dedicated circuits. Very accurate comparison threshold is provided by the low offset of the amplifier. Feedback to one of the offset adjust pins adds hysteresis to prevent oscillations when the inputs are close to each other. ...

Circuit 

 

Precision Current Source

Nov 1st 1983
A non-inverting amplifier configuration can force an input control voltage across a ground referred resistor. This creates a precise amount of current flow. This current must be sunk by the external transitors so the same amount of current flows from ground and sourced to a negative supply referred load circuit. ...

Circuit LTspice 

 

LT1001 Strain Gauge Signal Conditioner with Bridge Excitation

Nov 1st 1983
A buffered 7V reference provides a 5V excitation voltage to a balanced strain gauge resistor bridge. To provide a 0V output when the bridge is perfectly balanced, a second amplifier biases the bottom of the bridge to a negative compliment of the 5V excitation voltage. Circuit gain is set such that a 1% bridge resistance imbalance ...

Circuit 

 

Linearized Platinum Resistance Thermometer with ±0.025°C Accuracy Over 0 to 100°C

Nov 1st 1983
The LT1001 significantly advances the state-of-theart of precision operational amplifiers. In the design, processing, and testing of the device, particular attention has been paid to the optimization of the entire distribution of several key parameters. Consequently, the specifications of the lowest cost, commercial temperature ...

Circuit