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Solutions Search - LT1077 - Micropower, Single Supply, Precision Op Amp

Self Buffered Micropower Reference

Jan 1st 1987
The opamp provides controlled bias current to a shunt reference through its supply connection. Since the opamp can operate with both inputs and outputs at the low-side supply potential, the buffer action works properly for sourcing output current at the same voltage as the reference itself. ...

Circuit 

 

±250V Common Mode Range Difference Amplifier (AV = 1)

Jan 1st 1987
This is a modified difference amplifier- it has effectively added resistances from each input to ground to attenuate the common mode signal. This allows the wide input range without exceeding the Vcm of the opamp. ...

Circuit 

 

LTC1453/LT1077/LT1121 Isolated 4 – 20mA Current Loop

Jan 1st 1987
This circuit is a computer-controlled 4 – 20mA current loop. It is designed to operate on a single supply over a range of 3.3V to 30V. The circuit’s zero output reference signal, 4mA, is set by R1 and calibrated using R2, and its full-scale output current is set by R3 and calibrated using R4. The zero and full-scale ...

Circuit 

 

Megaohm Input Impedance Gain of 10 Difference Amplifier

Jan 1st 1987
THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE. THE PICO-AMPERE OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT1077 ALLOWS THE USE OF 1M SOURCE RESISTORS WITHOUT DEGRADATION IN PERFORMANCE. IN ADDITION, WITH MEGAOHM RESISTORS MICROPOWER OPERATION CAN ...

Circuit 

 

Two Terminal Current Source

Jan 1st 1987
The opamp buffers the upper potential of a shunt regulator to set a voltage drop on R1 equal to the reference. The net current to RL is the programmed R1 current plus the quiescent supply current of the opamp passing through the reference. ...

Circuit 

 

APD DC Coupled Current Monitor from 20V to 90V APD Bias

Jan 1st 1987
APD current monitor that operates at High Common Mode Voltage and simplifies signal conditioning using instrumentation amplifier and a Delta Sigma ADC. ...

Circuit