Amplifier for measuring low-level signals in the presence of high common mode voltage
Abstract
A high common mode rejection differential amplifier wherein two serially arranged Darlington amplifier stages are employed and any common mode voltage is divided between them by a resistance network. The input to the first Darlington amplifier stage is coupled to a signal input resistor via an amplifier which isolates the input and presents a high impedance across this resistor. The output of the second Darlington stage is transposed in scale via an amplifier stage which has its input a biasing circuit which effects a finite biasing of the two Darlington amplifier stages.
- Publication:
-
NASA Marshall Space Flight Center Report
- Pub Date:
- November 1985
- Bibcode:
- 1985msfc.reptR....L
- Keywords:
-
- Amplifier Design;
- Circuits;
- Differential Amplifiers;
- Resistors;
- Signal Measurement;
- Bias;
- Electrical Resistivity;
- Hall Effect;
- Impedance;
- Patents;
- Signal To Noise Ratios;
- Electronics and Electrical Engineering