Amplifier for measuring low-level signals in the presence of hig

Details Amplifier for measuring low-level signals in the presence of hig Amplifier for measuring low-level signals in the presence of hig

1984-08-07

1985-11-05

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330311, 330261, H03F 368

Patent

active

045516871

ABSTRACT:
A high common mode rejection differential amplifier wherein two serially arranged Darlington amplifier stages (28, 44) are employed and any common mode voltage is divided between them by a resistance network (53). The input to the first Darlington amplifier stage (28) is coupled to a signal input resistor (8) via an amplifier (16) which isolates the input and presents a high impedance across this resistor. The output of the second Darlington stage (44) is transposed in scale via an amplifier stage (66) which has in its input a biasing circuit which effects a finite biasing of the two Darlington amplifier stages (28, 44).

REFERENCES:
patent: 4232271 (1980-11-01), Dobkin et al.

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