Differential amplifier

Details Differential amplifier Differential amplifier

1989-01-23

1989-11-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 69, H03F 345

Patent

active

048795216

ABSTRACT:
A circuit for a differential amplifier having common mode rejection means. The common mode voltage is applied to an inverting amplifier to derive a common mode signal in opposition to the applied common mode voltage. A portion of the applied common mode voltage is combined with the opposing common mode voltage in a ratio such that the resultant common mode signal has a null value. A voltage divider network coupled to the input of the amplifier provides an output corresponding to a differential signal and substantially independent of the common mode signal. Buffer amplifiers provide substantial isolation from stray capacitances and loading by the resistor elements, thereby enhancing the bandwidth of the circuit.

REFERENCES:
patent: 3761831 (1973-09-01), Foerster
patent: 4152659 (1979-05-01), Gordon

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