Differential operational amplifier with common mode feedback

Details Differential operational amplifier with common mode feedback Differential operational amplifier with common mode feedback

1983-10-18

1985-08-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330277, H03F 316, H03F 345

Patent

active

045338760

ABSTRACT:
A differential operational amplifier is provided with a feedback loop which continuously adjusts the common mode voltage level of the amplifier so that it lies in the center of the dynamic range of the amplifier. The feedback loop measures the instantaneous common mode voltage level and compares it with a reference voltage which is set to reflect the desired common mode voltage. An error signal is generated and fed back into the amplifier to adjust the instantaneous common mode voltage level towards the reference level. Frequency compensation is also provided to overcome the phase shift introduced by the use of RC networks.

REFERENCES:
patent: 3559193 (1971-01-01), Savaglio et al.
patent: 3991380 (1976-11-01), Pryor
patent: 4283683 (1981-08-01), Main
patent: 4320347 (1982-03-01), Haque
patent: 4393347 (1983-07-01), Looper
patent: 4429416 (1984-01-01), Page
patent: 4450368 (1984-05-01), Spence
patent: 4460873 (1984-07-01), Hester

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