Balanced output analog differential amplifier circuit

Details Balanced output analog differential amplifier circuit Balanced output analog differential amplifier circuit

1987-04-10

1988-05-03

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H03F 345

Patent

active

047423080

ABSTRACT:
A differential operational amplifier circuit, having an input stage and an output stage, is balanced--i.e., is designed to have zero common mode component in its output--by means of a common mode feedback loop arrangement. This arrangement includes a common mode detector, connected for detecting the common mode signal component in a pair of outputs of the output stage of the circuit, and a pair of current steering devices, connected for drawing equal currents from each of the outputs of the input stage. During operation, the common mode detector feeds back a suitable control signal to each of the current steering devices, whereby the common mode component in the outputs is substantially completely suppressed.

REFERENCES:
patent: 4697152 (1987-09-01), Westwick

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