Circuit for converting a fully differential amplifier to a singl

Details Circuit for converting a fully differential amplifier to a singl Circuit for converting a fully differential amplifier to a singl

1987-01-14

1988-01-19

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330301, H03F 345

Patent

active

047206861

ABSTRACT:
A circuit which converts differential outputs of a fully differential amplifier to a single output using a buffer amplifier is provided. The fully differential amplifier has common-mode feedback provided by a differential feedback stage. An input of the common-mode differential feedback stage is connected to a predetermined one of the differential outputs to maintain the predetermined output at a reference voltage potential. The buffer amplifier uses diffused or well resistors and a single-ended differential amplifier. The buffer amplifier has a balanced structure which minimizes noise and resistor nonlinearity output errors. The circuit also maintains excellent power supply rejection.

REFERENCES:
patent: 4634996 (1987-01-01), Gulczynski

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