High speed operational amplifier design

Details High speed operational amplifier design High speed operational amplifier design

2006-03-14

2006-03-14

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S250100, C375S345000, C330S257000

Reexamination Certificate

active

07013118

ABSTRACT:
A radio receiver portion of a transceiver includes a differential amplifier that is used to provide a fast response. A pair of input MOSFETs of the differential amplifier stage are coupled to an active load. A voltage follower circuit is coupled to each output stage of the two stage differential amplifier to drive a current through a load without reducing the output voltage. The voltage follower stages each include a current mirror that replicates current level defined by an input MOSFET of the voltage follower circuit and, by its configuration, a voltage level produced by the differential amplifier to the input MOSFET of the voltage follower circuit. Accordingly, the differential amplifier stage defines the amplification of the circuit while the voltage follower circuits replicate the amplified output with the ability to drive a load.

REFERENCES:
patent: 5371424 (1994-12-01), Quigley et al.
patent: 5506536 (1996-04-01), Yeung
patent: 6633191 (2003-10-01), Hu
patent: 6766148 (2004-07-01), Mohindra
patent: 6807406 (2004-10-01), Razavi et al.
patent: 6812781 (2004-11-01), Tsuchiya
patent: 2002/0041531 (2002-04-01), Tanaka et al.
patent: 2002/0075074 (2002-06-01), Wang et al.

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