Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-11-20
1994-02-15
Pascal, Robert J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
052870715
ABSTRACT:
A differential amplifier embodying the invention includes a differential stage whose total output current is sensed and whose "tail" and output current is maintained relatively constant over a large common mode voltage range by means of a current feedback loop. This feature eenables the differential amplifier to accurately amplify low amplitude signals riding on a very large common mode signal. The tail current to the differential amplifier is supplied by a controllable current source. The tail current flows via two differentially connected transistors in two differential output terminals and is divided between them as a function of the voltage applied to two differential signal input terminals. The amplitude of the tail current is set by a current level setting current source connected to a summing node. An amplifier and current mirroring network is connected between the summing node and the controllable current source. A current sensing and mirroring network is connected to the two differential outputs for sensing the total current flowing and feeding back a current proportional thereto to the summing node for maintaining the tail current relatively constant over wide variations in the voltage applied to the signal input terminals.
REFERENCES:
patent: 5187448 (1993-02-01), Brooks et al.
Olmstead John A.
Vulih Salomon
Dudek James
Harris Corporation
Pascal Robert J.
Romano Fred
Schanzer Henry I.
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