Amplifier circuit

Details Amplifier circuit Amplifier circuit

2007-11-13

2007-11-13

Pert, Evan (Department: 2826)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

11197376

ABSTRACT:
An amplifier circuit includes a first differential amplifier circuit, a second differential amplifier circuit which amplifies an output signal from the first differential amplifier circuit, and an active feedback circuit which performs waveform shaping on the output signal from the first differential amplifier circuit by feeding back an output signal from the second differential amplifier circuit. The active feedback circuit includes first and second transistors having collectors or drains respectively connected to respective output nodes of the first differential amplifier circuit, bases or gates respectively connected to two output nodes of the second differential amplifier circuit, and emitters or sources connected in common, and a first current source which has a first end connected to the emitters or sources of the first and second transistors, and a second end connected to a low-voltage power supply, and producing a current that can be externally adjusted.

REFERENCES:
patent: 4542350 (1985-09-01), Akazawa et al.
patent: 5355094 (1994-10-01), Soda
patent: 6831510 (2004-12-01), Jiang
patent: 59-016404 (1984-01-01), None
patent: 61-281710 (1986-12-01), None
patent: 01-137713 (1989-05-01), None
patent: 05-299949 (1993-11-01), None
Todd “FETs as voltage-variable resistors” Application Notes vol. 13, No. 19, Sep. 13, 1965, pp. 66-68.
Sherif Galal et al., “10-Gb/s Limiting Amplifier and Laser/Modulator Driver in 0.18-μm CMOS Technology”, IEEE Journal of Solid-State Circuits, vol. 38, No. 12, Dec. 2003, pp. 2138-2146.

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