Amplifier including circuit for reducing input capacitance

Details Amplifier including circuit for reducing input capacitance Amplifier including circuit for reducing input capacitance

1994-03-31

1996-02-20

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330292, H03F 345, H03F 114

Patent

active

054932548

ABSTRACT:
The input capacitance of a differential amplifier is reduced by connecting a positive feedback path between the collector of each input transistor and a terminal of a resistor connected in the other parallel current path. The positive feedback paths cause the voltage at the collector of each input transistor to move in the same direction as the voltage at the base of that input transistor, and thereby reduce the effective input capacitance seen at the input terminals of the differential amplifier.

REFERENCES:
patent: 4418321 (1983-11-01), Bohme
patent: 4769616 (1988-09-01), Barbu
patent: 5091701 (1992-02-01), Butler
T. Ngo et al., "A Low-Power 3V-5.5V Read/Write Preamplifier for Rigid-Disk Drives", IEEE International Solid-State Circuits Conference, Feb. 18, 1994, pp. 286-287.

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