Variable gain transconductance amplifier and variable bandwidth

Details Variable gain transconductance amplifier and variable bandwidth Variable gain transconductance amplifier and variable bandwidth

1988-09-12

1989-11-14

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330107, 330294, 330306, H03F 345

Patent

active

048810436

ABSTRACT:
A variable gain transconductance amplifier wherein complimentary input followers are used in conjunction with the multiplier to provide a high input impedance. A pair of multiplier input devices are embedded in the input followers to reduce the supply voltage used by the multiplier and to improve signal handling capability while reducing the supply voltage required. Further, these variable gain transconductance amplifiers are used in active filters to provide adjustment of the bandwidth without affecting the center frequency.

REFERENCES:
patent: 4288754 (1981-09-01), Okada et al.
Voorman et al, "Integration of Analog Filters in a Bipolar Process" IEEE J. of Solid-State Circuits, vol. SC-17, No. 4, Aug. 1982, pp. 713-722.

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