Circuit for neutralizing thermal drift in a transconductance sta

Details Circuit for neutralizing thermal drift in a transconductance sta Circuit for neutralizing thermal drift in a transconductance sta

1992-11-25

1994-11-15

Sikes, William L.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330256, 330300, H03F 345

Patent

active

053651936

ABSTRACT:
A circuit device for neutralizing thermal drift in a transconductor differential stage using a first circuit portion which corresponds structurally to the transconductor differential stage and has a pair of MOS input transistors defining a transconductance value which is substantially proportional to that of the transconductor differential stage, a pair of bipolar output transistors coupled to the MOS input transistors in a cascode configuration, and a second circuit portion being supplied a current from an output of the first differential portion to thereby output a current to be passed to the transconductor differential stage. The value of the output current is inversely proportional to temperature-dependent parameters of the transconductance.

REFERENCES:
patent: 4301421 (1981-11-01), Yokoyama
patent: 4388539 (1983-06-01), Boeke
patent: 4618833 (1986-10-01), Russell
patent: 4887048 (1989-12-01), Krenik et al.
patent: 4897613 (1993-07-01), Rao et al.

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