Transconductor circuit

Details Transconductor circuit Transconductor circuit

2011-01-25

2011-01-25

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S295000, C330S12400D, C330S009000

Reexamination Certificate

active

07876153

ABSTRACT:
A transconductor circuit, particularly according to the multi-tanh principle, having a first input node and a second input node, a first differential amplifier coupled to the first and second input nodes, and having a first offset voltage, and a second differential amplifier coupled to the first and second input nodes, and having a second offset voltage different from the first offset voltage. A first resistance circuit is coupled between the first differential amplifier and at least one current source, and a second resistance circuit is coupled between the second differential amplifier and the at least one current source. Varying of the current sources enables control of the transconductance without degrading linearity.

REFERENCES:
patent: 5708391 (1998-01-01), Altmann et al.
patent: 5859606 (1999-01-01), Schrader et al.
patent: 5936465 (1999-08-01), Kimura
patent: 6437630 (2002-08-01), Gilbert
patent: 6549057 (2003-04-01), Gilbert
patent: 6771124 (2004-08-01), Ezell
patent: 7443226 (2008-10-01), Holloway et al.
Barrie, “The Multi-tanh Principle: A Tutorial Overview,” IEEE Journal of Solid-State Circuits, 3(1):2-17, Jan. 1998.

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