Linear low noise transconductance cell

Details Linear low noise transconductance cell Linear low noise transconductance cell

2006-02-21

2006-02-21

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

C330S253000

Reexamination Certificate

active

07002405

ABSTRACT:
A low noise transconductance cell includes a resistor and a differential circuit pair having two equivalent half-circuits. Each half-circuit includes a feedback loop coupled to the resistor. The feedback loop includes an input transistor coupled to an inverting gain stage. The inverting gain stage is coupled to an output transistor which in turn is coupled to the input transistor and the resistor. In a low noise transconductance cell, a bias current source is coupled to the center of series connected resistors. In a high swing transconductance cell, a first bias current source is coupled to the left terminal of a resistance stage and a second bias current source is coupled to the right terminal of the resistance stage. The resistance stage can include a single resistor or a plurality of resistors.

REFERENCES:
patent: 3356858 (1967-12-01), Wanlass
patent: 4080828 (1978-03-01), Akita et al.
patent: 5043652 (1991-08-01), Rybicki et al.
patent: 5179298 (1993-01-01), Hirano et al.
patent: 5682123 (1997-10-01), Chau
patent: 6552611 (2003-04-01), Yamamoto
patent: 6570447 (2003-05-01), Cyrusian et al.
patent: 6744319 (2004-06-01), Kim
patent: 6791415 (2004-09-01), Mitteregger

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