Trans-conductance amplification circuit, trans-conductance...

Details Trans-conductance amplification circuit, trans-conductance... Trans-conductance amplification circuit, trans-conductance...

2005-12-27

2005-12-27

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S051000

Reexamination Certificate

active

06980054

ABSTRACT:
A trans-conductance filter circuit with an expanded cut-off frequency range is provided. The cut-off frequency of a trans-conductance filter circuit is changed by varying the current mirror ratio of a current mirror circuit. This mirror ratio is varied by changing the output current of a constant current source, or by switching among the respective action states of multiple transistors the actions of which are invoked within constant current regions. The variable cut-off frequency range can be expanded without losing the constant current attributes of the transistors.

REFERENCES:
patent: 5563819 (1996-10-01), Nelson
patent: 5666086 (1997-09-01), Klein
patent: 6201379 (2001-03-01), MacQuigg et al.
patent: 6531921 (2003-03-01), Horie
patent: 6741130 (2004-05-01), Wey et al.

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