Apparatus and method for transconductance stage with high...

Details Apparatus and method for transconductance stage with high... Apparatus and method for transconductance stage with high...

2007-06-19

2007-06-19

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S066000

Reexamination Certificate

active

11171957

ABSTRACT:
A transconductance stage is provided. The transconductance stage includes a tail current source, a differential pair, and two current mirrors. The input to each of the current mirrors is connected to the drain of a separate one of the transistors in the differential pair. The two current mirrors each have two outputs so that one of the outputs can be used to determine whether the output current exceeds a threshold (e.g. nine-tenths of the tail current). If the source current exceeds the threshold, extra source current is switched in to the output so that output source current is increased. Similarly, if the sink current exceeds the threshold, extra sink current is switched in to the output so that the output sink current is increased. This way, the transconductance stage can supply large output currents in response to a large signal input but maintains low quiescent current for small input signals.

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Stanislaw Szczepanski, “VHF Fully-Differential Linearized CMOS Transconductance Element and Its Applications,” IEEE International Symposium on Circuits and Systems, ISCAS 1994, vol. 5, pp. 97-100.

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