CMOS low-power, wide-linear-range, well-input differential and t

Details CMOS low-power, wide-linear-range, well-input differential and t CMOS low-power, wide-linear-range, well-input differential and t

1994-07-27

1995-10-31

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330260, 330307, H03F 345

Patent

active

054633486

ABSTRACT:
A novel family of CMOS differential and transconductance amplifiers has wide input linear range and is suited for low power operation. The wide linear range is obtained by "widening the tanh", or decreasing the ratio of transconductance to bias current, by combining the three techniques of (a) using the well terminals of the input differential-pair transistors as the amplifier inputs; (b) using the feedback technique known as source degeneration; and (c) using the novel feedback technique of gate degeneration. According to one preferred embodiment of the present invention a compact transconductance amplifier having a linear range of .+-.1 V was achieved in an 11-transistor circuit with a DC-input operating range of 1 V-5 V in a low-power subthreshold CMOS technology in a standard 2 micron process.

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