Critically-biased MOS current mirror

Details Critically-biased MOS current mirror Critically-biased MOS current mirror

1997-01-29

1999-02-02

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323315, H03F 316

Patent

active

058670670

ABSTRACT:
The input branch of the current mirror is responsive to a single input signal current and each output branch of the current mirror mirrors the input signal current to produce an output current proportional to (e.g., substantially equal to) the input signal current. In one embodiment, the input branch has an input mirror MOS transistor connected to a threshold voltage generator, the output branch has an output mirror MOS transistor connected in cascode to an output cascode MOS transistor, and all of the transistors operate in saturation. The threshold voltage generator may be implemented in different ways, including using four MOS transistors forming two current paths, such that, in one current path, two transistors have channel constants of X and 4X, respectively, and, in another current path, two transistors both have channel constants of A, which may be different from X. In this implementation, the input and output mirror transistors have channel constants of B, which may be different from X and A, and the output cascode transistor has a channel constant of 4X+A.

REFERENCES:
patent: 3936725 (1976-02-01), Schneider
patent: 4471292 (1984-09-01), Schenck et al.
patent: 4477782 (1984-10-01), Swanson
patent: 4550284 (1985-10-01), Sooch
patent: 4983929 (1991-01-01), Real et al.
patent: 5386200 (1995-01-01), Limberg

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