Bias circuit having process variation compensation and power sup

Details Bias circuit having process variation compensation and power sup Bias circuit having process variation compensation and power sup

1996-11-06

1998-08-11

Hecker, Stuart N.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323315, G05F 304

Patent

active

057931941

ABSTRACT:
Bias networks for producing a predetermined bias current for another circuit are provided. The bias networks include compensation subcircuits which provide compensation for process variations in the transistors in the network. Circuit implementations which allow for compensation for power supply voltage variations are also provided. The bias networks include a biasing transistor and a corresponding compensation transistor on the same chip which compensation transistor will have substantially the same process variations as the biasing transistor. The compensation transistor is interposed at a node in a control path and draws current at the node such that a change in the current drawn by the compensation transistor causes a change in the input voltage of the biasing transistor to thereby adjust the bias current produced by the transistor to maintain the bias current within design specifications despite process variations. Bias circuit configurations for a cascode amplifier, a differential amplifier, and a current mirror are provided.

REFERENCES:
patent: 4814686 (1989-03-01), Watanabe
patent: 5297093 (1994-03-01), Coffman
patent: 5365127 (1994-11-01), Manley
patent: 5587655 (1996-12-01), Oyabe et al.
patent: 5617056 (1997-04-01), Main et al.

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