Current source having voltage stabilizing element

Details Current source having voltage stabilizing element Current source having voltage stabilizing element

1995-01-20

1996-08-13

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331143, 331173, 331175, 331177R, 327103, 327182, H03B 524, G05F 316, H03K 3011, H03K 303

Patent

active

055460542

ABSTRACT:
A current source including a current mirror circuit and an active load circuit which form a reference branch, for setting a reference current value, and a mirroring branch, defining an output current value, connected between supply and ground. A voltage stabilizing transistor is interposed between the current mirror circuit and the load circuit in the reference branch only, and is so biased as to maintain its gate terminal at a predetermined voltage. As such, the potential with respect to ground of the drain terminal of the reference branch load transistor is fixed, so that its drain-source voltage drop (and the current through it) is substantially independent of supply voltage. The current source may be used to advantage in an oscillator for generating the: clock signal of a nonvolatile memory.

REFERENCES:
patent: 4714901 (1987-12-01), Jain et al.
patent: 4723114 (1988-02-01), D'Arrigo et al.
patent: 5070311 (1991-12-01), Nicolai
patent: 5233315 (1993-08-01), Verhoeven
patent: 5341113 (1994-08-01), Baron et al.
patent: 5440277 (1995-08-01), Ewen et al.
J. F. Duque-Carrillo et al., "A Family of Bias Circuits for High Input Swing CMOS Operational Amplifiers", 1992 IEEE International Symposium On Circuits and Systems, vol. 6, pp. 3021-3024, 1992.

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