Start circuit for a self-biasing constant current circuit, const

Details Start circuit for a self-biasing constant current circuit, const Start circuit for a self-biasing constant current circuit, const

1997-11-13

1999-12-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327540, 327541, G05F 110

Patent

active

060022949

ABSTRACT:
There are provided a start circuit for a constant current circuit, a constant current circuit including the start circuit, and an operational amplifier including the constant current circuit. When an output stop signal PD changes from an inactivation mode to an activation mode, changes of transistors MN3 and MP6 to their off states are delayed for a moment by a delay circuit DL or a switch SW1 to temporarily lower the bias node and to reliably start the circuit. Therefore, the circuit does not need a large capacitor and prevents entry of noise through the capacitor.

REFERENCES:
patent: 5034626 (1991-07-01), Pirez et al.
patent: 5744999 (1998-04-01), Kim et al.
patent: 5777504 (1998-07-01), Chu et al.
patent: 5825237 (1998-10-01), Ogawa

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