Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-11-18
1999-08-10
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327509, 327530, 327538, 323312, 323315, G05F 110
Patent
active
059364602
ABSTRACT:
The present invention comprises a noise insensitive current source circuit having a high power supply rejection ratio. The circuit of the present invention is for use with noise sensitive circuits. The circuit of the present invention includes a first reference current source, a second reference current source, and a first, second, third, and fourth transistor. The first transistor has a drain coupled to a power supply and a source coupled to a ground via the first reference current. The second transistor has a drain coupled to the power supply and a source coupled to ground via the second reference current source. The gate of the second transistor is coupled to the gate of the first transistor and to the source of the first transistor. A third transistor has a drain coupled to the power supply and a source coupled to ground via the second reference current source. The gate of the third transistor is coupled to the source of the second transistor. The fourth transistor has a drain coupled to the power supply and a source adapted to coupled to a noise sensitive circuit. The gate of the fourth transistor is coupled to the gate of the third transistor such that the noise sensitive circuit receives a current from the power supply via the fourth transistor and the noise insensitive current source effects a high power supply rejection ratio.
REFERENCES:
patent: 4461991 (1984-07-01), Smith
patent: 4567426 (1986-01-01), Van De Plassche et al.
patent: 5059890 (1991-10-01), Yoshikawa et al.
patent: 5512816 (1996-04-01), Lambert
patent: 5594382 (1997-01-01), Kato et al.
patent: 5777509 (1998-07-01), Gasparik
Callahan Timothy P.
Kim Jung Ho
VLSI Technology Inc.
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