Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-10-05
2000-09-26
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, 323312, 323313, G05F 302
Patent
active
061247537
ABSTRACT:
A current source for providing matched currents at low and variable bias voltages. The current source includes a first circuit, a second circuit, and a biasing circuit. The first circuit provides a first current. The first circuit includes a first transistor with a control terminal, a first terminal, and second terminal. A second circuit provides an output current to an output node. The second circuit includes a second transistor with a control terminal, a first terminal, and second terminal. The biasing circuit includes a third transistor with a control terminal, a first terminal, and second terminal. The biasing circuit also includes a fourth transistor with a control terminal, a first terminal, and second terminal. The biasing circuit provides a voltage at the first terminal of the third transistor and a voltage at the control terminal of the second transistor so that a voltage at the first terminal of the second transistor and a voltage at the second terminal of the first transistor match. Thereby, the first current and output current approximately match.
REFERENCES:
patent: 4897596 (1990-01-01), Hughes et al.
patent: 5337001 (1994-08-01), French et al.
patent: 5532579 (1996-07-01), Park
patent: 5570008 (1996-10-01), Goetz
patent: 5594382 (1997-01-01), Kato et al.
patent: 5633612 (1997-05-01), Lee
patent: 5874852 (1999-02-01), Brambilla et al.
patent: 5955874 (1999-09-01), Zhou et al.
Callahan Timothy P.
Kwok Edward C.
Luu An T.
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