Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1998-04-01
2000-02-29
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
327562, 330261, G06G 712
Patent
active
060314176
ABSTRACT:
A switchable biasing device for an analog CMOS differential amplifier provides a supply bias current and a corresponding input bias voltage to achieve reliable performance with various power supply voltages. The bias device may include a control element having states corresponding to power supply voltages. The control element controls a supply bias circuit for supplying bias current to a differential amplifier at a level corresponding to the power supply voltage represented by a control signal from the control element. The bias current is made lower for a low power supply voltage to ensure that current source stage elements of the differential amplifier operate within their saturation region, and higher for a high power supply voltage to ensure sufficient current to maintain slew rates. The control element further controls an input bias circuit for providing a dc bias voltage at inputs of the differential amplifier at levels corresponding to the power supply voltage represented by the control signal. The control element thereby operates to select a supply bias current and input bias voltage that are appropriate for the power supply voltage.
REFERENCES:
patent: 5512857 (1996-04-01), Koskowich
patent: 5550510 (1996-08-01), Nagaraj
patent: 5561396 (1996-10-01), Hogervorst et al.
patent: 5602509 (1997-02-01), Kimura
patent: 5610557 (1997-03-01), Jett, Jr.
Callahan Timothy P.
Eppele Kyle
Luu An T.
O'Shaughnessy James P.
Rockwell International
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