Voltage-controlled current source and frequency scanner...

Details Voltage-controlled current source and frequency scanner... Voltage-controlled current source and frequency scanner...

2006-10-30

2008-11-04

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S548000, C327S147000

Reexamination Certificate

active

07446597

ABSTRACT:
A voltage-controlled current source and a frequency scanner using the same are provided. The voltage-controlled current source includes an impedance circuit, an amplifier, a transistor, and a current mirror. A first terminal of the impedance circuit is coupled to a common voltage. A first terminal of the amplifier is coupled to a second terminal of the impedance circuit, and a second terminal of the amplifier receives a control voltage. A gate of the transistor is coupled to an output terminal of the amplifier, and a first source/drain of the transistor is coupled to the other terminal of the impedance circuit. The current mirror is coupled to a second drain/source of the transistor, and includes a current output terminal, wherein a current output by the current output terminal is proportional to the current flowing through the transistor.

REFERENCES:
patent: 4705961 (1987-11-01), Ainsworth et al.
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 5815039 (1998-09-01), Kimura
patent: 6680656 (2004-01-01), Chen
patent: 6856204 (2005-02-01), Kwon
patent: 7253691 (2007-08-01), Okada
patent: 2003/0222722 (2003-12-01), Kwon
patent: 2004/0051591 (2004-03-01), Okada

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