Negative feedback circuit and method and apparatus for...

Details Negative feedback circuit and method and apparatus for... Negative feedback circuit and method and apparatus for...

2007-11-30

2009-02-24

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S086000, C327S109000

Reexamination Certificate

active

07495470

ABSTRACT:
A negative feedback circuit including: a voltage follower for making the output voltage follow a reference voltage, a proportional current mirror for outputting a current in proportion to a reference current via a reference resistor as a input current of the proportional current mirror, a comparison arbiter for comparing the voltage across the reference resistor and the voltage across a first variable resistor to acquire a regulating signal, inputting the regulating signal to the third regulating end of the first variable resistor and inputting the regulating signal to the third regulating end of a second variable resistor to synchronously regulate the resistances of the first and second variable resistors and thus make the resistances of the first and second variable resistors equal to the desired terminating resistance. The present invention also discloses a method and apparatus for performing on-chip impedance matching for a transmission line.

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patent: 4754233 (1988-06-01), Pickett
patent: 6222418 (2001-04-01), Gopinathan et al.
patent: 6731164 (2004-05-01), Johnston
patent: 6836142 (2004-12-01), Lesea et al.
patent: 6980020 (2005-12-01), Best et al.
patent: 7205787 (2007-04-01), Massoumi et al.
patent: 2005/0253645 (2005-11-01), North
patent: 05-152871 (1993-06-01), None
patent: 2001-267853 (2001-09-01), None

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