Circuits and techniques for conditioning differential signals

Details Circuits and techniques for conditioning differential signals Circuits and techniques for conditioning differential signals

2006-01-10

2006-01-10

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C330S144000

Reexamination Certificate

active

06985021

ABSTRACT:
Circuitry is provided that conditions a differential input signal such that when the signal is received by a multi-standard differential input buffer, the buffer is able to process the conditioned signal without pronounced increases in propagation delay, thereby keeping signal jitter to a minimum. The circuitry further enables input buffers to operate according to desired operating parameters even when the supply voltage powering the input buffer is relatively low. The circuitry operates by shifting the common-mode voltage to a range that puts the input buffer in a favorable common-mode voltage range of operation. The circuitry may be coupled with a programmably controlled amplifier that amplifies the amplitude of the conditioned differential signal prior to being received by the input buffer. Amplifying the signal prevents problems typically associated with data-dependent jitter and intersymbol interference by boosting the voltage amplitude to a level that is readily processed by the input buffer.

REFERENCES:
patent: 3619800 (1971-11-01), Lyghounis et al.
patent: 4037170 (1977-07-01), Richards
patent: 4536888 (1985-08-01), Wilson
patent: 6590436 (2003-07-01), Jordanger et al.
patent: 6735302 (2004-05-01), Caine et al.

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