CMOS controlled-impedance transmission line driver

Details CMOS controlled-impedance transmission line driver CMOS controlled-impedance transmission line driver

2005-06-21

2005-06-21

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S563000, C327S065000

Reexamination Certificate

active

06909310

ABSTRACT:
A line driver fabricated from CMOS devices that provides a substantially constant output impedance over a significant range of a time-varying input voltage includes a time-varying current source, a pair of CMOS output loads, and a pair of biasing circuits. Each CMOS output load includes a NMOS transistor and a PMOS transistor connected in parallel and each biased into a linear range of operation. In response to a time-varying input voltage, the time-varying current source draws current from the pair of CMOS output loads in a manner that operates each CMOS output load to collectively establish a time-varying output voltage component at an associated output terminal.

REFERENCES:
patent: 4563654 (1986-01-01), Arai et al.
patent: 4622521 (1986-11-01), Redfern
patent: 5442309 (1995-08-01), Cabler
patent: 5821809 (1998-10-01), Boerstler et al.
patent: 6570436 (2003-05-01), Kronmueller et al.

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