High-speed low-voltage differential swing transmission line tran

Details High-speed low-voltage differential swing transmission line tran High-speed low-voltage differential swing transmission line tran

1993-04-15

1995-11-28

O'Shea, Sandra L.

Pulse or digital communications

Transmitters

375296, 375316, 330310, H04L 2704, H04L 102, H03K 900, H03F 304

Patent

active

054714982

ABSTRACT:
A data transceiver includes a transmitter connected at one end of a data transmission line and a receiver connected at the other end of the data transmission line. At least some portions of the transceiver are formed in CMOS. A temperature compensation circuit is connected to selected components of the transceiver to correct for temperature-induced variations in currents through those components. The temperature compensation circuit includes a pair of transistors connected, respectively, in parallel conduction paths. The respective width-to-length ratios of the channels of the transistors are unequal, and their gates are tied together. The current through the larger transistor varies directly with temperature, and this current is reflected in a current mirror transistor that is connected to the shorted gates of the transistor pair. Since in CMOS technology current varies inversely with temperature, the current through the mirror transistor can be used as a means of providing temperature compensation for selected components of the transceiver.

REFERENCES:
patent: 3899754 (1975-08-01), Brolin
patent: 4630284 (1986-12-01), Cooperman
patent: 5111080 (1992-05-01), Mizukami et al.
patent: 5144405 (1992-09-01), Naber
patent: 5287386 (1994-02-01), Wade
IBM Technical Disclosure Bulletin, "Single-ended Receiver with Orthogonal Only Outputs", vol. 35, No. 1B, Jun. 1992, New York, US, pp. 199-201.

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