Current-mode bidirectional input/output buffer

Details Current-mode bidirectional input/output buffer Current-mode bidirectional input/output buffer

1998-03-27

2000-06-13

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 82, 326 83, H03K 190175

Patent

active

060753846

ABSTRACT:
A bidirectional input/output buffer operates in a current mode to increase the data transfer rate between devices connected by a bidirectional transmission line. The buffer includes an output current source for generating an output current responsive to a data output signal. The output current is combined with an output current indicative of a data input signal received from another device over a transmission line, thereby forming a mixed current signal. The data input signal is restored from the mixed signal by a restoring circuit that compares the mixed signal to a reference current that depends on the value of the data output signal. The restoring circuit includes a current mirror and a reference current source that generates a reference current in response to the data output signal. To provide additional performance, an embodiment of a bidirectional input/output buffer utilizes a switchless structure having two comparators that compare the mixed signal to two different reference signals, thereby generating two comparison signals. A selector circuit selects one of the two comparison signals as the restored data input signal responsive to the data output signal.

REFERENCES:
patent: 5587709 (1996-12-01), Jeong
patent: 5604450 (1997-02-01), Borkar et al.

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