Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By separating composite signal
Patent
1996-12-24
1999-02-16
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By separating composite signal
327 68, 326 30, 326 86, H03K 1700
Patent
active
058724710
ABSTRACT:
In a simultaneous bidirectional transmission circuit for conducting simultaneous two-way communication between LSIs via a transmission line, an input/output circuit connected to the transmission line is included in an LSI. The input/output circuit has a driver and a receiver. The driver sends out an output signal depending on a logical signal within the LSI to the transmission line. The receiver receives a mixed signal having a mixture of a received signal and the output signal via the transmission line. The signal to be received by the receiver in an LSI has been sent out to the transmission line by the other party i.e., another LSI in communication therewith. The receiver receives the logical signal output as well. The receives derives a difference between the mixed signal and the logical signal output, thereby removing the component of the logical signal from the mixed signal, and outputs the received signal. The receiver has a reference circuit for receiving the logical signal and outputting it to a bias circuit, a bias circuit for generating a divided voltage signal in conjunction with internal resistance of the reference circuit, and a differential receiver for receiving the mixed signal and the divided voltage signal and outputting the difference between them. The reference circuit and the bias circuit are formed by using MOS transistors.
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T. Takahaski, et al., "A CMOS Gate Array with 600Mb/s Simultaneous Bidirectional I/O Circuits", IEEE-ISSCC Digest of Technical Papers, Feb., 1995, pp. 40-41.
Aida Tatsuhiro
Goto Tsutomu
Hayashi Takehisa
Ishibashi Kenichi
Takahashi Toshiro
Callahan Timothy P.
Hitachi , Ltd.
Kim Jung Ho
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