Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1996-08-26
1998-08-11
Hudspeth, David R.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
326 83, 326 86, H03K 1716
Patent
active
057932239
ABSTRACT:
A reference generation and switched current source system suitable to convey data signals over a transmission line with minimum reflection through the use of active termination, transmission line current biasing, and the use of a shared referenced voltage derived from the characteristic impedance of the line as refined by integrated circuit transistor parameters at the transmitter and receiver. The integrated circuit chips connected by the transmission line each have a reference generator which defines a bias voltage for an active terminator, a bias current for injection into the transmission line, and a switched current source. The reference node interconnecting the transmitting and receiving devices conveys a voltage nominally twice the voltage at which the transmission line is biased and nominally twice the voltage increase introduced by the switched current source. The switched current source at the transmitting end, the bias current provided at the transmitting end, and the bias level of the active terminator at the receiving end of a transmission line are derived directly from the voltage on the reference node while compensating for the unique characteristics of the integrated circuit transistors in the respective chips.
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Hudspeth David R.
International Business Machines - Corporation
Salys Casimer K.
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