Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-11-25
1989-02-28
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307443, 307451, 307452, H03K 1716, H03K 19094, H03K 1902
Patent
active
048088536
ABSTRACT:
A tristate output circuit includes a pair of transistors having sources connected to a switchable current source and drains separately coupled to a voltage source through separate resistors and switching transistors. When the current source and switching transistors are on, the circuit operates in a back termination mode wherein it amplifies a differential input signal applied across the gates of the transistor pair to produce a differential output signal across their drains for transmission on a transmission line. The load resistors are sized to match the characteristic impedance of a transmission line so as to properly terminate the transmission line. In an open drain mode, the switching transistors are off, uncoupling the drains of the transistor pair from the voltage source so as to increase output impedance. In a tristate mode, the current source and switching transistors are turned off, thereby turning off the transistor pair and rendering the output impedance of the circuit substantially infinite.
REFERENCES:
patent: 4644196 (1988-08-01), Flannagan
Bedell Daniel J.
Lovell William S.
Meza Peter J.
Triquint Semiconductor, Inc.
Wambach M. R.
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