Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-03-16
1988-05-24
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307443, 307451, 307570, H03K 1704, H03K 1901
Patent
active
047468173
ABSTRACT:
A BIFET logic circuit for quickly switching an output line from a high level to a reference level. The BICMOS circuit comprises a push-pull circuit including a first bipolar transistor for driving current into an output line, and a second bipolar transistor for sinking current from the output line; a CFET logic circuit for performing a logic function and including at least one N type FET for providing current to the base of the second bipolar transistor when a set of input lines to the CFET circuit has a first set of predetermined values; and a resistive means for connecting one of the source or drain of the at least one NFET to a power supply to provide a source of base current to the second bipolar transistor, even when the output line drops in voltage. This circuit is especially advantageous for driving low threshold CFET circuits. In a preferred embodiment, the circuit further includes a device for preventing a voltage differential of more than a predetermined amount between the base and emitter of the first bipolar transistor, to thereby ensure proper push-pull operation of the bipolar transistors.
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Banker Dennis C.
Dansky Allan H.
Dorler Jack A.
Klara Walter S.
Masci Frank M.
Ellis William T.
Hudspeth D. R.
International Business Machines - Corporation
Miller Stanley D.
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