Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Converging with plural inputs and single output
Patent
1996-10-24
1999-09-21
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Converging with plural inputs and single output
327404, 326113, H03K 1762
Patent
active
059559128
ABSTRACT:
A multiplexer has first, second, third and fourth inputs receiving respective first, second, third and fourth input signals, having first and second control inputs receiving respective first and second select input signals and an output. Each of the four input signals is supplied to the input of a CMOS transmission gate. The first and second transmission gates are clocked via the first select signal and its inverse in a first phase. The third and fourth transmission gates are clocked via the first select signal and its inverse in a second phase, opposite to the first phase. A first embodiment includes a first intermediate inverter having an input connected jointly to the outputs of the first and second transmission gates and a second intermediate inverter having an input connected jointly to the outputs of the third and fourth transmission gates. The multiplexer output is provides by a fifth and a sixth transmission gate oppositely clocked via the second control signal input and coupled to the first and second intermediate inverters, respectively. A second embodiment employs double pass logic in place of the fifth and sixth transmission gates and an output inverter. A third embodiment employs two oppositely clocked tristate inverters for output. A fourth embodiment employs N-type MOSFETs instead of transmission gates. A P-type MOSFET provides feedback to an output inverter to reduce possible static power dissipation.
REFERENCES:
patent: 5162666 (1992-11-01), Tran
patent: 5233233 (1993-08-01), Inoue et al.
patent: 5744995 (1998-04-01), Young
Donaldson Richard L.
Laws Gerald E.
Marshall, Jr. Robert D.
Texas Instruments Incorporated
Wells Kenneth B.
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