Communications: electrical – Continuously variable indicating – With meter reading
Patent
1991-12-11
1994-02-08
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082587, 34082502, H04Q 100
Patent
active
052852024
ABSTRACT:
A broadband space switch matrix constructed from a plurality of NAND gates arranged into a set of cascaded stages to form a tree-switch multiplexing configuration. A plurality of input digital signals are applied to input ports coupled to the NAND gates in the first stage. A selected one of the input signals emerges as an output signal from an output port coupled to a single NAND gate in the last stage. Each NAND gate has a select line for receiving control signals. The switching path for the selected input signal is established by placing the sequence of NAND gates defined by the selected switching path in a state of conduction whereby only the selected input signal propagates through the switch. This is effected by forcing to a HIGH state the particular NAND gates in each stage whose outputs are coupled to the same NAND gate in the following stage along with the output of the NAND gate in the current stage which is in the chosen path. The forced HIGH state is achieved by applying a LOW state signal to the respective select lines of the particular NAND gates. In an alternate arrangement, the NAND gates in the first stage are replaced by 2:1 pass-transistor-selectors which offer a reduction in the number of transistors.
REFERENCES:
patent: 3614327 (1971-10-01), Low
patent: 4197428 (1980-04-01), Semur
patent: 4453096 (1984-06-01), Le Can et al.
patent: 4481623 (1984-11-01), Clark
patent: 4593390 (1986-06-01), Hildebrand et al.
patent: 4813043 (1989-03-01), Reyneri
patent: 4818988 (1989-04-01), Cooperman et al.
patent: 4849751 (1989-07-01), Barber et al.
patent: 4970507 (1990-11-01), Cooperman et al.
patent: 5049877 (1991-09-01), Cooperman et al.
Panzer et al., "Picture transmission path . . . subscriber network," Frequenz, vol. 38, No. 9, 1984, pp. 217-223.
Suzuki et al., "A Circuit Design for . . . Switch LSI's," IEEE J. of Solid-State Circuits, vol. 25, No. 1, pp. 155-159 (1990).
IBM Tech. Disclosure Bull. "CMOS Self-Decoding Complementary Pass-Gate Multiplexer", vol. 28, No. 3 (Aug. 1985) pp. 1302-1303.
"Logic Design", Holdsworth et al., Wireless World, vol. 84, No. 1507, (Mar. 1978), pp. 47-50.
N. H. E. Weste et al., "CMOS Circuit and Logic Design," Prin. of CMOS VLSI Design, pp. 172-203 (1985).
Pasternak et al., "CMOS Differential Pass-Transistor Logic Design", IEEE Journal of Solid State Circuits, vol. SC-22 No. 2, pp. 216-222 (1987) Apr.
Hayano et al., "GaAs 8.times.8 Matrix Switch LSI for High-Speed Digital Communications," IEEE Gallium Arsenide IC Symposium, pp. 245-248 (Oct. 1987).
S, Whitaker, "Pass-Transistor Networks Optimize n-MOS Logic", Elec., vol. 56, No. 19, pp. 144-148 (Sep. 1983).
F. E. Barber et al., "Session IX: Telecommunication Circuits" IEEE Intl. Solid-State Circuits Conf. 1988 pp. 116-117.
Cooperman Michael
Paige Arnold
Sieber Richard W.
GTE Laboratories Incorporated
Holloway III Edwin C.
Lohmann, III Victor F.
Yusko Donald J.
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