Communications: electrical – Continuously variable indicating – With meter reading
Patent
1991-04-01
1991-12-17
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082591, H04B 300
Patent
active
050737759
ABSTRACT:
A crosspoint matrix has matrix input lines which lead via pairs of switching elements to matrix output lines having, respectively, two signal conductors which are respectively connectible to a reference potential source via a precharging transistor controlled by a precharging clock and which have signal inputs of differential amplifier with a trigger behavior connectible thereto. The pair of switching elements respectively comprise two input transistors that have their control electrodes connected to a signal conductor of the appertaining matrix input line and form a series circuit with a respective switching transistor leading to the one or, respectively, other output signal conductor, a logic element that is respectively oppositely controlled by the precharging clock is inserted into the input lines and, in the switching elements, the ends of the series circuits facing away from the matrix output line are directly connected to the appertaining terminal of the operating voltage source.
REFERENCES:
patent: 4004284 (1977-01-01), Heeren
patent: 4897645 (1990-01-01), Hofmann
patent: 4949086 (1990-08-01), Hofmann
patent: 4998101 (1991-03-01), Trumpp et al.
Shin et al., "A 250-Bit/s CMOS Crosspoint Switch", IEEE Journal of Solid-State Circuits, vol. 24, No. 2, 1989, pp. 478-486.
Magistre Dervis
Siemens Aktiengesellschaft
Yusko Donald J.
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