Electrical transmission or interconnection systems – Switching systems
Patent
1985-09-30
1987-07-07
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
307146, 307154, 307243, 307241, 3581941, 358181, 328104, H01H 6336, H04N 522
Patent
active
046789294
ABSTRACT:
In a radio frequency switch, a pair of diodes is coupled in series with polarities opposed between input and output ports. A shunt diode is coupled between the junction point of the pair of diodes and a point of reference potential. A transistor has its main conduction path coupled between the junction point and the point of reference potential. When the switch is to couple a signal between the input and output ports, a control arrangement applies bias tending to forward bias the pair of diodes, to reverse bias the shunt diode and cut off conduction through the transistor. When the switch is not to couple a signal, the control arrangement applies bias tending to reverse bias the pair of diodes, forward bias the shunt diode, and to bias the transistor into a highly conductive condition, thereby further reducing any difference of potential between the junction point and the point of AC reference potential and cooperating with the bias potential tending to forward bias the shunt diode and reverse bias the pair of diodes. In another embodiment, one diode of the pair of diodes is coupled to the junction point by way of a low-pass filter which does not substantially affect a signal to be coupled but exhibits a high series impedance which increases the attenuation when the switch is not to couple a signal.
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U.S. Application Ser. No. 535,707, filed 9/26/83-Tamer et al., "Single-Pole Multi-Throw Signal Switch for Modular Audio-Visual Systems".
Article by R. C. Gerdes, p. 73, High-Level Analog Switch.
National Semiconductor Corporation "Linear Applications Handbook", bearing cover date 1978, p. AN32-12 of Application Note 32, dated 1970, on p. AN32-1.
Alpaiwalla Feroz K.
Begeman Robert H.
Ahmed Adel A.
Emanuel Peter M.
Ip Shik Luen Paul
Rasmussen Paul J.
RCA Corporation
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