Switchable impedance circuit

Details Switchable impedance circuit Switchable impedance circuit

1994-02-03

1995-06-13

Gensler, Paul

Wave transmission lines and networks

Coupling networks

With impedance matching

330286, 327208, H03H 1128

Patent

active

054246920

ABSTRACT:
A switchable impedance circuit and method for maintaining a controlled signal line (e.g. RF transmission line) impedance at a circuit node includes a circuit and method for connecting a switchable impedance in shunt or series, or in a shunt and series combination. The switchable impedance can be selectively switched, e.g. "on" or "off", when the circuit is being powered up or down, or both, so as to maintain the desired, e.g. characteristic, impedance at the node of the signal line to which it is connected, for example by providing the complex conjugate of, or vectorially matching, any complex impedance present at such node, thereby advantageously helping to minimize undesirable transient signal effects, such as circuit ringing or oscillator frequency pulling.

REFERENCES:
patent: 4345171 (1982-08-01), Harris, Jr.
patent: 5272722 (1993-12-01), Tran
patent: 5309124 (1994-05-01), Cazaux et al.

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