Tunable input trap circuit and image trap circuit
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United States of America Patent
Stats
-
Oct 29, 2002
Grant Date -
Sep 19, 2002
app pub date -
May 24, 2000
filing date -
May 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An input trap circuit removes a predetermined frequency component included in an input signal and then outputs the input signal to a circuit at a later stage. The input trap circuit is provided with: a parallel oscillation circuit in which a pair of variable capacitance diodes are connected in series such that cathodes thereof are connected to each other at a junction portion and in which an inductance is connected in parallel to the variable capacitance diodes between anodes of the variable capacitance diodes at both ends thereof; a voltage applying device for applying a voltage to the junction portion so as to vary capacitance values of the variable capacitance diodes on the basis of reverse voltage characteristics of the variable capacitance diodes respectively; and a variable capacitor element connected between the junction portion and a ground.
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