Variable trap circuit

Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters

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333176, H03H 706

Patent

active

058413294

ABSTRACT:
In a trap circuit of the bridged-T type, having a delta RC circuit (RR, C1, C2) and a parallel resonant circuit (L, Cp), the capacitance Cp is constituted by variable capacitance diodes (D1, D2) connected via a resistor (8) to a control voltage (Vtone), and the resistor (RR) of the bridged-T circuit is constituted by a PIN diode whose current is controlled by the same control voltage (Vtone) via a resistor (9).

REFERENCES:
patent: 4417220 (1983-11-01), Holyman et al.
patent: 4795990 (1989-01-01), Ishikawa et al.
patent: 5392011 (1995-02-01), Li

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