Tunable notch filter for image frequency and conducted local osc

Details Tunable notch filter for image frequency and conducted local osc Tunable notch filter for image frequency and conducted local osc

1985-08-15

1987-04-28

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

455285, 455302, 455197, 333176, H04B 126

Patent

active

046620010

ABSTRACT:
A tunable notch filter for the front end of an RF receiver includes magnetically coupled input and output tunable stages each responsive to a tuning voltage provided thereto. Each of the input and output stages includes a respective series and parallel resonant circuit wherein the parallel resonant circuits are tuned to a selected RF frequency and the series resonant circuits are tuned to a frequency approximately equal to that of a local oscillator. By using the series resonant circuits to create a notch at a frequency approximating that of the local oscillator, conducted local oscillator leakage from the receiver's antenna is substantially reduced and local oscillator image frequency rejection is substantially improved.

REFERENCES:
patent: 3207990 (1965-09-01), Nestlerode
patent: 3372337 (1968-03-01), Beres
patent: 3571767 (1971-03-01), Bush, III
patent: 4291290 (1981-09-01), Ijichi et al.
patent: 4361909 (1982-11-01), Theriault
patent: 4601062 (1986-07-01), Hettiger

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