Active tunable filter circuit

Details Active tunable filter circuit Active tunable filter circuit

2007-10-30

2007-10-30

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S340000, C330S292000

Reexamination Certificate

active

10238796

ABSTRACT:
An active tunable filter circuit for use as an integratable active filter in a mobile radio apparatus, comprises an active amplifier circuit (A) including a reactive feedback network including a first tunable element (L1) set to pass with amplification a wanted input signal, and a passive resonant circuit (P) coupled to the active amplifier circuit and including an inductive element (LFB, L3or L4) and an inactive semiconductor element (FET2, FET3or FET4) having an interelectrode capacitance which in operation resonates with the inductive element at a harmonic of the wanted signal. In one configuration (FIG.1) the circuit comprises a band pass filter with amplification and in another configuration (FIG.6-not shown) the circuit comprises a harmonic notch filter with amplification.

REFERENCES:
patent: 3849677 (1974-11-01), Stacey et al.
patent: 4404686 (1983-09-01), Moon
patent: 4408348 (1983-10-01), Theriault
patent: 5159287 (1992-10-01), Furutani et al.
patent: 5280638 (1994-01-01), Porambo et al.
patent: 5325019 (1994-06-01), Miller et al.
patent: 6232847 (2001-05-01), Marcy et al.
patent: 6417740 (2002-07-01), Anh et al.
patent: 6509799 (2003-01-01), Franca-Neto
patent: 6573788 (2003-06-01), Oppelt
patent: 6624484 (2003-09-01), Christensen
patent: 6819941 (2004-11-01), Dening et al.
patent: 2001/0008383 (2001-07-01), Nishida et al.

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