Bandpass filter with an active element

Details Bandpass filter with an active element Bandpass filter with an active element

1981-04-23

1983-10-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330 61A, 330294, 330305, 330311, H03F 3191

Patent

active

044095570

ABSTRACT:
An amplifier including an in phase feedback signal to therefore exhibit negative resistance is receptive of an input alternating signal which includes a frequency F. The output of the amplifier is coupled to a resonator adjusted to a center frequency F and having undesirable resistance which is offset by the negative resistance of the amplifier. The resonator includes an inductor and adjustable capacitor arranged either in series or in parallel with the amplifier to therefore change the value of F.

REFERENCES:
patent: 3401349 (1968-09-01), Mitchell
patent: 3693105 (1972-09-01), Kleinberg
patent: 3731218 (1973-05-01), Saunders et al.
patent: 3737801 (1973-06-01), Adams et al.
patent: 3965441 (1976-06-01), Roy et al.
patent: 3986152 (1976-10-01), Howell
patent: 4208641 (1980-06-01), Suzuki
patent: 4338582 (1982-07-01), Presser

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