Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-09-30
1993-01-26
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328167, H03B 100, H03K 500
Patent
active
051824787
ABSTRACT:
A variable band-pass filter circuit includes a variable band-pass filter which filters an input signal such as a chrominance signal. An output the variable band-pass filter is phase-compared with a reference signal in a phase comparator. An output of the phase comparator is applied to the variable band-pass filter as a control signal. The output of the variable band-pass filter is level-limited by a limiter and then applied to an adder which further receives the reference signal. One of the input signal and an output of the adder is selected by a switch to be applied to an input of the variable band-pass filter. A reference signal component is removed by the sample hold circuit to be prevented from being outputted from an output of the variable ban-pass filter.
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patent: 5023491 (1991-06-01), Koyama
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"Automatic Tuning of Quality Factors for VHF CMOS Filters"; 1990 IEEE Int. Symposium on Circuits and Systems May 1-3; vol. 2 of 4; Sheraton Hotel, New Orleans, La., pp. 1147-1150.
"Microminiaturization is Forcing Inductors Out"; Electronic Design; vol. 18 No. 19; Sep. 13, 1970; Hasbrouck Heights, NJ; pp. 27-30.
Callahan Timothy P.
Sanyo Electric Co,. Ltd.
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