Commutating filter passing only the fundamental frequency and od

Details Commutating filter passing only the fundamental frequency and od Commutating filter passing only the fundamental frequency and od

1983-11-14

1985-05-21

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

307353, 328151, 333172, 333174, H03H 1900, H03H 1104

Patent

active

045189366

ABSTRACT:
A commutating filter circuit producing only the fundamental frequency and odd harmonics of an input signal comprises first and second commutating filters each connected to receive the input signal and coupled to pass an output signal to the non-inverting and inverting terminals, respectively, of a differential amplifier. The first filter comprises N stages, each having a time constant of RC and a filter sampling frequency of f.sub.1. The second filter comprises N/2 stages, each having a time constant of 2RC and a filter sampling frequency of 2f.sub.1. The resultant signal from the differential amplifier contains only the fundamental frequencies and odd harmonics of the input signal.

REFERENCES:
patent: 3758884 (1973-09-01), Bahler et al.
patent: 3904978 (1975-09-01), Daniels et al.
patent: 4290034 (1981-09-01), Fraser, Jr. et al.
patent: 4331894 (1982-05-01), Gregorian et al.

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