Apparatus and method for reducing harmonic interference generate

Details Apparatus and method for reducing harmonic interference generate Apparatus and method for reducing harmonic interference generate

1991-11-04

1993-11-16

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375103, 375 1, 455317, H03D 104, H03D 106, H03K 501, H03K 604

Patent

active

052630552

ABSTRACT:
An apparatus and method therefor substantially reducing the interference of a harmonic frequency component (301) of a clock signal with a filtered received signal (302), comprises a frequency spreading signal generator (127) and a signal modulator (125). The frequency spreading signal generator (127) produces a frequency spreading signal (130). The signal modulator (125) modulates the clock signal, produced by a clock signal generator (129), with the frequency spreading signal (130) to produce a modulated clock signal (131) including a modulated harmonic frequency component (303). The power level of a modulated harmonic frequency component (303), corresponding to the harmonic frequency component interfering with the filtered signal (202-204), is spread over a frequency bandwidth (f.sub.6 -f.sub.7) greater than the predetermined frequency bandwidth (f.sub.4 -f.sub.5) causing the power level of the modulated harmonic frequency component (303) within the predetermined frequency bandwidth (f.sub.4 -f.sub.5) to decrease.

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patent: 5148447 (1992-09-01), Ito
RF Design, Apr. 1991, "Designing a Direct Sequence Spread Spectrum Secure Communication System", beginning on p. 31.
Hewlett Packard Journal, Sep. 1980, "Automatic Measurements with High Performance Universal Counter", pp. 21-31.

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