Circuit arrangement for reducing intermodulation in a bandpass f

Details Circuit arrangement for reducing intermodulation in a bandpass f Circuit arrangement for reducing intermodulation in a bandpass f

1998-01-23

2000-06-06

Chin, Stephen

Pulse or digital communications

Transceivers

330107, 330124, 330132, 330149, 370278, 370349, 375346, 455266, 455327, 455295, H04B 138

Patent

active

060728248

ABSTRACT:
A circuit arrangement that reduces selected intermodulation. The circuit arrangement includes a signal amplifier coupled to a bandpass filter via an electrical path. Signal energy outside the passband is reflected back into the amplifier and causes intermodulation. The electrical path is constructed with a length that reduces intermodulation, where the length is an odd multiple of one-fourth the wavelength of a predetermined frequency in the passband. The length of the electrical path reduces intermodulation because certain signals reflected by the bandpass filter are approximately 180.degree., or an odd multiple thereof, out of phase. Energy of problematic signals that are near the edge of the passband or in the stopband is reduced, such as third order intermodulation product and pairs of signals that produce third order intermodulation products.

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