Phase interpolation receiver for angle modulated RF signals

Details Phase interpolation receiver for angle modulated RF signals Phase interpolation receiver for angle modulated RF signals

2005-07-26

2005-07-26

Craver, Charles (Department: 2682)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S311000, C455S302000, C455S207000, C455S308000

Reexamination Certificate

active

06922555

ABSTRACT:
A phase interpolation receiver for receiving angle modulated radio frequency signals. The receiver comprises mixers for down-converting the received angle modulated signal to lower frequency signals, limiters, interpolation filters, and a demodulator. The mixers down-convert the received RF signal to a low IF intermediate frequency signal. The low IF intermediate frequency signal is limited. After further down-conversion to zero IF, using quadrature mixers, the limited signal is phase interpolated. The intermediate frequency is chosen such that the limited signal comprises an unwanted signal at twice the intermediate frequency that acts as a noise spreading signal for spectrally spreading of quantization noise generated by the limiters, and the cut-off frequency of the interpolation filters is chosen such that the unwanted signal and the spread quantization noise are suppressed.

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By Wally H. W. Tuttlebee, “Cordless Telecommunications in Europe”, The Evolution of Personal Communications, Pub. Springer-Verlag, London, 1990. pp. 211-214.

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