Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1997-03-11
2000-03-07
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
4552342, 455303, 375346, 375344, H04B 126
Patent
active
060351861
ABSTRACT:
An integrated receiver in which in order to permit ac-coupling between stages and to remove the effects of strong directly detected amplitude modulated interfering signals lying within the input band of the receiver, the input signal is frequency down converted using a local oscillator signal which provides an intermediate frequency (F.sub.if) which lies above the frequency of the directly detected interferer (F.sub.AMP). The outputs from the frequency down converters (14, 16, 18, 20) are ac coupled to filtering means the outputs of which are applied to an equalizer (52). The filtering means may comprise a polyphase filter (50), the frequency response of which is distorted by the ac coupling capacitors (54, 56). By applying the outputs of the filtering means to the equalizer (52) substantially all the distortion introduced by the ac coupling capacitors (54, 56) on the filter response is removed to provide an acceptable signal for detection and recovery of the modulating signal.
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Barnard Michael E.
Moore Paul A.
Eisenzopf Reinhard J.
Fuller Greta J.
Halajian Dicran
U.S. Philips Corporation
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