Active polyphase filters

Details Active polyphase filters Active polyphase filters

1985-12-16

1988-02-02

Griffin, Robert L.

Telecommunications

Transmitter

Amplitude modulation

455306, 455307, 307359, 332 45, H04B 110, H03C 300

Patent

active

047233184

ABSTRACT:
An active polyphase filter arrangement in which asymmetric poles and zeros are obtained using feedback. In implementing the active polyphase filter arrangement there is provided a feedforward path comprising a first polyphase filter and a feedback path comprising a second polyphase filter. Both filters are preferably two phase filters. In operating the polyphase filter arrangement the loop gain at the unwanted "image" frequency can either be made much greater than unity thereby making the feed forward path insensitive to mismatching or be made much less than unity thereby making the feedback path insensitive to mismatching.

REFERENCES:
patent: 3611165 (1971-10-01), Hills
patent: 4339727 (1982-07-01), Kage et al.
patent: 4446438 (1984-05-01), Chang et al.

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