Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1995-07-24
1997-12-09
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455306, H04B 130
Patent
active
056970935
ABSTRACT:
An automatic gain control strategy for zero IF receivers in which the gain of low pass filters (20,22) is altered whilst keeping their bandwidths substantially constant. The low pass filters (20,22) are implemented as gyrator filters, each of which comprise at least one pair of transconductors, the ratio of the transconductances of which are adjustable in such a manner as to maintain the product of their transconductances constant. An electronic signal for adjusting the ratio of the transconductances is derived from an estimate of the instantaneous signal amplitude of the received signal.
REFERENCES:
patent: 4914408 (1990-04-01), Voorman
patent: 5179731 (1993-01-01), Trankle et al.
patent: 5263192 (1993-11-01), Mittel et al.
patent: 5263194 (1993-11-01), Ragan
patent: 5317217 (1994-05-01), Rieger et al.
Cusdin, deceased Anthony Richard
Davie Alan J.
Moore Paul A.
Bhattacharya Sam
Eisenzopf Reinhard J.
Marion Michael E.
U.S. Philips Corporation
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