Receiver having an adjustable bandwidth filter

Details Receiver having an adjustable bandwidth filter Receiver having an adjustable bandwidth filter

1994-12-22

1997-02-18

Pham, Chi H.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455307, 4552001, 455340, 327558, H04B 116, H04B 1500

Patent

active

056049277

ABSTRACT:
A radio receiver has a frequency down conversion stage including a first passive filter tuned to a lower frequency. An amplifier functioning as a voltage-to-current converter includes a resistor (60) which can be shunted by a second passive filter in response to actuation of symmetrically arranged switching devices. When the second passive filter shunts the resistor, the overall pass band is raised to a higher frequency. Additionally, the amplifier has a lower noise figure when the second passive filter shunts the transconductor.

REFERENCES:
patent: 4850038 (1989-07-01), Shibata et al.
patent: 4905306 (1990-02-01), Anderson
patent: 5404589 (1995-04-01), Bijker

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