Tuner comprising a selective filter
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United States of America Patent
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Issued Date -
Jul 3, 2003
app pub date -
Nov 21, 2002
filing date -
Nov 27, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The invention relates to a tuner for converting a RF signal (110) into an IF output signal (202), said tuner comprising a mixer (111) for generating a first IF signal (201), processing means (114) for filtering said first IF signal (201) so as to generate said IF output signal (202). The tuner according to the invention is characterized in that said processing means (114) comprise: a voltage follower circuit (203) receiving said first IF signal (201) for generating a second IF signal (204) at a low impedance, control means (205) for controlling the value of the bias current of said voltage follower circuit (203), a filter (206) having the double resonance frequency for filtering said second IF signal (204) and generating said IF output signal (202). The tuner according to the invention has a strong selectivity for eliminating the residues of frequency components of channels adjacent to the selected channel, as well as a linear frequency response.
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