Device for rejection of the image signal of a signal converted to an intermediate frequency
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United States of America Patent
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Oct 14, 1997
Grant Date -
N/A
app pub date -
May 24, 1995
filing date -
Jun 6, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a device for rejecting the image signal of a signal converted to a predetermined intermediate frequency, a local oscillator supplies a local signal at a frequency chosen according to the frequency of the signal and the intermediate frequency. A first phase-shifter has two passive phase-shifter cells including resistive and capacitive components and respectively connected to the output of the oscillator to supply two mixer signals in phase quadrature. Two mixers receive an input signal containing a signal and its image signal and a respective mixer signal and supply two intermediate signals at the intermediate frequency. A second phase-shifter comprises two passive phase-shifter cells comprising resistive and capacitive components and respectively connected to the outputs of the two mixers to introduce a further phase quadrature relationship between the two intermediate signals. A summing device connected to the outputs of the two passive phase-shifter cells of the second phase-shifter eliminates the image signal.
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