FM Receiver having multiple IF stages
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Jun 8, 1993
filing date -
Jun 26, 1992
priority date (Note) -
Expired
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Abstract
An FM receiver includes an RF section, a first mixer stage for converting a desired RF reception signal into a first IF signal having a carrier frequency located on average at a first intermediate frequency, a first IF section for selecting the first IF signal, and a second mixer stage for converting the first IF signal into a second IF signal having a carrier frequency located on average at a second intermediate frequency. The second intermediate frequency is below the first intermediate frequency. A second IF section selects the second IF signal and is coupled to an FM demodulator for demodulating the baseband modulation signal of the desired RF reception signal, followed by a low-pass filter for selecting the baseband modulation signal. In order to enhance the signal processing of the FM receiver and to realize a receiver in a largely integrated form, to provide a substantially fully integrable IF stage which is easily exchangeable with the IF section of substantially all existing FM receivers of the superheterodyne type, and to realize a selectivity considerably greater than that of known IF filters, a third mixer stage is coupled between the second IF section and the FM demodulator for converting the second IF signal to a third IF signal having a carrier frequency located on average at a third intermediate frequency which is above the second intermediate frequency.
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- 15 United States
- 10 France
- 8 Japan
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Patent Owner(s)
- U.S. PHILIPS CORPORATION
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Bijker, Wolter | Eindhoven, NL | 4 | 184 |
De, Ruyter Hendricus C | Eindhoven, NL | 4 | 157 |
Kasperkovitz, Wolfdietrich G | Eindhoven, NL | 41 | 542 |
Sloof, Willem A | Eindhoven, NL | 3 | 152 |
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