Direct conversion receiver especially suitable for frequency shift keying (FSK) modulated signals
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United States of America Patent
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-
Nov 1, 1994
Grant Date -
N/A
app pub date -
Jul 23, 1991
filing date -
Jul 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A direct conversion receiver for providing a direct conversion of a radio frequency signal having a carrier frequency comprises a local oscillator for substantially equal frequency to the carrier, and a semiconductor integrated circuit mounting mixers and amplifiers for amplifying inputs to the mixer. The amplifiers amplify the local oscillation signals and/or radio frequency signal inputted from the outside of the semiconductor integrated circuit and supply the amplified signals to the mixers. The mixers mix these inputted signals and output the mixed signals to the outside of the semiconductor integrated circuit. By thus forming the receiver, radiation of the local oscillation signals to outside of the receiver and leakage inside thereof can be suppressed.
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