Frequency converter capable of reducing noise components in local oscillation signals
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United States of America Patent
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May 27, 1997
Grant Date -
N/A
app pub date -
Feb 12, 1996
filing date -
Feb 13, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A frequency converter includes a high-frequency signal input circuit for forming a high-frequency signal with bias voltage or current to output a bias-added high-frequency signal; a local oscillation signal input circuit having a first element for forming a local oscillation signal with bias voltage or current and an element for suppressing a noise component having a frequency near a frequency of multiple of even number of a local oscillation frequency to output a bias-added and noise suppressed local oscillation signal; and a multiplication circuit for multiplying the bias-added high-frequency signal and the bias-added and noise suppressed local oscillation signal. By the constitution, it is possible to convert the high-frequency signal into a desired frequency signal having low influence of noises having frequency near the frequency of multiple of even number especially zero or two of the local oscillation signal to thereby reasonably suppress gain and noise in the high-frequency amplifier and local oscillator and reducing a current consumption of a radio receiver.
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