Apparatus and method for broadcast band noise reduction in a transmitter with a low IF frequency
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United States of America Patent
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Mar 11, 2003
Grant Date -
N/A
app pub date -
Dec 16, 1998
filing date -
Dec 16, 1998
priority date (Note) -
Expired
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Abstract
In the broadcast band having a plurality of channels allocated therein, by using high-side injection and low-side injection as described herein, the noise introduced into the channel by the local oscillator signal can be minimized. The local oscillator signal in combination with the intermediate frequency determines the frequency of the channel signal being produced by the transmitter. The selected high-or low-side injection determines whether the bulk of the power is introduced into the combination frequency signal (i.e., the channel) above or below the local oscillator frequency, thereby moving the local oscillator frequency outside the broadcast band. The non-selected sideband is even further outside broadcast band.
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