Switched-capacitor modulator for quadrature modulation
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United States of America Patent
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Jul 3, 1984
Grant Date -
N/A
app pub date -
Sep 22, 1981
filing date -
Sep 22, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switched-capacitor modulator for quadrature modulation is disclosed. The modulator of the present invention provides a means for simultaneous modulation of two carrier signals in quadrature by two input signals in such a way that the gains of the two modulations are exactly the same. In accordance with the invention a switched-capacitor modulator is provided having a plurality of input signal sources for quadrature amplitude modulation. The invention provides for a single common switched-capacitor network with multiple switches or multiple switched-capacitor networks for each incoming modulating signal. A switched-capacitor network utilized to form and modulate a carrier signal for shaping the carrier to reduce sidebands of the third and fifth harmonics in the modulated signal is also disclosed.
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