Switched-capacitor modulator for quadrature modulation

Details Switched-capacitor modulator for quadrature modulation Switched-capacitor modulator for quadrature modulation

H - Electricity

03

C

332/64

H03C 1/02 (2006.01) H03C 1/00 (2006.01) H03H 19/00 (2006.01) H03K 4/02 (2006.01) H04L 27/36 (2006.01)

Patent

CA 1189582

ABSTRACT OF THE DISCLOSURE A switched-capicitor modulator for quadrature modula- tion 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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