Quadrature modulation circuit for use in a radio transmitter

Details Quadrature modulation circuit for use in a radio transmitter Quadrature modulation circuit for use in a radio transmitter

H - Electricity

03

C

H03C 1/02 (2006.01) H03C 3/09 (2006.01) H03L 7/185 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2104729

A quadrature modulation circuit is comprised of two frequency generators which generate a first frequency signal and a second frequency signal, respectively, and a mixer which mixes the first frequency signal and the second frequency signal to generate the carrier wave whose frequency is different from both the first frequency and the second frequency. By the quadrature modulation of this carrier wave according to a baseband signal, a transmission wave can be obtained. Since the first frequency differs from the carrier frequency and the second frequency differs from both the carrier frequency and the first frequency, the output signals of the frequency generators are not affected by the transmission wave.

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