Patent ID: 6486732
Filing Date: 2002-11-26
Classification: H04B

Abstract:
A modulator-demodulator, comprising:a voltage controlled oscillator; a divider chain connected downstream of said voltage controlled oscillator and having a plurality of series-connected dividers each with a respective even-numbered division factor, and each of said dividers produces carrier signals including a first carrier signal and a second carrier signal orthogonal with respect to the first carrier signal; a quadrature demodulator for receiving an input signal and connected to one of said dividers of said divider chain producing the carrier signals at a desired carrier frequency; a first vector modulator having mixers connected to said dividers of said divider chain producing the carrier signals at required carrier frequencies; a further divider with an even-numbered division factor connected downstream of said first vector modulator; and a second vector modulator for producing a transmitted signal, said second vector modulator connected downstream of said further divider.