2Gb double-balanced PSK modulator using coplanar waveguides

A NUMBER OF phase-shift-keying (PSK) modulators havc been proposed for high bit-rate digital communications’>’. In particular, double-balanced techniques arc well suited for high bit-rate modulators/demodulators, because they can provide accurate 0-180’ PSK with minimal amplitude variation; minimal jitter and minimal undesired signal in a very- wide frequency band. In practice, however, standard MIC techniques are not suitable for the construction of the double-balanced schemes; due to their complicated circuit structures.