Patent ID: 7405608

Claim:
A modulator apparatus operating at a low supply voltage, configured for receiving an input-voltage signal from a base band circuit and supplying an output-voltage signal at a modulation frequency under control of a signal generated by a local oscillator, the modulator apparatus comprising: a Gilbert-cell stage which supplies an output-voltage signal under the control of said signal generated by said local oscillator, the Gilbert-cell stage further including an output load for carrying out a current-to-voltage conversion and supplying the output-voltage signal; and a transconductor stage having: a voltage-to-current conversion module structured to perform a voltage-to-current conversion of said input-voltage signal and having a differential load; a differential feedback network configured for reproducing in a proportional way said input-voltage signal on the differential load, and a current-mirror module coupled to said voltage-to-current conversion module and configured for mirroring a current in the Gilbert-cell stage.