MODULATOR MADE INTO MONOLITHIC IC

摘要

PURPOSE:To reduce deviation of modulation phase and improve modulation phase characteristic by neutralizing capacity between base and collector of an transistor in output stage with capacity between base and collector of an transistor excited with reverse phase. CONSTITUTION:An input port (c) is used as a base band input port of a local port (d). Modulated waves are led from an output port (e). In this modulator, the capacity Q21-Q24 between the base and the collector of the transistor in the output stage is neutralized with the capacity Q28-Q31 between the base and the collector of the transistor excited with the reverse phase. This reduces the deviation of phase at the output port (e) to improve the modulation phase characteristic.