ABSCISSA SIGNAL GENERATING CIRCUIT

摘要

PURPOSE: To obtain a quadrature axis signal generating circuit which can directly control phase shifts by a simple method. CONSTITUTION: A quadrature axis signal generating circuit QGM can directly control in-phase IS and quadrature axis phase QS carrier signals derived from a master carrier signal CS having a desired carrier frequency. The circuit QGM deduces first and second signals which intersect each other at nearly right angles through aperiodic RC- and CR-filters and carrier signals IS and QS by adding the output signals of the RC- and CR-filters to first and second amplified signals in a crossing state. The orthogonality of the carrier signals is controlled through a phase adjusting signal PAS which corrects the code and amplitude of the above-mentioned output signals added to the amplified signals.