Circuit for phase shift keying

摘要

A sampling circuit, for a digital modulation unit, with a double-output differential amplifier stage and load side connected DC-decoupled output stage with two input branches, is designed to make the i.f. output signal independent from drive voltage fluctuations, on the temp. and mixer offset voltage, as caused by static and dynamic noise variables. This is achieved by coupling each input branch (T20, R23, T31; T21, R24, T32) of the output stage (AT) by a capacitor (C3, C4) to the assigned output terminals (T9, T10) of the differential amplifier stage (M2).