Nonquadrature correction circuit

摘要: A phase comparator has additional circuitry for correcting nonquadrature error during operation of the comparator. The a 90 degree power divider which receives reference signal input and produces two outputs, one shifted degrees out with other. also zero return signal, such as reflected radar transmitter unit. outputs dividers are applied to mixers filters result in an I video output whose frequency is difference between frequencies, Q identical but degrees. correction circuit includes trap connected tunable about center approximately third harmonic fundamental frequency. While operating, detuned from while monitored until nears zero. Band pass filter means electrically isolate external can improve operation.