Wide band frequency discriminator

Claim 1

A FREQUENCY DISCRIMINATOR CIRCUIT RESPONSIVE TO INPUT SIGNAL FREQUENCY VARIATIONS ABOUT A CENTER FREQUENCY COMPRISING: (A) A FIRST IMPEDANCE MATCHING NETWORK COUPLED IN SERIES WITH AN INPUT SIGNAL AND TUNED ABOVE THE CENTER FREQUENCY WITH A FREQUENCY DIFFERENTIAL APPROXIMATELY EQUAL TO OR GREATER THAN HALF THE CENTER FREQUENCY AND HAVING A Q APPROXIMATELY EQUAL TO THE CENTER FREQUENCY; (B) A SECOND IMPEDANCE MATCHING NETWORK SIMILAR TO SAID FIRST NETWORK COUPLED IN SERIES WITH SAID INPUT SIGNAL AND IN PARALLEL WITH SAID FIRST NETWORK AND TUNED BELOW THE CENTER FREQUENCY WITH A FREQUENCY DIFFERENTIAL APPROXIMATELY EQUAL TO OR GREATER THAN HALF THE CENTER FREQUENCY AND HAVING A Q APPROXIMATELY EQUAL TO THE CENTER FREQUENCY; (C) FIRST DETECTOR MEANS COUPLED TO SAID FIRST IMPEDANCE MATCHING NETWORK FOR PROVIDING AN INSTANTANEOUS D.-C. VOLTAGE PROPORTIONAL TO THE INSTANTANEOUS A.-C. VOLTAGE PRODUCED IN SAID FIRST NETWORK, (D) SECOND DETECTOR MEANS COUPLED TO SAID SECOND IMPEDANCE MATCHING NETWORK FOR PROVIDING AN INSTANTANEOUS D.-C. VOLTAGE PROPORTIONAL TO THE INSTANTANEOUS A.-C. VOLTAGE PRODUCED IN SAID SECOND NETWORK; (E) OUTPUT COMBINING MEANS COUPLED TO SAID FIRST AND SECOND DETECTOR MEANS TO PROVIDE AN OUTPUT SIGNAL IN ACCORDANCE WITH THE INSTANTANEOUS DIFFERENCE IN SAID D.-C. VOLTAGES; (F) SAID IMPEDANCE MATCHING NETWORKS HAVING AN OUTPUT IMPEDANCE TO INPUT IMPEDANCE RATIO EXCEEDING ONE WHEREBY A VOLTAGE GAIN INTO THE DETECTING DEVICES IS OBTAINED; AND (G) SAID IMPEDANCE MATCHING NETWORKS BEING TUNED SO AS TO PROVIDE SUBSTANTIALLY LINEAR VOLTS PER CYCLE RESPONSE ABOUT THE CENTER FREQUENCY OVER A FREQUENCY BANDWIDTH OF THE SAME ORDER AS THE CENTER FREQUENCY ITSELF.