Temperature-compensated circuit arrangement

Claim 1

AN ARRANGEMENT FOR TEMPERATURE STABILIZING OVER A PREDETERMINED TEMPERATURE RANGE THE INSERTION LOSS OF A QUARTZ CRYSTAL FILTER WHICH IS CONNECTED IN AN ALTERNATING CURRENT CIRCUIT EXTENDING FROM AN ALTERNATING CURRENT SOURCE TO A LOAD, AND HAS A PREDETERMINED FREQUENCY PASS BAND AND THE RESISTANCE OF WHICH VARIES SUBSTANTIALLY WITH TEMPERATURE OVER SAID RANGE, SAID ARRANGEMENT COMPRISING: CIRCUIT MEANS INCLUDING A THERMISTOR PHYSICALLY INTERPOSED IN SERIES WITH SAID CRYSTAL IN SAID ALTERNATING CURRENT CIRCUIT, SAID CIRCUIT MEANS HAVING A RESISTANCETEMPERATURE CHARACTERISTIC SUBSTANTIALLY COMPLEMENTARY TO THAT OF SAID CRYSTAL SUCH THAT UPON A CHANGE IN TEMPERATURE THE RESISTANCE OF SAID CIRCUIT MEANS CHANGES INVERSELY BY AN AMOUNT SUBSTANTIALLY EQUAL TO THE AMOUNT OF CHANGE IN RESISTANCE OF SAID CRYSTAL, THEREBY KEEPING THE EFFECTIVE RESISTANCE OF THE SERIES COMBINATION OF SAID CIRCUIT MEANS AND SAID CRYSTAL, AND HENCE THE INSERTION LOSS THEREOF, SUBSTANTIALLY CONSTANT OVER SAID TEMPERATURE RANGE WITHIN SAID FEQUENCY PASS BAND.