Linearized frequency modulated crystal oscillators

Claim 1

IN AN ELECTRIC CIRCUIT OPERABLE TO OSCILLATE OVER A PREDETERMINED FREQUENCY RANGE, A CRYSTAL TO CONTROL THE FREQUENCY OF OSCILLATION IN SAID RANGE, THE CRYSTAL REACTANCE AT VERYING FREQUENCY BEING NON-LINEAR AND CAPACITIVE WITHIN SAID FREQUENCY RANGE, AN INDUCTANCE IN SERIES WITH THE CRYSTAL, A VOLTAGE-VARIABLE CAPACITANCE IN SERIES WITH THE CRYSTAL AND HAVING A REACTANCE WHICH IS NON-LINEAR AT VARYING REVERSE-BIAS VOLTAGE-VARIABLE CAPACITANCE BEING OPERABLE IN COMBINATION WITH SAID CRYSTAL TO VARY THE FREQUENCY OF OSCILLATION WITHIN THE SAID RANGE, MEANS TO APPLY A QUIESCENT REVERSE-BIAS VOLTAGE TO THE VOLTAGEVARIABLE CAPACITANCE, THE BIAS MEANS BEING OPERABLE TO ESTABLISH A QUIESCENT POINT WITHIN SAID RANGE ABOUT WHICH THE SUM OF THE REACTANCES OF THE CRYSTAL AND THE VOLTAGEVARIABLE CAPACITANCE IN COMBINATION IS SUBSTANTIALLY LINEAR OVER THE SAID FREQUENCY RANGE.