Oscillation Condition of Quartz-Oscillating Circuit in High Frequency (1)

A novel oscillation condition of quartz oscillating circuit with 622 MHz AT-Cut HFF-Xtal (=High Frequency Fundamental-crystal) oscillator is established. A circuit analysis is performed by combining a shunt capacitance (C0) with a negative resistance (-Rci) and a combination capacitance (Ct). A load resistance (RL) is obtained by combining C0 with -Rci. A maximum load resistance (RLmax) is relative to the value of combination capacitance (Ct).