Overtone crystal oscillating circuit
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsEiji Masuda, Shigemi Sakamoto
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Abstract
An overtone crystal oscillating circuit is disclosed which includes a complementary MOS inverter formed of P and N channel MOS transistors, a crystal resonator and a feedback resistor which are connected between input and output terminals of the complementary MOS inverter, and first and second capacitors respectively connected to the input and output terminals of the complementary MOS inverter. The crystal oscillating circuit is further provided with a series circuit formed of an inductor and a capacitor and connected in parallel with the first or second capacitor to form a parallel resonant circuit.
Claims16
An overtone crystal oscillating circuit comprising:
- a first complementary MOS inverter circuit having input and output terminals;
- a crystal resonator connected between the input and output terminals of said inverter circuit;
- resistive means connected between the input and output terminals of said inverter circuit;
- first and second capacitances respectively connected to the input and output terminals of said inverter circuit;
- and
- a series circuit, including inductance and capacitance, which is connected in parallel with one of said first and second capacitances thereby to form a parallel resonating circuit.
Dependencies are inferred from the claim text.