Patent attributes
A crystal oscillator in which a temperature characteristic of an oscillation frequency is improved to omit a measurement operation of the temperature characteristic of the oscillator, and manufacturing is facilitated to reduce a manufacturing time. In the crystal oscillator, a power voltage is applied to a collector of a transistor via series connection of an inductor for resonance and a resistance, a crystal unit is disposed in a loop which returns to an emitter of the transistor from a point between the inductor L4 and the resistance, and further, in the loop, a first parallel circuit in which a stationary capacitor having a negative temperature coefficient and a stationary capacitor having a zero temperature coefficient are connected in parallel with each other is inserted between an oscillation output taking point and the collector.
