Amplitude controlled quartz oscillator with broad voltage and temperature range

An oscillator including an input terminal, an output terminal, a resonator, and an oscillator circuit including:

• first and second power supply terminals,
• two capacitors connected between the first power supply terminal and the input terminal, and respectively the output terminal of the oscillator,
• a first active transistor connected between the first power supply terminal and the output terminal,
• first means for polarising the first active transistor,
• a second active transistor, of complementary type to the first active transistor and whose current path is series connected with the first active transistor and forming therewith an inverting amplifier,
• second means for polarising the second active transistor,
• a first current source formed by a transistor of the same type as the second active transistor, between the second power supply terminal and the second active transistor,
• current control means for the second polarising means,
• wherein in steady operating conditions, said second polarising means are arranged for providing a polarisation voltage across the gate of the second active transistor corresponding to the transistor gate voltage of the first current source to within one voltage shift.