Patent ID: 6052036
Filing Date: 2000-04-18
Classification: H03B,H03L

Abstract:
A crystal controlled oscillator circuit comprising:an oscillator amplifier having an input and an output, said input being connected to a crystal resonator for establishing oscillation in a preselected frequency range;means for rectifying the output signal from said oscillator amplifier;means for capacitively coupling the output of said oscillator amplifier to said rectifying means;means for low pass filtering the output signal from said rectifying means to produce a d.c. signal proportional to the amplitude of the output of said oscillator amplifier;a feedback loop for connecting said d.c. signal from said low pass filtering means back to a current source of said oscillator amplifier to regulate the amplitude level of the oscillator amplifier output to a preselected value and limit power consumption of said oscillator circuit; andmeans for tuning said oscillator amplifier in response to variations in absolute temperature of said oscillator circuit.