TEMPERATURE-STABLE OSCILLATOR CIRCUIT HAVING FREQUENCY-TO-CURRENT FEEDBACK

摘要

A signal generating circuit (600) and method are disclosed that do not require a phase- locked- loop and a low frequency temperature- stable oscillator. The method may include generating an oscillating output signal (602) (Ik) responsive to a feedback signa (608)1, where the feedback signal controls a frequency of the oscillating output signal, generating a current output signal having a magnitude corresponding to the frequency of the oscillating output signal, and then comparing the current output signal to a reference signal (654) to generate the feedback signal. The signal generating circuit (600) may include an oscillator circuit responsive to a feedback signal and a frequency- to- current conversion circuit (602responsive to a feedback signal (608) and a frequency- to- current conversion circuit (622,620) to generate a frequency dependent current signal corresponding to the frequency of the oscillating output signal. A feedback conversion circuit (612) compares the output signal with a reference signal (664) to generate the feedback signal (608) to the oscillator circuit.