Temperature-stable oscillator circuit having frequency-to-current feedback
December 30, 2029. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCharge pump bias control in a phase lock loop Digital damping method and apparatus for phase-locked loops Zerox-IF receiver with tracking second local oscillator and demodulator phase locked loop oscillator Oscillator circuit employing frequency-locked loop feedback topology RF/microwave oscillator having frequency-adjustable DC bias circuit VCO circuit using negative feedback to reduce phase noise Precision oscillator circuits and methods with switched capacitor frequency control and frequency-setting resistor Double edge-triggered flip-flops Phase-locked loop circuit, information processing apparatus, and information processing system Self-adjusting clock generator with stable frequency output InventorsAssigneeApplicationNo. 12650208 filed on 12/30/2009US Classes:327/165Regenerating or restoring rectangular (e.g., clock, etc.) or pulse waveformExaminersPrimary: Donovan, LincolnAssistant: Jager, Ryan Attorney, Agent or FirmInternational ClassH03K 5/01AbstractA signal generating circuit 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 responsive to a feedback signal, 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 to generate the feedback signal. The signal generating circuit may include an oscillator circuit responsive to a feedback signal and a frequency-to-current conversion circuit configured to generate a frequency dependent current signal that is compared to a reference current to generate an output signal corresponding to the frequency of the oscillating output signal. A feedback conversion circuit compares the output signal with a reference signal to generate the feedback signal to the oscillator circuit.Other References
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