Self-Regulating Clock Generator for Stable Frequency Control
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Solution Overview
Problem
Portable devices require an independent clock generator that maintains accuracy with minimal frequency drift and low power consumption, despite being affected by temperature and voltage variations.
Innovation Solution
A clock generator system comprising an oscillator, feedback circuit, voltage detector, control voltage generator, and bias current source, where the frequency of the clock signal is adjusted by a bias current generated from a control voltage, and the control voltage is modified based on a comparison between a charged voltage and a source voltage to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference-based clock generator is used to maintain frequency accuracy, then frequency stability is improved, but device complexity and power consumption increase
Solution Approach 1:
The clock generator uses its own output clock signal to generate the feedback signal through the feedback circuit, eliminating the need for an external reference clock. The system self-regulates by comparing its own output frequency against the target frequency and automatically adjusting the control voltage to maintain accuracy, thereby reducing device complexity and power consumption while maintaining frequency stability.
Solution Approach 2:
The patent implements a feedback mechanism where the output clock signal is fed back through a feedback circuit that generates a feedback signal indicative of the clock frequency. This feedback signal is compared with a reference voltage, and the difference is used to adjust the control voltage applied to the voltage-controlled oscillator, creating a closed-loop system that maintains frequency accuracy without requiring external reference components.
2Reliability
If temperature compensation mechanisms are added to maintain clock accuracy under temperature variations, then frequency stability is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent employs a voltage-controlled oscillator whose oscillation frequency can be dynamically adjusted by changing the control voltage parameter. The feedback circuit continuously monitors the output frequency and adjusts the control voltage to compensate for temperature-induced frequency drift, maintaining accurate clock operation across varying temperatures without requiring additional heating or cooling mechanisms that would increase power consumption.
Data Source
AI summary
A clock generator includes an oscillator that generates a clock signal as an output of the clock generator, where the frequency of the clock signal is dependent on a bias current. A feedback circuit receives the clock signal and generates a feedback signal indicative of a frequency of the clock signal. A voltage detector generates a charged voltage using the feedback signal, compares a source voltage with the charged voltage, and generates a detection signal indicative of the comparison between the source voltage and the charged voltage. A control voltage generator generates a control voltage using the detection signal. The bias current is generated by a bias current source using the control voltage.