Two-Counter Frequency Compensation for Oscillator Stability
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Solution Overview
Problem
Oscillators in electronic devices experience frequency variations due to changes in process, voltage, and temperature, leading to instability in system operations.
Innovation Solution
An apparatus and method for frequency compensation using a main clock generator, a sub clock generator, a first counter to set a reference period, a second counter to sense frequency changes, and a frequency compensator to provide a compensated frequency based on the changed frequency of the sub clock, ensuring stability across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency compensation is implemented using multiple counters and clocks, then frequency stability is improved, but device complexity increases
Solution Approach 1:
The frequency compensation apparatus is divided into distinct functional modules: a first counter for setting reference period, a second counter for sensing frequency changes, and a frequency compensator for providing compensated frequency. This segmentation allows each component to perform its specific function independently, improving frequency stability while maintaining manageable complexity through modular design.
Solution Approach 2:
The first counter acts as an intermediary between the main clock and the second counter, providing a stable reference period. The second counter then uses this reference to sense frequency changes in the sub clock. This intermediary mechanism enables accurate frequency compensation without requiring direct complex interaction between all components.
2Measurement precision
If continuous frequency monitoring is performed using a second counter, then frequency accuracy is improved, but use of energy increases
Solution Approach 1:
The second counter performs frequency sensing operations periodically based on the reference period established by the first counter, rather than continuously. This periodic operation maintains frequency measurement accuracy while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The first counter pre-establishes a reference period using the main clock before the second counter begins frequency sensing. This preliminary action provides a stable timing basis that enables the second counter to accurately measure frequency changes without requiring constant high-power operation.
Data Source
AI summary
A frequency compensation apparatus includes a first counter setting a reference period using a main clock, a second counter sensing a change in the frequency of a sub clock using the reference period, and a frequency compensator providing a compensated frequency using information on the changed frequency of the sub clock. Related methods are also described.