Crystal Oscillator Low-Power Control With Ratio-Based Amplitude Detection
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Solution Overview
Problem
Existing low-power crystal oscillator modules struggle to accurately detect oscillation signal amplitudes due to variations in manufacturing process, system voltage, or environmental temperature, leading to incorrect enabling or disabling of the crystal oscillator.
Innovation Solution
A low-power mode control module comprising a stable output detector, amplitude detector, programmable reference voltage generator, and low-power mode controller, which adjusts the amplitude control signal and generates upper and lower reference voltages to ensure accurate enabling or disabling of the crystal oscillator, independent of process, voltage, or temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the controller detects oscillation signal amplitudes to control enabling and disabling of the crystal oscillator, then power consumption is reduced, but the detection accuracy deteriorates due to process, voltage, or temperature variations
Solution Approach 1:
The patent changes the detection parameter from absolute amplitude to amplitude ratio. The amplitude detector compares the oscillation output signal amplitude with the oscillation input signal amplitude, and the controller determines oscillation status based on whether the ratio exceeds a threshold. This ratio-based detection is immune to PVT variations because both signals experience the same environmental changes, resolving the contradiction between power reduction and detection accuracy.
2Device complexity
If the controller uses fixed amplitude thresholds for detection, then the control logic is simple, but the reliability deteriorates under varying environmental conditions
Solution Approach 1:
The patent implements feedback by having the amplitude detector continuously monitor the ratio between output and input signal amplitudes and feed this information to the controller. The controller adjusts the enabling/disabling decisions based on the real-time ratio feedback, maintaining reliable operation across varying environmental conditions while keeping the control logic relatively simple through the use of a fixed threshold comparison.
Data Source
AI summary
A low power mode control module for a crystal oscillator which performs the following steps: detecting whether an oscillation output signal of the crystal oscillator is output stably; when the oscillation output signal of the crystal oscillator is output stably, comparing at least one of an oscillation input signal and the oscillation output signal with an amplitude control signal to determine whether to adjust the amplitude control signal; when the amplitude control signal does not need to be adjusted, generating an upper bound reference voltage and a lower bound reference voltage associated with the amplitude control signal; and according to whether the oscillation output signal exceeds a reference voltage range of the upper reference voltage and the lower reference voltage, generating a low power mode control output signal associated with a crystal oscillator enable signal for enabling the crystal oscillator.