Oscillator Power Supply Control for Faster PLL Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The prolonged process of oscillator stabilization from start to stabilization affects the rapid operation of phase-locked loops (PLLs) due to variations in oscillation amplitude and frequency, which is a significant limiting factor.
Innovation Solution
An oscillation circuit with an amplitude comparison circuit, voltage control circuit, and adjustable power source is used to stabilize the oscillator amplitude in a closed-loop power supply manner, obtaining a target control voltage, and subsequently operates in an open-loop power supply manner to maintain stability without repeated adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the oscillator operates as a damped oscillation system, then the oscillation amplitude stabilizes over time, but the stabilization process is prolonged and affects rapid PLL operation
Solution Approach 1:
The patent applies preliminary action by detecting the oscillation amplitude in advance during the stabilization process and generating a control voltage before the oscillation is fully stable. This control voltage is then used to adjust the power supply voltage proactively, preventing prolonged amplitude variations and enabling faster PLL locking without waiting for natural stabilization.
2Stability of the object's composition
If the oscillator frequency varies during the variation process, then the oscillation stabilizes eventually, but the PLL cannot operate normally until stabilization is complete
Solution Approach 1:
The patent implements feedback by continuously detecting the oscillation amplitude and using the detected signal to generate a control voltage that adjusts the power supply voltage. This closed-loop feedback mechanism maintains oscillation frequency stability during the transition period, enabling the PLL to operate normally much faster than traditional systems that must wait for natural stabilization.
Data Source
AI summary
An amplitude comparison circuit, a voltage control circuit, an adjustable power source, and an oscillator are disposed in an oscillation circuit. In a first time period, an amplitude of an oscillation signal is obtained, and a first control voltage is generated based on the amplitude. The first control voltage when the amplitude is constant is obtained as a target control voltage, and is stored. After the first time period, during subsequent operation of the oscillator, the voltage control circuit controls, by using the target control voltage, the adjustable power source to output a power supply voltage, and power is supplied to the oscillator at the power supply voltage.