Digital Frequency Locked Loop for Precise Low-Power Clock Generation
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Solution Overview
Problem
Current clock processing units in intelligent devices, such as phase locked loops, face challenges with high circuit volume, cost, and complexity, particularly in digital-analog hybrid phase locked loops, which require analog circuits for voltage-controlled oscillators and have limitations in power efficiency and integration.
Innovation Solution
A frequency locked loop with a control circuit that generates sub-control signals based on the relationship between input and feedback frequencies, using a digital control oscillation circuit to produce a target frequency, allowing for a purely digital and programmable solution with low power consumption and high precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an analog phase locked loop is used, then high precision and fast response are achieved, but circuit volume increases, cost increases, and device complexity increases
Solution Approach 1:
The patent replaces the analog voltage-controlled oscillator with a digital frequency-controlled oscillator, substituting analog control mechanisms with digital control. The frequency control word replaces continuous voltage control, enabling purely digital implementation while maintaining frequency control precision and reducing circuit complexity.
Solution Approach 2:
The patent changes the control parameter from continuous voltage (analog) to discrete frequency control words (digital). This parameter transformation enables the system to achieve high precision frequency control through digital means, resolving the contradiction between precision and complexity.
2Device complexity
If a digital-analog hybrid phase locked loop is used, then circuit size is reduced and control is improved, but analog circuits are still required for voltage controlled oscillators
Solution Approach 1:
The patent completely replaces the voltage-controlled oscillator with a frequency-controlled oscillator, eliminating the need for analog circuits. The digital frequency control word directly controls the oscillator frequency, achieving full digital implementation and improving adaptability to different digital platforms.
3Reliability
If traditional phase locked loops are used, then clock signal generation is achieved, but power consumption is high
Solution Approach 1:
The patent replaces analog control circuits with digital control circuits, including a digital frequency detector and digital signal generation sub-circuit. This substitution reduces power consumption by eliminating analog circuit power requirements while maintaining clock signal stability through digital control mechanisms.
Data Source
AI summary
A frequency locked loop, an electronic device, and a frequency generation method are provided. The frequency locked loop includes: a control circuit, configured to judge a size relationship between an input frequency and a feedback frequency to obtain a control signal, and determine a frequency control word according to the control signal, in which the control signal includes a first sub-control signal and a second sub-control signal, the control circuit is configured to generate the first sub-control signal in a case where the input frequency is greater than the feedback frequency, and the control circuit is configured to generate the second sub-control signal different from the first sub-control signal in a case where the input frequency is less than the feedback frequency; and a digital control oscillation circuit, configured to generate and output an output signal having a target frequency according to the frequency control word.