Phase Interpolator Amplitude Feedback for Accurate Clock Synthesis
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Solution Overview
Problem
Existing phase interpolators face challenges in accurately synthesizing high-frequency periodic signals, leading to amplitude variations that can result in lost waveform information and impaired phase interpolation, especially when output amplitudes exceed power supply voltage limits.
Innovation Solution
A phase interpolator circuit that includes a first and second signal generation circuit, a delay circuit, a detection circuit, an optimum delay amount obtaining circuit, and an amplitude adjustment circuit, which generates and adjusts the amplitude of a third periodic signal to ensure it falls within a predetermined range, independent of frequency variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phase interpolator synthesizes high-frequency periodic signals, then the phase interpolation capability is improved, but the amplitude variations cause waveform information loss and impaired phase interpolation
Solution Approach 1:
The patent implements a feedback mechanism where the detected amplitude of the synthesized periodic signal is fed back to the amplitude adjustment circuit. This circuit dynamically adjusts the amplitude of the synthesized signal to maintain it within a predetermined range, preventing waveform information loss while preserving phase interpolation accuracy.
Solution Approach 2:
The patent replaces traditional amplitude stabilization methods with an electronic detection and adjustment system. The detection circuit electronically monitors the amplitude of the synthesized signal, and the amplitude adjustment circuit electronically modifies it, substituting mechanical or manual amplitude control mechanisms.
2Power
If the output amplitude of the synthesized signal is increased to improve signal strength, then the signal power is improved, but the amplitude exceeds power supply voltage limits causing waveform distortion
Solution Approach 1:
The patent employs dynamic amplitude adjustment where the amplitude of the synthesized signal is continuously adapted based on detection feedback. The amplitude adjustment circuit dynamically modifies the signal amplitude in real-time to maintain it within safe limits, preventing waveform distortion while optimizing signal power.
Solution Approach 2:
The patent changes the amplitude parameter of the synthesized signal dynamically. By adjusting the amplitude parameter based on detection results, the system maintains the signal within acceptable ranges, preventing harmful waveform distortion while preserving adequate signal power for operation.
3Device complexity
If the amplitude of the synthesized periodic signal is not controlled, then the circuit complexity is reduced, but the amplitude variations lead to lost waveform information
Solution Approach 1:
The patent introduces an intermediary detection circuit between the signal synthesis stage and the output stage. This detection circuit monitors the amplitude of the synthesized signal and provides feedback to the amplitude adjustment circuit, acting as an intermediary that enables controlled amplitude management without significantly increasing overall system complexity.
Data Source
AI summary
A third periodic signal is synthesized using a first output signal having a phase corresponding to a first periodic signal and a second output signal having a phase corresponding to the second periodic signal. A value of the third periodic signal is detected at a timing of the phase of the delayed first periodic signal. The value of the third periodic signal detected with the delayed first periodic signal is compared with the value of the third periodic signal detected by the first periodic signal delayed by the different delay amount. The delay amount is obtained for the detected third periodic signal being a maximum or a minimum. In a state of the optimum delay amount, an amplitude of the third periodic signal is adjusted so that the detected value of the third periodic signal falls within a predetermined range.