Phase Interpolator Post-Distortion Linearization for PVT Accuracy
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Solution Overview
Problem
Variations in process, voltage, and temperature can undesirably distort the phase of clock signals in electronic devices, affecting timing and synchronization.
Innovation Solution
A phase correction circuitry that adjusts clock signals with pre-determined delay values to compensate for distortions, using a programmable delay circuit and a storage device to store delay values determined during manufacturing or dynamically adjusted based on environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase interpolator is used to generate clock signal with desired phase value, then phase adjustment capability is improved, but phase accuracy deteriorates due to PVT variations
Solution Approach 1:
The patent pre-determines distortion compensation values during manufacturing or calibration before the device operates. These compensation values are stored in a lookup table and applied in advance to counteract PVT variations, ensuring phase accuracy is maintained without requiring real-time complex calculations.
Solution Approach 2:
The patent implements a feedback mechanism where the actual phase output is monitored and compared against the desired phase value. Based on this feedback, the system adjusts the distortion compensation values dynamically to maintain phase accuracy under varying PVT conditions.
2Measurement precision
If distortion compensation is applied to improve phase accuracy, then phase value accuracy is improved, but device complexity increases
Solution Approach 1:
The patent pre-determines distortion compensation values during manufacturing or calibration before the device operates. These compensation values are stored in a lookup table and applied in advance to counteract PVT variations, ensuring phase accuracy is maintained without requiring real-time complex calculations.
Solution Approach 2:
The patent changes the operating parameters of the phase interpolator by applying pre-determined distortion compensation values. These compensation values adjust the phase output characteristics to maintain linearity and accuracy across PVT variations without fundamentally changing the circuit architecture.
3Measurement precision
If dynamic calibration is performed to improve phase accuracy, then phase accuracy is improved, but time consumption increases
Solution Approach 1:
The patent pre-determines distortion compensation values during manufacturing or calibration before the device operates. These compensation values are stored in a lookup table and applied in advance to counteract PVT variations, ensuring phase accuracy is maintained without requiring real-time complex calculations.
Data Source
AI summary
The current disclosure is directed to a phase interpolator (PI) with phase correction circuitry. The phase interpolator may generate a clock signal with a phase value. The phase correction circuitry may adjust the phase value of the clock signal to compensate for at least a portion of the undesired distortions. The phase correction circuitry may store pre-determined delay values to at least partially compensate for the undesired distortions of the clock signal based on the control signals. The phase correction circuitry may output the clock signal, as adjusted, with improved phase value accuracy and/or clock signal linearity. In some cases, the phase correction circuitry may improve operations of the phase interpolator, or an electronic system including the phase interpolator, across variations in process, voltage, and/or temperature.