Replica Clock Adjustment Circuit for PVT Timing Mismatch
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Solution Overview
Problem
Semiconductor memory devices face reduced operational ability due to variations in clock propagation time caused by process, voltage, and temperature fluctuations, leading to desynchronization of internal clocks with data signals.
Innovation Solution
Implementing a replica clock adjustment circuit that mirrors the operation of the clock adjustment circuitry to measure and adjust for additional delays introduced by PVT influences, using a clock adjustment circuitry replica with a swing oscillator driver to align input swing values with the original circuit, ensuring accurate synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the device complexity increases to perform more operations, then the operational ability improves, but the clock propagation time variation increases causing synchronization issues
Solution Approach 1:
The patent measures the actual clock propagation time in advance through a measurement circuit that determines the time from a clock signal input to an internal node. This measured value is stored and used to calculate a compensation value before operations are executed, allowing the system to pre-adjust for timing variations caused by device complexity and PVT conditions.
Solution Approach 2:
The patent dynamically adjusts the clock timing parameter by calculating a compensation value based on measured propagation time and PVT conditions. This compensation value modifies the clock signal timing to compensate for variations, maintaining synchronization reliability even as device complexity increases and more operations are performed.
2Adaptability or versatility
If process, voltage, and temperature variations occur, then the device adapts to different conditions, but the clock propagation time accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the measurement circuit continuously monitors actual clock propagation time under varying PVT conditions. This measured feedback is used to calculate compensation values that adjust the clock timing, creating a closed-loop system that maintains accuracy despite process, voltage, and temperature variations.
Solution Approach 2:
The patent uses a measurement circuit that replicates the clock signal path to measure actual propagation time. By creating a copy of the timing path for measurement purposes, the system can accurately determine real propagation delays without interfering with the main signal path, enabling precise compensation under different PVT conditions.
3Measurement precision
If a replica clock adjustment circuit is implemented to measure delays, then the synchronization accuracy improves, but the device complexity increases
Solution Approach 1:
The patent implements a measurement circuit that copies the essential timing path of the clock signal to measure propagation delay. This replica measurement path allows accurate delay characterization without requiring a complete duplicate of the entire clock distribution network, balancing measurement precision with acceptable circuit complexity.
Solution Approach 2:
The measurement circuit is designed to serve multiple functions: it measures clock propagation time, determines compensation values, and adapts to different PVT conditions. By making the measurement circuit multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while maintaining measurement precision.
Data Source
AI summary
Systems and techniques to offset conditions affecting propagation delay of a clock signal in a memory device. These include a device that includes a clock adjustment circuit, comprising a differential amplifier, an inverter coupled to a first output of the differential amplifier, and a swing oscillator driver coupled to a second output of the inverter and an input of the differential amplifier. The swing oscillator driver includes a series of transistors, a signal path coupled to at least a first transistor of the series of transistors, wherein the signal path when in operation transmits a signal having a first voltage, and a strength control circuit coupled to the signal path, wherein the strength control circuit when in operation adjusts the first voltage of the signal to a second voltage.