Signal Driving Circuit With Delayed Clock Control for Hold Margins
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Solution Overview
Problem
Existing semiconductor devices face challenges in accurately transmitting signals due to process, voltage, and temperature variations, leading to insufficient setup and hold margins, especially at high operating speeds, which affect the reliability and accuracy of signal transmission.
Innovation Solution
A signal driving circuit with a first driver and a control signal generation circuit that generates delayed and complementary control clock signals to adjust pulse widths based on process variations, ensuring accurate signal transmission by synchronizing drivers with these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common transmitter and driver output signals based on clock signal during enabled interval, then the device complexity is low, but the reliability of signal transmission deteriorates due to insufficient setup and hold margins under process variations
Solution Approach 1:
The driver circuit is segmented into a first driver and a second driver. The first driver generates a first transmission signal based on the clock signal, while the second driver generates a second transmission signal based on a delayed clock signal. This segmentation allows independent optimization of each driver's timing characteristics, improving setup and hold margins without requiring complete redesign of the transmission circuit.
Solution Approach 2:
A delay circuit is introduced to generate a delayed clock signal in advance. The second driver uses this pre-delayed clock signal to generate the second transmission signal, which arrives at the receiver at the optimal time. This preliminary timing adjustment ensures that signals are transmitted with sufficient margins against process variations.
2Productivity
If the clock signal interval is reduced to increase operating speed, then the productivity increases, but the setup and hold margins become insufficient leading to transmission errors
Solution Approach 1:
The system dynamically adjusts timing relationships between transmission signals by introducing a controlled delay to the clock signal for the second driver. This dynamic timing adjustment allows the circuit to maintain adequate setup and hold margins even when the overall clock interval is reduced for high-speed operation, preventing transmission errors while maximizing productivity.
3Reliability
If process variations are compensated by increasing timing margins, then the reliability improves, but the operating speed decreases due to larger time intervals required
Solution Approach 1:
Different timing characteristics are applied locally to different signal paths. The first driver uses the original clock signal timing, while the second driver uses a delayed clock signal timing. This local differentiation allows each path to be optimized for its specific timing requirements, maintaining high operating speed while providing sufficient margins to compensate for process variations.
Data Source
AI summary
A signal driving circuit includes a first driver, a control signal generation circuit, and a second driver. The first driver is configured to generate a first transmission signal based on an input signal and a clock signal. The control signal generation circuit is configured to generate a delay clock signal by delaying the clock signal and to generate a first control clock signal and a second control clock signal with different pulse widths than the pulse width of the delay clock signal. The second driver is configured to generate a second transmission signal, based on the first transmission signal and the first and second control clock signals.