Flip-Flop Circuit Timing for Reduced Data-to-Clock Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flip-flops in microprocessors face limitations in reducing data-to-clock time, which restricts the increase in clock frequency and operational performance of digital circuits due to inherent delays in signal propagation.
Innovation Solution
The design of flip-flops incorporates specific circuits and logic gates that transition output signals at a falling edge of the clock signal, utilizing transistors and inverters to manage input and output signals efficiently, thereby reducing data-to-output delay and enhancing operating speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional flip-flops are used in microprocessors, then the circuit can operate with standard clock frequencies, but the data-to-clock time cannot be reduced further, limiting the increase in clock frequency and operational performance
Solution Approach 1:
The patent applies preliminary action by pre-charging the output nodes and preparing the circuit state before the clock edge arrives. The flip-flop circuit is designed to anticipate the clock transition and pre-position signals to minimize the actual propagation delay during the critical clock-to-output period, thereby reducing the effective data-to-clock time.
Solution Approach 2:
The patent employs dynamic circuit elements including differential signaling, precharge pumps, and clock-gated logic that adapt their behavior based on the clock phase. The circuit transitions between different operational states (precharge, evaluate, hold) dynamically synchronized with the clock signal, enabling faster signal propagation compared to static conventional flip-flops.
2Speed
If the data-to-output delay is shortened to increase clock frequency, then operational speed improves, but the circuit requires more complex timing control and signal synchronization
Solution Approach 1:
The patent utilizes periodic clock signals to drive the flip-flop operation, with distinct phases for precharging, evaluating, and holding data. This periodic operation simplifies timing control by providing regular, predictable windows for data capture and output, reducing the complexity of synchronization compared to asynchronous or irregular timing schemes.
Solution Approach 2:
The patent incorporates feedback mechanisms through cross-coupled logic gates and differential signaling that automatically adjust signal levels and maintain proper timing relationships. The feedback loops ensure that output signals are properly synchronized with clock edges without requiring external timing control circuitry, thereby reducing overall system complexity.
Data Source
AI summary
A flip-flop includes a first circuit receiving a clock signal and the first signal and transitioning the first and second output signals to a first level when the clock signal goes to an active level, and a second circuit transitioning the first signal to the first level after the first and second output signals go to the first level. The first circuit transfers first and second input signals to the first and second output terminals from first and second input terminals when the clock signal is at the active level and the first signal is at the first level.