Semi-Dynamic Flip-Flop Circuit With Clock Glitch Prevention
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Solution Overview
Problem
Integrated circuits face long delays and increased power consumption due to glitches in sequential circuits, particularly in semi-dynamic flip-flops, which occur based on the discharge speeds of static circuits.
Innovation Solution
A flip-flop design incorporating a first precharge circuit, discharge circuits, inverters, and a switching prevention circuit to manage node voltages and reduce power consumption, while enhancing data retention time and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a semi-dynamic flip-flop is used to reduce delay, then operational speed is improved, but glitches occur causing increased power consumption
Solution Approach 1:
A switching prevention circuit is introduced as an intermediary component between the clock signal and the flip-flop nodes. This circuit mediates the clock signal's effect on nodes, preventing direct toggling that causes glitches while maintaining the speed benefits of semi-dynamic operation. The switching prevention circuit acts as a buffer that filters out harmful clock-induced transitions.
Solution Approach 2:
The switching prevention circuit performs preliminary anti-action by preemptively blocking the clock signal from causing unwanted voltage transitions before glitches can occur. By anticipating and preventing the harmful effect of clock toggling on node voltages, the circuit eliminates the root cause of glitch-induced power consumption while preserving operational speed.
2Productivity
If the discharge speed of the static circuit is increased, then operational frequency is improved, but glitches occur more frequently
Solution Approach 1:
The switching prevention circuit serves as an intermediary between the fast-discharging static circuit and the clock signal. It allows the static circuit to maintain high discharge speed for improved operational frequency while filtering out the harmful effects of rapid discharge that would otherwise cause glitches. The circuit mediates between speed and stability requirements.
3Speed
If more transistors interact with the clock signal, then data retention time is reduced, but operational speed is improved
Solution Approach 1:
The switching prevention circuit extracts and removes the harmful clock signal interactions from the flip-flop nodes. By taking out the detrimental effect of clock toggling on node voltages, the circuit allows data to be retained longer without being prematurely overwritten by clock-induced transitions, while still permitting necessary clock-driven operations to proceed at high speed.
Data Source
AI summary
A flip-flop includes a first precharge circuit, a first discharge circuit, a first inverter, a second discharge circuit, a second precharge circuit, a third discharge circuit, and a switching prevention circuit. The first precharge circuit selectively charges a first node based on a data input signal and a clock signal. The first discharge circuit selectively discharges the first node based on the data input signal. The first inverter outputs a first inverted signal by inverting a first signal of the first node. The second discharge circuit selectively discharges the second node based on the clock signal. The third discharge circuit selectively discharges the fourth node based on the clock signal, the first inverted signal and the second signal. The switching prevention circuit prevents a switching of a voltage level of the second node based on the first signal, due to a toggling of the clock signal.