Sense Amplifier Flip-Flop With Dynamic Bridge Power Reduction
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Solution Overview
Problem
Existing flip-flops designed for high operating speed consume high power, which is inefficient and leads to increased power consumption in integrated circuits.
Innovation Solution
A sense amplifier flip-flop is designed with a first stage that generates latch signals by pulling down pull-down nodes based on data inputs, and a second stage that generates a data output. This design includes a bridge circuit that electrically connects the pull-down nodes only when necessary, reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a flip-flop is designed to have a high operating speed, then the operating speed is improved, but the power consumption increases
Solution Approach 1:
The bridge circuit is dynamically controlled to connect the first pull-down node and second pull-down node only when the data input transitions while the clock signal is logic high. This dynamic connection reduces unnecessary power consumption during stable states while maintaining high operating speed during transitions.
Solution Approach 2:
The bridge circuit activates periodically only during clock high periods when data transitions occur, rather than continuously. This periodic activation reduces average power consumption while ensuring the flip-flop operates at high speed when needed.
2Speed
If the bridge circuit is always activated to connect pull-down nodes, then the operating speed is improved, but the power consumption increases
Solution Approach 1:
The bridge circuit transitions from a static always-on design to a dynamic controlled design, activating only when data transitions occur during clock high periods. This eliminates continuous power consumption while maintaining fast latch signal generation when transitions happen.
Solution Approach 2:
The activation state of the bridge circuit is changed from a constant parameter to a variable parameter controlled by the control circuit. The circuit monitors data input transitions and clock signal state to dynamically adjust the bridge circuit activation, optimizing both speed and power consumption.
Data Source
AI summary
A sense amplifier flip-flop includes a first stage configured to generate, in response to a rising edge of a clock signal, a first latch signal and a second latch signal by pulling down a first pull-down node or a second pull-down node according to a data input and an inverted data input, wherein the first stage includes a bridge circuit configured to electrically connect the first pull-down node and the second pull-down node to each other in response to an activated bridge signal, and a control circuit configured to activate the bridge signal when the data input transitions while the clock signal is logic high.