Pulse Generation Logic Circuit for Stable Flip-Flop Timing
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Solution Overview
Problem
Conventional pulse generation circuits in semiconductor ICs are susceptible to process variations during fabrication, leading to inconsistent pulse widths, which affect the set-up and hold times of pulsed flip-flops, resulting in increased current consumption and performance variability.
Innovation Solution
A pulse generation circuit comprising a dispersed arrangement of storage elements and delay elements on a substrate, with a pulse generation logic circuit that performs logic operations on clock and delayed signals to generate a pulse signal, using a combination of OR and AND gates, and optionally a selection circuit to stabilize pulse width across fabrication variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional pulse generation circuit uses a single delay element to generate pulse signals, then the circuit structure is simple, but the pulse width varies due to process variations leading to inconsistent set-up and hold times
Solution Approach 1:
The single delay element is segmented into multiple delay elements (first delay element and second delay element) with different delay amounts. Each delay element processes the clock signal independently to generate delayed signals that are then combined through logic operations. This segmentation allows the system to compensate for process variations by selecting appropriate delay combinations, thereby maintaining consistent pulse width across different operating conditions while keeping individual delay elements relatively simple.
2Reliability
If the pulse width is adjusted to accommodate process variations, then the set-up and hold times become more consistent, but the circuit complexity increases
Solution Approach 1:
The pulse generation circuit incorporates dynamic selection capability through logic operation units that can selectively combine delayed signals from different delay elements based on operating conditions. The circuit dynamically adjusts which delayed signals are combined to generate the pulse signal, allowing adaptation to process variations without requiring a completely complex fixed structure. This dynamic approach achieves consistent timing while maintaining reasonable circuit complexity.
Solution Approach 2:
The logic operation units serve multiple functions: they combine delayed signals from different delay elements, select appropriate signal combinations based on operating conditions, and generate pulse signals with consistent width. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby achieving reliable timing consistency without proportionally increasing overall circuit complexity.
3Speed
If conventional pulsed flip-flops are used for high-speed data processing, then the data processing speed is improved, but the current consumption increases
Solution Approach 1:
The circuit changes the timing parameters of the pulse signal by adjusting the combination of delayed signals from multiple delay elements. By optimizing the pulse width and timing characteristics through parameter adjustment rather than increasing operating frequency, the circuit achieves high-speed data processing while controlling current consumption. The logic operation units enable flexible parameter adjustment without requiring higher frequency operation.
Data Source
AI summary
A pulse generation circuit includes storage elements disposed in a dispersed arrangement on a substrate and operating in response to a pulse signal, delay elements each proximate to a storage element receiving a clock signal and providing a delayed output signal, and a pulse generation logic circuit performing at least one logic operation on the clock signal and the plurality of delayed output signals to generate the pulse signal.