Programmable RC Delay Element With Feedback Bypass Timing Control
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Solution Overview
Problem
In digital circuits, frequency-induced delay variations occur due to the finite and non-uniform signal propagation times caused by parasitic capacitance, inductance, and resistance, leading to unpredictable signal arrival times, which traditional RC network-based delay elements cannot adequately address, especially at high frequencies.
Innovation Solution
A programmable delay element utilizing a feed-forward and feedback control mechanism to dynamically adjust the reactive circuit elements, allowing for full-scale signal voltage transitions and reducing frequency-induced delay variations by effectively bypassing reactive elements, thus enabling faster and more predictable signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RC network-based delay elements are used to adjust signal timing, then signal propagation delay can be controlled, but frequency-induced delay variations increase and operational speed decreases
Solution Approach 1:
The patent implements a feedback control mechanism where the output signal is fed back to the control input through a buffer. This feedback loop dynamically adjusts the delay by comparing the actual output with the expected delay, compensating for frequency-induced variations and maintaining predictable timing across different operating conditions
Solution Approach 2:
The patent transitions from static RC networks to a dynamic control system where delay is adjusted in real-time based on operating conditions. The feedback mechanism enables the delay element to adapt dynamically to frequency changes, temperature variations, and process deviations, maintaining consistent timing behavior
2Productivity
If clock cycle period is reduced to increase operational speed, then more logical functions can be performed rapidly, but signal propagation time becomes insufficient and reliability decreases
Solution Approach 1:
The patent employs dynamic delay adjustment that adapts to different clock frequencies. As the clock cycle period decreases, the feedback control mechanism adjusts the delay element parameters in real-time to ensure signals still settle reliably within the shortened period, maintaining both high throughput and signal reliability
3Reliability
If adjustable delay elements are inserted in signal paths to synchronize signal arrival, then signal timing can be controlled, but device complexity increases
Solution Approach 1:
The patent creates a universal delay control mechanism that can be applied to multiple signal paths throughout the digital circuit. The feedback-based delay element serves multiple functions: timing adjustment, synchronization, and frequency compensation, replacing multiple separate delay elements and simplifying the overall circuit architecture
Solution Approach 2:
The delay element incorporates self-adjustment through the feedback mechanism, automatically compensating for timing variations without requiring external control logic. The system uses its own output signal to regulate its delay, eliminating the need for complex external timing control circuits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The programmable delay element significantly reduces the time required for signal voltage to reach steady-state, achieving full-scale transitions even with longer delays, thereby minimizing frequency-induced delay variations and enhancing operational speed in digital circuits.
Implementation Method 1
a feedback element that is responsive to a third control signal, wherein the passive circuit elements are coupled to the signal node in response to the second control signal
Data Source
AI summary
A programmable delay element with a variable delay generator employs feed forward and feedback control signals to corresponding feed forward and feedback control elements integrated within the variable delay generator. The variable delay generator is responsive to a control signal. The variable delay generator uses transfer switches to couple reactive circuit elements to a signal node in accordance with the control signal. The feed forward element couples a fixed voltage to corresponding nodes of the feed back element. The feedback element completes a bypass circuit to apply the fixed voltage to the signal node once the programmable delay element has delayed a source signal. The feed forward element is responsive to a buffered version of the source signal. The feedback element is responsive to a buffered version of the output of the delay element. A corresponding method for reducing frequency induced delay variation in a programmable delay element is disclosed.