Dynamic Ring Oscillator Topology for Precise Delay Measurement
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Solution Overview
Problem
Conventional ring oscillators with an odd number of inversion stages are constrained in their applications, limiting their effectiveness in certain scenarios due to their static nature.
Innovation Solution
A dynamic ring oscillator with multiple non-inverting domino circuits, where an even number of domino circuits are coupled in series to form a chain and subsequently a ring, allowing the output of each stage to feed the input of the next and be fed back to clock an earlier stage, enabling oscillation and providing a means to measure subtle frequency differences between N-type and P-type oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ring oscillators use an odd number of inversion stages with static circuits, then the circuit structure is simple, but the application utility is constrained and cannot effectively function in certain applications
Solution Approach 1:
The patent applies dynamic circuits instead of static circuits in the ring oscillator. The dynamic nature of the circuits allows the oscillator to be configured with an even number of stages and enables it to function in applications where conventional static ring oscillators cannot effectively operate, thereby improving adaptability without significantly increasing complexity
Solution Approach 2:
The patent changes the fundamental parameter of inversion stage count from odd (conventional) to even (innovative). This parameter change, combined with using dynamic circuits, enables the oscillator to achieve utility in previously inaccessible applications while maintaining a relatively simple circuit structure
2Measurement precision
If conventional ring oscillators are used, then the circuit design is straightforward, but subtle frequency differences and microscopic properties cannot be measured with high accuracy
Solution Approach 1:
The patent uses electrical oscillation characteristics to reveal microscopic and submicroscopic structural properties of semiconductor materials. By measuring frequency differences in dynamic ring oscillators, the system can detect relative strengths of N-type and P-type FETs at levels of accuracy that would conventionally require high precision analog apparatus
Solution Approach 2:
The patent creates complementary N-type and P-type oscillating rings that are ostensibly identical in design and fabrication. By comparing the oscillation frequencies of these complementary structures, subtle differences revealing microscopic properties can be measured with high precision
3Measurement precision
If dynamic circuits are used in ring oscillators, then measurement precision of operating delay and transistor strengths is improved, but the device complexity increases compared to static circuits
Solution Approach 1:
The dynamic ring oscillator circuit serves multiple functions: it generates oscillations for timing applications and simultaneously provides measurement capability for operating delay and transistor strength characterization. This multi-functionality justifies the increased complexity by eliminating the need for separate measurement apparatus
Data Source
AI summary
A dynamic oscillating ring circuit is described, which has multiple non-inverting domino circuits, each having a signal input, a trigger input, inputs for charge state clock and clocked cutoff and an output inverter. A number of the domino circuits are coupled in series, the output of one feeding the input of the next, to form a chain, which form stages of the ring. A number of the stages are coupled in series, the output of one feeding the input of the next, to form the ring. The first domino circuit of said chain receives a logic signal input and a single trigger input for the chain. Within the ring, the output of each stage feeds the input signal to the next stage and is fed back to clock an earlier stage to allow the ring to oscillate.