Adaptive Oscillator Clocking for Power Supply Noise Tracking
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Solution Overview
Problem
Clock generator circuits face instability due to noise on the power supply line, leading to fluctuations in the system clock signal, which can cause functional failures in integrated circuits, and existing compensation methods are either slow to detect noise or inefficient in terms of power consumption.
Innovation Solution
An adaptive oscillator circuit that automatically adjusts the output clock frequency in response to noise on the power supply line by using a Frequency Lock Loop and delay lines powered by both a regulated and a droopy power supply, allowing the clock frequency to track voltage changes and maintain timing margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-step noise detection and compensation process is used, then clock signal stability is improved, but response speed deteriorates due to the sequential nature of detection and notification
Solution Approach 1:
The patent combines the noise detection function and clock frequency adjustment function into a single integrated oscillator circuit. The oscillator directly responds to power supply voltage variations by automatically adjusting its output frequency, eliminating the need for separate detection and compensation steps. This merging of functions enables real-time response to noise while maintaining clock stability.
2Reliability
If margins are added to the power supply voltage to cover fluctuations, then clock circuit timing reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements a dynamic power supply voltage adjustment mechanism where the oscillator circuit automatically modifies its operating voltage in real-time based on actual noise conditions. Instead of maintaining a constantly elevated voltage margin, the system dynamically raises voltage only when noise is detected and returns it to normal levels when conditions are stable, thereby ensuring timing reliability while minimizing unnecessary power consumption.
3Measurement precision
If noise detection sensitivity is increased to detect transient noise, then detection accuracy is improved, but detection time increases making it difficult to catch nanosecond-level noise
Solution Approach 1:
The patent employs a feedback mechanism where the oscillator circuit continuously monitors power supply voltage conditions and immediately adjusts its output frequency in response to detected variations. This closed-loop feedback enables the system to detect and respond to transient noise events in real-time without requiring extended detection periods, maintaining both high detection accuracy and rapid response capability.
Data Source
AI summary
An output clock frequency of an adaptive oscillator circuit changes in response to noise on an integrated circuit power supply line. The circuit features two identical delay lines which are separately connected to a regulated supply and a droopy supply. In response to noise on the droopy supply, the delay lines cause a change in the output clock frequency. The adaptive oscillator circuit slows down the output clock frequency when the droopy supply droops or falls below the regulated supply. The adaptive oscillator circuit clamps the output clock frequency at a level determined by the regulated supply when the droopy supply overshoots or swings above the regulated supply.