Clock Generation Circuit With PVT-Compensated Supply Voltage
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Solution Overview
Problem
Integrated circuits require stable clock signals with constant frequency despite variations in process, voltage, and temperature (PVT), while maintaining low power consumption and cost-effective configurations.
Innovation Solution
A clock generation circuit comprising a reference voltage generator, bias circuit, voltage generator, and oscillation circuit that generate currents with complementary temperature characteristics to stabilize the supply voltage and maintain a constant frequency of the clock signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage generation is used in oscillators, then circuit simplicity is maintained, but frequency stability under PVT variations deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the voltage generator continuously monitors and adjusts the supply voltage based on PVT variations. The oscillator frequency is fed back to control the voltage generator, which adjusts the supply voltage to compensate for frequency deviations caused by process, voltage, and temperature changes, thereby maintaining stable frequency output.
Solution Approach 2:
The patent dynamically changes the supply voltage parameter in response to detected frequency deviations. By adjusting the voltage level supplied to the oscillator, the system compensates for PVT-induced frequency drift without requiring complete redesign of the oscillator circuit, thus improving frequency stability while limiting complexity increase.
2Reliability
If PVT compensation mechanisms are added to maintain constant frequency, then frequency stability improves, but power consumption increases
Solution Approach 1:
The patent employs dynamic voltage adjustment where the compensation mechanism is activated only when frequency deviations are detected. The voltage generator dynamically modifies the supply voltage based on real-time oscillator performance, enabling PVT compensation while minimizing continuous power consumption compared to always-on compensation schemes.
Solution Approach 2:
The oscillator circuit performs self-diagnosis of its frequency stability and automatically triggers voltage compensation only when needed. The system monitors its own performance and activates the voltage generator selectively, reducing overall power consumption while maintaining frequency stability when required.
3Reliability
If high precision oscillators are designed to maintain constant frequency under PVT changes, then frequency stability improves, but manufacturing cost increases
Solution Approach 1:
The patent divides the frequency stabilization function into separate modular components: the oscillator core, the frequency detection unit, and the voltage generator. This segmentation allows standard manufacturing processes for each module while achieving high overall frequency stability through their coordinated operation, reducing manufacturing complexity and cost compared to monolithic high-precision oscillator designs.
Data Source
AI summary
A clock generation circuit includes a reference voltage generator configured to generate a first current having a current value inversely proportional to a reference voltage and a temperature, a bias circuit configured to generate a bias current, a second current having a current value proportional to the temperature, and a third current based on the reference voltage, a voltage generator configured to generate a supply voltage based on the first current, the bias current, and the second current, and an oscillation circuit configured to generate a clock signal having a constant frequency based on the supply voltage and the third current, wherein the supply voltage is generated to have a slope based on a ratio of the first current to the second current.