Compensated Oscillator Circuit for Stable Clock Period
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Solution Overview
Problem
Conventional oscillators experience variations in clock signal period due to voltage and temperature fluctuations, leading to erratic operation in dependent circuits as the reference voltage and current are not maintained at a constant level.
Innovation Solution
The oscillator employs a logic signal generator that produces two logic signals with the same period but different transition timings, using compensation currents to stabilize the clock signal period by compensating for variations in the reference current, thereby maintaining a constant reference voltage and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oscillator uses reference current generator and RS slope generator without compensation, then the circuit structure is simple, but the clock signal period varies with voltage and temperature changes
Solution Approach 1:
The oscillator is divided into functionally independent modules: reference current generator, RS slope generator, and compensation current generator. Each module performs a specific function, allowing the compensation mechanism to be added without completely redesigning the existing oscillator structure. The segmentation enables targeted improvement of clock period stability while maintaining overall system manageability.
Solution Approach 2:
The compensation current generator receives the reference current as input and generates a compensation current that is fed back to the RS slope generator. This feedback mechanism automatically adjusts for voltage and temperature variations by comparing the reference current level and applying the appropriate compensation, thereby stabilizing the clock signal period without requiring external intervention.
2Reliability
If reference current is not compensated for voltage and temperature variations, then the circuit operation is simple, but the reference voltage and current vary causing irregular clock period
Solution Approach 1:
The compensation current generator implements a feedback mechanism that monitors the reference current level and automatically adjusts the compensation current to maintain constant reference voltage and current despite voltage and temperature variations. This feedback loop ensures reliability of the reference parameters while managing the complexity through automated control.
Solution Approach 2:
The compensation current generator changes the compensation current parameter dynamically based on detected variations in reference current. By adjusting this parameter in response to voltage and temperature changes, the system maintains constant reference voltage and current levels, resolving the contradiction between operational simplicity and parameter stability.
Data Source
AI summary
Provided is an oscillator including a logic signal generator and a clock generator. The logic signal generator generates a first logic signal and a second logic signal that have the same period but have different logic level transition timing. The clock generator generates a clock signal in response to the first logic signal and the second logic signal. The oscillator compensates for an amount of variation of a reference current using a compensation current, thereby maintaining a constant period of the clock signal.