Oscillator Circuit Temperature Compensation via Differential Amplifier
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Solution Overview
Problem
Conventional oscillator circuits experience frequency drift due to temperature variations, which is a significant issue in analog-to-digital and time-to-digital converters, as they lack temperature compensation.
Innovation Solution
The proposed oscillator circuit incorporates a fully differential amplifier, a current mirror unit, a bias current supplying unit, a compensation unit, and a reference signal generating unit to maintain a stable oscillator frequency despite temperature changes, utilizing MOSFETs and source resistors to adjust clamping currents based on temperature parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oscillator circuits are used without temperature compensation, then the circuit structure remains simple, but frequency drift occurs due to temperature variation
Solution Approach 1:
The oscillator circuit is divided into functionally independent modules: a fully differential amplifier unit, a current mirror unit, a bias current supplying unit, a compensation unit, and a reference signal generating unit. Each module performs a specific function, allowing the temperature compensation mechanism to be added without completely redesigning the oscillator, thus improving frequency stability while controlling overall complexity.
Solution Approach 2:
A compensation unit is introduced as an intermediary component between the oscillator core and the temperature variations. This compensation unit receives temperature information and generates compensating signals that counteract the temperature-induced frequency drift, acting as a mediator that isolates the oscillator core from temperature effects.
2Reliability
If temperature compensation components are added to the oscillator circuit, then frequency drift is prevented, but the circuit complexity increases
Solution Approach 1:
The fully differential amplifier is designed to serve multiple functions: it acts as the core oscillation generator, provides temperature sensing capability, and generates signals for the compensation unit. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in circuit complexity while achieving temperature compensation.
Solution Approach 2:
The compensation unit and reference signal generating unit are integrated with the current mirror unit and bias current supplying unit to form a unified temperature compensation system. By merging these functions into a coordinated system rather than separate independent components, the overall circuit complexity is optimized while maintaining effective frequency stability.
Data Source
AI summary
Disclosures of the present invention particularly describe oscillator circuit with temperature compensation function, consisting of a fully differential amplifier, a current mirror unit, a bias current supplying unit, a compensation unit, and a reference signal generating unit. A variety of experimental data have proved that, based on the normal operation of the compensation unit and the reference signal generating unit, an oscillation frequency of this oscillator circuit would be maintained at same level even if the ambient temperature continuously increases. Therefore, because the frequency drift due to temperature variation would not occur in the oscillator circuit of the present invention, the novel oscillator circuit is potential oscillator to replace the conventional oscillators applied in analog-to-digital convertors or time-to-digital convertors.