Shared-Architecture RC Oscillator for Low-Cost Stable Clocking
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Solution Overview
Problem
The existing RC oscillators are not cost-effective, which is a challenge in the rapidly growing consumer market for microcontroller units, requiring a design that balances low cost and high performance without introducing side effects.
Innovation Solution
An RC oscillator with a shared circuit architecture that includes a current mirror circuit, a comparator circuit, a bias voltage generator, and a clock buffer, where the bias voltage generator shares components with the comparator circuit to optimize performance and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional RC oscillator architecture is used, then clock frequency generation is achieved, but circuit complexity and cost increase
Solution Approach 1:
The patent merges the bias voltage generator circuit with the comparator circuit by sharing the resistor R1 and capacitor C1 components. This integration reduces the total component count and circuit complexity while maintaining the functional independence and performance stability of both circuits through proper coupling design.
Solution Approach 2:
The resistor R1 and capacitor C1 serve dual functions: they are used by the comparator circuit for voltage comparison operations and simultaneously by the bias voltage generator for establishing stable operating points. This multi-functionality reduces component redundancy and lowers overall circuit complexity.
2Reliability
If more components are used to improve performance, then oscillator functionality is enhanced, but manufacturing cost increases
Solution Approach 1:
By combining the bias voltage generator and comparator circuits into a shared architecture, the patent reduces the total number of discrete components that need to be manufactured and assembled. This sharing of R1, C1, and associated transistors directly reduces bill of materials cost and assembly complexity while preserving full oscillator functionality.
Solution Approach 2:
The shared components R1 and C1 perform multiple functions within the oscillator system, eliminating the need for separate dedicated components for each function. This universality reduces the overall component count and manufacturing cost while maintaining performance requirements.
Data Source
AI summary
A resistor-capacitor (RC) oscillator with shared circuit architecture includes a current mirror circuit, a comparator circuit, a bias voltage generator, and a clock buffer. The current mirror circuit utilizes a plurality of transistors to perform current control, to adjust a second current on a second current path according to a first current on a first current path. The comparator circuit includes a first transistor, a second transistor, a resistor, and a capacitor, wherein a comparison result signal generated by the comparator circuit corresponds to a voltage of the capacitor. The bias voltage generator generates a bias voltage as a comparator reference voltage between the first transistor and the resistor. The clock buffer buffers the comparison result signal to generate an output signal. The bias voltage generator at least shares the resistor with the comparator circuit, and the RC oscillator may achieve targets of low cost and high performance.