Capacitor Oscillator Circuit With Exponential Frequency Scaling
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Solution Overview
Problem
Oscillator circuits face challenges in maintaining frequency stability over voltage-temperature corners, with existing solutions like PLLs requiring larger circuit areas and ring oscillators exhibiting high frequency variation, which affects efficiency in various applications.
Innovation Solution
An oscillator circuit with capacitors that adjusts oscillation frequency as a non-linear function of an input control signal, using a control circuit to set the frequency by adjusting capacitance and resistance, and a switching circuit that alternates modes based on capacitor charging and discharging, allowing for exponential frequency scaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PLLs are used to generate accurate oscillating signals, then frequency stability is improved, but circuit area increases
Solution Approach 1:
The patent extracts only the essential frequency control functionality from complex PLL systems, implementing a simplified oscillator that achieves frequency stability through direct digital control of capacitance and resistance parameters without requiring the full PLL architecture, thereby reducing circuit area while maintaining reliability
Solution Approach 2:
The patent changes the control parameters from analog voltage control to digital control of capacitance and resistance values, allowing precise frequency adjustment through discrete parameter steps that achieve stability without the complex continuous control mechanisms of PLLs
2Area of stationary object
If ring oscillators are used to generate clock signals, then circuit area is reduced, but frequency variation increases
Solution Approach 1:
The patent implements dynamic adjustment of capacitance and resistance parameters in real-time based on operating conditions, allowing the oscillator to adapt its frequency characteristics dynamically to maintain stability across voltage and temperature variations while keeping the compact ring oscillator structure
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the actual oscillation frequency and adjust the control parameters accordingly, enabling the compact oscillator to compensate for frequency variations and maintain stability without requiring the larger PLL architecture
3Device complexity
If oscillation frequency is adjusted linearly with control signal, then circuit simplicity is maintained, but frequency adjustment range is limited
Solution Approach 1:
The patent transitions from linear control to exponential frequency scaling by introducing a non-linear relationship between the digital control signal and the output frequency, achieving wide frequency adjustment range while maintaining relatively simple circuit architecture through dimensional transformation of the control function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient frequency adjustment over a wide range with reduced circuitry, improving power efficiency and accommodating load variations, while maintaining stability across different conditions.
Implementation Method 1
an oscillator circuit having one or more capacitors. The oscillator circuit is configured to generate an oscillating signal by repeated charging and discharging of the capacitors
Implementation Method 2
adjusting resistance of a current path used to charge the capacitors
Data Source
AI summary
Aspects of various embodiments of the present disclosure are directed to applications utilizing oscillator circuits. In certain embodiments, an apparatus includes an oscillator circuit having one or more capacitors. The oscillator circuit is configured to generate an oscillating signal by repeated charging and discharging of the capacitors. The apparatus also includes a control circuit connected to the oscillator. The control circuit is configured to set the oscillation frequency of the oscillator circuit as a non-linear function of an input control signal. For instance, in a more specific embodiment, the control circuit may be configured to set oscillation frequency of the oscillator circuit to a frequency scaled by a value raised to an exponent specified by the input control signal.