Digitally Controlled Oscillator With Feedback Power Compensation
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Solution Overview
Problem
Existing digitally controlled oscillators face challenges in accurately controlling frequency generation while maintaining a reduced layout area, as they are often large and prone to environmental and manufacturing errors.
Innovation Solution
A digitally controlled oscillator with a digital control unit that compensates for differences between feedback and reference powers, using a power level setting unit and power level compensation unit to generate an output clock with precise frequency control, and a power control oscillation unit that adjusts oscillation frequency based on the output power, incorporating a sigma-delta modulator for coefficient modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large layout area is used for the oscillator, then frequency generation accuracy is improved, but the device occupies more space
Solution Approach 1:
The patent changes the control parameter from analog voltage to digital control signals, enabling precise frequency control through digital values. The digitally controlled oscillator uses N-bit digital control signals to select from 2^N different frequency values, achieving high precision without requiring large analog component values. This parameter transformation resolves the contradiction by maintaining accuracy while reducing physical layout area.
Solution Approach 2:
The patent replaces traditional analog oscillator circuits with digitally controlled oscillation circuits. Instead of using large analog components (capacitors, inductors, resistors) to achieve frequency stability, the invention uses digital logic circuits and lookup tables to generate precise frequencies. This substitution of mechanical/analog systems with digital systems significantly reduces layout area while maintaining or improving frequency generation accuracy.
2Ease of operation
If traditional oscillator design is used, then frequency control is achieved, but the device is sensitive to environmental and manufacturing errors
Solution Approach 1:
The patent implements feedback mechanisms where the oscillator output is monitored and used to adjust control parameters. The digitally controlled oscillator uses feedback from the actual oscillation frequency to correct deviations caused by environmental changes. This closed-loop control improves reliability by compensating for manufacturing variations and environmental effects, while maintaining ease of digital frequency control.
Solution Approach 2:
The patent performs preliminary calibration and compensation for environmental and manufacturing errors during the design and manufacturing process. Lookup tables and correction algorithms are pre-computed to compensate for known variations. This preliminary action reduces sensitivity to environmental and manufacturing errors while maintaining simple digital frequency control operation.
3Measurement precision
If high precision frequency control is implemented, then oscillation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the frequency control into multiple independent components: a frequency selection unit that receives N-bit digital control signals to select from 2^N frequency values, and a separate compensation unit that corrects for environmental variations. This segmentation allows high precision frequency control while managing device complexity by dividing functions into modular, manageable units with clear interfaces.
Data Source
AI summary
Provided are a digitally controlled oscillator and an electronic device including the digitally controlled oscillator. The digitally controlled oscillator includes a digital control unit and a power control oscillation unit. The digital control unit compensates for a difference between a feedback signal of an output power and a reference power set based on an input digital control signal and outputting an output power. The power control oscillation unit receives a signal related to the output power, and generates an output clock having an oscillation frequency in response to the signal related to the output power.