Digitally Controlled Oscillator Tuning to Avoid Phase Noise Spikes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional digitally controlled oscillators experience significant deterioration in phase noise characteristics for specific tuning word values, leading to increased spurious components and degraded jitter characteristics in data communication systems.
Innovation Solution
A digitally controlled oscillator with a determination unit that identifies input data causing phase noise deterioration, an offset unit that adjusts the input data, and a generating unit that produces the output frequency using offset data to prevent phase noise degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional digitally controlled oscillators use standard tuning word input, then the device complexity remains simple, but phase noise characteristics deteriorate significantly for specific tuning word values
Solution Approach 1:
The determination unit performs preliminary detection of tuning words that would cause phase noise deterioration before the oscillator generates the output signal. By identifying problematic tuning words in advance and preventing their use, the system avoids phase noise issues without requiring complex real-time correction mechanisms during oscillation.
Solution Approach 2:
The determination unit acts as an intermediary between the tuning word input and the oscillator core. It filters and validates input tuning words, blocking those that would cause phase noise deterioration while allowing valid tuning words to pass through to the oscillator, thus protecting the system from harmful inputs.
2Reliability
If the oscillator processes all input tuning words without verification, then the ease of operation is high, but spurious components increase and jitter characteristics degrade
Solution Approach 1:
The determination unit provides feedback on the validity of input tuning words before they are processed by the oscillator. This feedback mechanism ensures that only tuning words that will produce acceptable jitter characteristics are allowed to proceed, maintaining high reliability while keeping the operation straightforward for users.
3Reliability
If no determination unit is added to verify tuning words, then the device complexity remains low, but phase noise deterioration occurs for specific input values
Solution Approach 1:
The determination unit performs preliminary detection of tuning words that would cause phase noise deterioration before the oscillator generates the output signal. By identifying problematic tuning words in advance and preventing their use, the system avoids phase noise issues without requiring complex real-time correction mechanisms during oscillation.
Solution Approach 2:
The determination unit acts as an intermediary between the tuning word input and the oscillator core. It filters and validates input tuning words, blocking those that would cause phase noise deterioration while allowing valid tuning words to pass through to the oscillator, thus protecting the system from harmful inputs.
Data Source
AI summary
A digitally controlled oscillator that generates an output frequency according to input data includes a determination unit that determines whether the input data has a value that causes deterioration in a phase noise characteristic of the digitally controlled oscillator, an offset unit that offsets the input data when the input data is determined to have the value that causes deterioration in the phase noise characteristic, and a generating unit that generates the output frequency using the input data after being offset.