OOK Modulator Jitter Reduction via Segmented Signal Path Switching
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Solution Overview
Problem
OOK modulators experience jitter due to asynchronous input data and oscillation signal timing, leading to varying delay times and degraded signal quality, and existing solutions that address this issue increase circuit size and power consumption.
Innovation Solution
A modulator design that includes an oscillator starting and stopping oscillation based on input data logic levels, a pulse generator outputting pulses when the data changes from high to low, and a signal selector switching between oscillation and pulse signals to maintain consistent phase and pulse width, reducing jitter and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two modulation paths are provided for OOK modulation to curb jitter, then jitter is reduced, but circuit size and power consumption increase
Solution Approach 1:
The modulation function is segmented into two separate paths: a first modulation path for when input data is at a first logic level, and a second modulation path for when input data is at a second logic level. This segmentation allows independent optimization of each path to reduce jitter while maintaining manageable circuit complexity.
Solution Approach 2:
The system dynamically switches between the first and second modulation paths based on the logic level of the input data. This dynamic switching enables the circuit to adapt to different data states, curbing jitter by ensuring consistent modulation characteristics regardless of the input logic level.
2Reliability
If two modulation paths are provided for OOK modulation to curb jitter, then jitter is reduced, but power consumption increases
Solution Approach 1:
The modulation function is segmented into two separate paths: a first modulation path for when input data is at a first logic level, and a second modulation path for when input data is at a second logic level. This segmentation allows independent optimization of each path to reduce jitter while maintaining manageable circuit complexity.
Solution Approach 2:
The system dynamically switches between the first and second modulation paths based on the logic level of the input data. This dynamic switching enables the circuit to adapt to different data states, curbing jitter by ensuring consistent modulation characteristics regardless of the input logic level.
3Reliability
If isolation devices are used in the signal transmission system, then signal isolation is achieved, but the area occupied by isolation devices is greater than other circuit blocks
Solution Approach 1:
The patent uses a replica of the modulation path circuitry to generate a compensation signal that mirrors the characteristics of the main modulation signal. This copying approach allows for precise jitter compensation without requiring large isolation devices, thereby reducing the overall circuit area while maintaining signal isolation integrity.
Data Source
AI summary
A modulator includes an oscillator to start an oscillation operation when an input data changes from a first logic to a second logic, and stops the oscillation operation when the input data changes from the second logic to the first logic, a pulse generator to output a predetermined number of pulses of a pulse signal having a predetermined pulse width when the input data changes from the second logic to the first logic, and a signal selector to select an oscillation signal outputted from the oscillator when the input data has the second logic, and selects the pulse signal outputted from the pulse generator when the input data has the first logic.