Phase Detector Equalization for Parasitic Load Imbalance
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Solution Overview
Problem
Imbalances in phase detectors within electronic devices can affect the functioning of integrated circuits due to voltage imbalances at output terminals, which are exacerbated by different loadings from local parasitic capacitors or resistors.
Innovation Solution
Incorporating a first equalizer device connected between the output terminals and input terminals of a phase detector, and additional equalizer devices located adjacent to specific components, comprising n-type and p-type transistors in parallel, to equalize voltages during an equalization period, thereby reducing the impact of parasitic loadings and ensuring balanced operation during sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase detector is operated during sensing period, then phase detection function is achieved, but voltage imbalances at output terminals occur due to different loadings from local parasitic capacitors or resistors
Solution Approach 1:
The patent applies preliminary action by performing voltage equalization during an equalization period before the sensing period begins. The equalizer device is activated to equalize voltages at the first and second output terminals during this preliminary equalization period, ensuring that voltage imbalances are corrected before phase detection occurs during the sensing period. This preliminary voltage equalization prevents the voltage imbalance problem from affecting phase detection accuracy.
2Stability of the object's composition
If equalizer device is added to equalize voltages, then voltage imbalances are alleviated, but device complexity increases
Solution Approach 1:
The patent merges the equalizer device with the existing phase detector circuitry by integrating it into the same circuit structure. The equalizer device shares the output terminals (first and second output terminals) with the phase detector, and both operations (equalization and phase detection) are performed within the same device framework. This merging approach adds the necessary equalization function while minimizing the increase in overall device complexity.
Data Source
AI summary
An electronic device including a phase detector is provided. The phase detector includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a first equalizer device. The first transistor has a first input terminal configured to receive a first signal. The second transistor has a second input terminal configured to receive a second signal. The third transistor is electrically connected to the first transistor and has a first output terminal. The fourth transistor is electrically connected to the second transistor and has a second output terminal. The first equalizer device is connected between the first output terminal and the second input terminal.