Mixer LO Level Feedback for PVT-Stable Frequency Conversion
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Solution Overview
Problem
In wireless communication systems, particularly in high-frequency bands like 5G, the abrupt changes in local oscillator (LO) signal levels due to process, voltage, and temperature variations lead to significant errors in signal conversion, which existing technologies struggle to accurately adjust.
Innovation Solution
An electronic device with a mixer, an oscillation unit, and a signal level control unit is implemented, where the signal level control unit extracts the LO signal, detects changes, and generates a control signal to adjust the signal level, ensuring precise conversion by connecting between the oscillation unit and the mixer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing technologies adjust signal level only based on DC through mirroring circuit, then the structure is simple, but the adjustment precision for abruptly changing signal level is insufficient
Solution Approach 1:
The patent introduces a feedback mechanism where the signal level is continuously monitored and the control signal is adjusted based on the detected level. The controller receives feedback about the actual signal level and modifies the control signal accordingly to achieve precise adjustment, resolving the contradiction by implementing closed-loop control that improves precision without excessive complexity
Solution Approach 2:
The patent transitions from static DC-based adjustment to dynamic adjustment that responds to abrupt changes in signal level. The system continuously adapts the control signal based on real-time signal conditions, enabling precise control of abruptly changing levels while maintaining reasonable circuit complexity through adaptive rather than overly complex static design
2Adaptability or versatility
If LO signal level changes abruptly due to process, voltage, and temperature variations, then the system operates under varying environmental conditions, but significant errors occur in signal conversion
Solution Approach 1:
The feedback mechanism continuously monitors the LO signal level and adjusts the control signal to compensate for variations caused by process, voltage, and temperature changes. This closed-loop control maintains signal conversion accuracy despite environmental variations, resolving the contradiction between adaptability and reliability
Solution Approach 2:
The patent adjusts the control signal parameters dynamically in response to environmental variations. By changing the control signal characteristics based on detected LO signal level changes, the system compensates for PVT variations and maintains reliable signal conversion across different environmental conditions
Data Source
AI summary
A method and apparatus capable of adjusting a signal level in a wireless communication system are provided. An electronic device includes an oscillator configured to output a local oscillator (LO) signal, a mixer configured to convert a frequency band of a first signal based on the LO signal and output a third signal, and a feedback circuit configured to output a feedback signal for adjusting a magnitude of the LO signal, wherein the mixer is further configured to adjust a magnitude of LO signal based on the feedback signal.