RF Power Compensation Circuit Using Temperature Feedback Gain Control
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Solution Overview
Problem
The power of RF signals transmitted by a communication system's transmission circuit varies due to temperature fluctuations, leading to insufficient or excessive power levels, affecting the receiving electronic devices.
Innovation Solution
A transmission circuit with a temperature monitoring and calibration mechanism that adjusts gain parameters in the base-band and processing circuit to compensate for temperature variations in the RF amplification circuit, using digital and analog gain compensation circuits to maintain consistent signal power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the RF amplification circuit operates without temperature compensation, then the device complexity is reduced, but the output power stability deteriorates due to temperature variations
Solution Approach 1:
The patent implements a feedback mechanism where the temperature monitoring circuit continuously detects the temperature of the RF amplification circuit and feeds this information to the calibration circuit. The calibration circuit then adjusts the gain parameter of the base-band circuit accordingly, forming a closed-loop feedback system that automatically compensates for temperature-induced power variations without requiring complex manual intervention.
Solution Approach 2:
The patent replaces potential mechanical temperature compensation methods with electronic/circuit-based solutions. By using temperature monitoring circuits to detect temperature changes and calibration circuits to electronically adjust gain parameters, the system achieves temperature compensation through electronic means rather than mechanical adjustments, maintaining simplicity while ensuring stability.
2Stability of the object's composition
If temperature monitoring and calibration circuits are added, then the output power stability is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the temperature monitoring and calibration functions into the existing transmission circuit architecture. The temperature monitoring circuit leverages existing temperature sensing capabilities within the RF amplification circuit, and the calibration circuit utilizes the existing gain control mechanisms of the base-band circuit. This multi-functional integration allows temperature compensation without adding completely separate, complex subsystems.
Solution Approach 2:
The system implements self-service temperature compensation where the transmission circuit automatically monitors its own temperature and adjusts its own gain parameters without external intervention. The temperature monitoring circuit detects temperature changes in the RF amplification circuit, and the calibration circuit automatically adjusts the base-band gain to compensate, enabling the system to self-regulate and maintain stable output power.
3Stability of the object's composition
If the gain parameter is adjusted to compensate for temperature changes, then the power stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent dynamically changes the gain parameter of the base-band circuit based on temperature conditions rather than relying on fixed, precision-manufactured components. By making the gain parameter adjustable and temperature-dependent, the system compensates for temperature variations through parameter modification rather than requiring precisely manufactured components that maintain constant performance across temperature ranges.
Data Source
AI summary
The present invention discloses a transmission circuit having output power compensation mechanism. A base-band circuit receives and processes a digital input signal to perform conversion and amplification according to at least one gain parameter to generate an analog output signal. A frequency up-converting circuit performs frequency up-conversion on the analog output signal to generate an RF signal. A RF amplification circuit amplifies the RF signal to generate an output RF signal to an antenna. A temperature monitoring circuit monitors temperature of the RF amplification circuit to generate an instant temperature value thereof. A calibration circuit increases at least a part of the gain parameter when the instant temperature value makes a power of the RF amplification circuit decrease and decreases at least a part of the gain parameter when the instant temperature value makes the power increase.