Temperature-Compensated Amplifier Circuit for Stable Gain
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Solution Overview
Problem
Existing amplification circuits in wireless communication systems face challenges in maintaining constant gain across varying temperatures, as the gain typically decreases with increasing temperature due to the decrease in mutual conductance of MOSFETs.
Innovation Solution
Incorporating a resistance value adjusting circuit that controls the gate voltage of a P-channel MOSFET in parallel with an inductor, which adjusts the resistance value based on temperature, thereby maintaining constant gain by increasing the gate voltage as temperature rises and decreasing it as temperature falls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional amplification circuit is used, then the circuit structure is simple, but the gain decreases with increasing temperature
Solution Approach 1:
The patent applies dynamics by making the resistance value adjustable based on temperature conditions. The variable resistor's resistance value is dynamically changed according to temperature, allowing the amplification circuit to adapt to temperature variations and maintain stable gain performance across different temperature ranges.
Solution Approach 2:
The patent applies parameter changes by modifying the resistance value of the variable resistor in response to temperature changes. This parameter adjustment compensates for the temperature-dependent gain variation, enabling the amplification circuit to maintain constant gain despite temperature fluctuations.
2Reliability
If the resistance value is adjusted to maintain constant gain, then the gain stability improves, but the circuit complexity increases
Solution Approach 1:
The patent applies self-service by enabling the amplification circuit to automatically adjust its own performance characteristics. The variable resistor is controlled based on temperature conditions, allowing the circuit to self-regulate and maintain constant gain without requiring external intervention or complex control systems.
3Reliability
If temperature compensation is implemented, then the gain remains constant across temperatures, but the design complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the resistance value of the variable resistor according to temperature conditions. This parameter modification enables temperature compensation, allowing the amplification circuit to maintain constant gain across different temperature ranges while using a relatively simple implementation approach.
Data Source
AI summary
Provided is an amplification circuit that amplifies an input signal and outputs an amplified signal. The amplification circuit includes: an amplification element that outputs the amplified signal from an output terminal thereof; an inductor having one end to which a power supply voltage is supplied and another end that is connected to the output terminal of the amplification element; a variable resistor that is connected in parallel with the inductor; and a resistance value adjusting circuit that adjusts a resistance value of the variable resistor in accordance with the temperature.