RF Power Measurement Circuit With Temperature-Compensated Output

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Solution Overview

Problem

Existing power measurement circuits for radio frequency power amplifiers face high costs and low measurement precision, particularly in radio frequency transmission systems, necessitating improved accuracy and temperature stability.

Innovation Solution

A power measurement circuit incorporating a power measurement unit, reference current generation unit, and voltage-current conversion unit to calibrate and filter radio frequency signals, generate reference currents with matching temperature coefficients, and perform superposition operations to achieve temperature-independent output voltage measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing power measurement circuits are used for radio frequency power amplifiers, then the system can operate, but measurement precision is low and costs are high

Engineering Contradiction:

Improvepower measurement precisionVSAvoidsystem cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces traditional mechanical or external power measurement instruments with an integrated circuit-based power measurement circuit that uses standard CMOS process. This substitution eliminates the need for expensive external measurement devices while achieving high measurement precision through integrated voltage-current conversion and temperature compensation mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The power measurement circuit is designed to be integrated within the radio frequency power amplifier system, serving multiple functions including power measurement, temperature compensation, and voltage-current conversion. This multi-functionality reduces the need for separate dedicated measurement devices, thereby lowering system costs while maintaining high measurement precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If temperature variations occur in the operating environment, then the system must adapt to different temperatures, but measurement accuracy changes with temperature

Engineering Contradiction:

Improvetemperature adaptabilityVSAvoidmeasurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent employs temperature compensation by dynamically adjusting circuit parameters to counteract temperature effects. The circuit includes temperature compensation circuits that modify operating parameters based on detected temperature changes, ensuring that measurement accuracy remains consistent across different temperature conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The power measurement circuit incorporates feedback mechanisms that continuously monitor temperature variations and adjust measurement parameters accordingly. This feedback loop ensures that measurement accuracy is maintained despite temperature changes by automatically compensating for thermal effects on the measurement process.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If a standard CMOS process is used for manufacturing, then system costs are reduced, but achieving high measurement precision becomes more difficult

Engineering Contradiction:

Improvemanufacturing costVSAvoidpower measurement precision

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent achieves high measurement precision using standard CMOS process by replacing precision external measurement instruments with carefully designed integrated circuit structures. The voltage-current conversion circuits and temperature compensation mechanisms are implemented using standard CMOS devices, eliminating the need for expensive external equipment while maintaining high measurement accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The circuit employs precise parameter control and optimization within the standard CMOS process constraints. By carefully selecting and adjusting circuit parameters such as transistor dimensions, bias currents, and resistance values, the patent achieves high measurement precision using only standard CMOS manufacturing capabilities, without requiring specialized or expensive process variations.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12571827B2Power measurement circuit, chip and communication terminal

Publication Date: 2026.03.10 SHANGHAI VANCHIP ELECTRONICS TECH CO LTD

AI summary

A power measurement circuit, a chip and a communication terminal. The power measurement circuit comprises a power measurement unit (100), a reference current generation unit (200), a voltage-current conversion unit (300) and an operation output unit (400), wherein an output end of the power measurement unit (100) is connected to an input end of the voltage-current conversion unit (300), and an output end of the voltage-current conversion unit (300) and an output end of the reference current generation unit (200) are respectively connected to an input end of the operation output unit (400). By means of the circuit, during the process of a power measurement unit (100) converting, into a direct-current voltage, a received radio frequency signal to be measured, sensitivity adjustment is performed, such that the measurement sensitivity can be effectively adjusted.