RF Power Detection Using Phase-Modulated Signal
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Solution Overview
Problem
Existing communication devices require an oscillator in the demodulator to detect RF signal power, increasing hardware costs.
Innovation Solution
A communication device with a power detection scheme that uses a phase-modulated signal from the transmitter to demodulate RF signals without a dedicated local oscillator, employing a loopback circuit and power detector to detect power in the demodulated signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an oscillator is added to the demodulator to enable correct demodulation of RF signals, then demodulation accuracy is improved, but hardware cost and device complexity increase
Solution Approach 1:
The patent makes the transmitter's phase-modulated signal serve dual functions: both as the signal to be transmitted and as the local oscillator signal for demodulation. This eliminates the need for a separate oscillator in the demodulator, reducing hardware complexity while maintaining demodulation accuracy through the use of the same PM signal for both purposes
2Measurement precision
If an oscillator is added to the demodulator to enable power detection of RF signals, then power detection accuracy is improved, but device complexity and hardware cost increase
Solution Approach 1:
The patent reuses the phase-modulated signal from the transmitter as the local oscillator signal for the demodulator. This allows the demodulator to accurately detect RF signal power without requiring a separate oscillator, thereby maintaining power detection accuracy while reducing hardware complexity and cost
Data Source
AI summary
A communication device with a power detection scheme is disclosed. The communication device includes a transmitter for transmitting an RF signal, a demodulator for demodulating the RF signal by utilizing a phase-modulated (PM) signal provided from the transmitter to generate a demodulated signal, a loopback circuit coupled between the transmitter and the demodulator for transmitting the RF signal and the PM signal from the transmitter to the demodulator when the power detection scheme is enabled, and a power detector for detecting power of the demodulated signal.