IQ Demodulator RF Sensing Circuit for Unambiguous Power and Phase
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Solution Overview
Problem
Existing radio frequency (RF) transmitter self-sensing circuits require multiple components to measure power and phase, leading to increased area consumption, long testing times, high failure rates, and high costs, while also suffering from phase ambiguity issues.
Innovation Solution
A self-sensing circuit utilizing a single IQ de-modulator to downconvert RF signals into in-phase and quadrature signals, allowing for power and phase calculations in a polar coordinate system without phase ambiguity, thereby reducing component count and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple components (diode, double-sideband mixer, IQ modulator) are used for power and phase measurement, then measurement capability is improved, but device complexity and area consumption increase
Solution Approach 1:
The patent combines power measurement and phase measurement functions into a single IQ demodulator component. The in-phase (I) and quadrature (Q) outputs of the IQ demodulator provide both power and phase information simultaneously, eliminating the need for separate diode and mixer components. This merging approach maintains measurement precision while reducing device complexity.
Solution Approach 2:
The IQ demodulator serves multiple functions: it performs power measurement through its I and Q output magnitudes and phase measurement through the arctangent relationship between I and Q signals. This multi-functional component replaces what previously required multiple specialized components, thereby reducing overall device complexity while maintaining comprehensive measurement capability.
2Measurement precision
If multiple components are used for self-sensing circuit, then measurement functions are complete, but testing and verification time increases
Solution Approach 1:
By merging power and phase measurement into a single IQ demodulator, the patent reduces the number of components that require individual testing and verification. The unified component structure allows for streamlined testing procedures compared to verifying multiple separate components (diode, mixer, modulator), thereby reducing total testing time while maintaining complete measurement functionality.
3Measurement precision
If multiple components are used in self-sensing circuit, then measurement coverage is sufficient, but failure rate increases
Solution Approach 1:
The patent reduces component failure rate by merging multiple components into a single IQ demodulator. With fewer discrete components, there are fewer potential failure points. The unified architecture maintains complete measurement coverage for both power and phase while improving overall circuit reliability through reduced component count.
4Measurement precision
If multiple components are used for power and phase measurement, then measurement accuracy is achieved, but cost increases
Solution Approach 1:
The patent reduces manufacturing cost by consolidating power and phase measurement functions into a single IQ demodulator component. This merging eliminates the need to manufacture and assemble multiple separate components (diode, mixer, modulator), thereby reducing overall manufacturing complexity and cost while maintaining measurement accuracy.
Solution Approach 2:
The IQ demodulator provides multi-functionality by simultaneously enabling both power measurement and phase measurement. This universal component approach reduces the total bill of materials and manufacturing overhead compared to using multiple specialized components, thereby reducing cost while achieving complete measurement accuracy.
5Measurement precision
If double-sideband mixer is used for phase measurement, then phase information is obtained, but phase ambiguity occurs
Solution Approach 1:
The IQ demodulator provides comprehensive phase measurement capability through its I and Q outputs, which together capture the complete phase information without ambiguity. The multi-functional nature of the IQ demodulator allows it to provide both magnitude and phase information in a unified framework, eliminating the phase ambiguity problem that occurs with simpler mixer-based approaches.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate power and phase measurements with a single component, minimizing area consumption and testing times, reducing costs, and eliminating phase ambiguity, while maintaining efficient operation in RF transmitters.
Implementation Method 1
The IQ de-modulator down converts the RF signal to an in-phase (I) signal and a quadrature (Q) signal
Data Source
AI summary
A radio frequency (RF) transmitter for self-sensing power and phase of an RF signal is provided. A local oscillator (LO) is configured to generate a LO signal. A power amplifier is configured to generate the RF signal from the LO signal, wherein the LO and RF signals are periodic signals sharing a waveform and a frequency. An IQ de-modulator is configured to down convert the LO signal and the RF signal into an in-phase (I) signal and a quadrature (Q) signal, wherein direct current (DC) voltages respectively of the I and Q signals define power and phase of the RF signal. A method for self-sensing power and/or phase of an RF signal, and a radar system within which the RF transmitter is arranged, are also provided.