FET-based RF Power Detector Harmonic Suppression
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Solution Overview
Problem
Current power detectors for high-frequency electromagnetic waves face challenges such as high harmonics, lack of CMOS compatibility, and high power consumption, particularly in antenna-based applications.
Innovation Solution
An apparatus utilizing a first and second field-effect transistor element, along with a capacitive element, configured in a Greinacher circuit to convert high-frequency electromagnetic wave power into a DC electrical voltage signal, effectively avoiding harmonics and optimizing CMOS compatibility and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive pn diode-based or Schottky diode-based power detectors are used, then power detection function is achieved, but high harmonics to base high frequency occur and CMOS compatibility is lacking
Solution Approach 1:
The patent changes the operating parameters by using field-effect transistors biased in specific regions (linear or saturation) with carefully selected W/L ratios to operate as soft switchers, fundamentally altering the detection mechanism from diode-based rectification to transistor-based switching detection, thereby eliminating harmonics while maintaining CMOS compatibility
Solution Approach 2:
The patent substitutes the mechanical/diode-based rectification system with an electronic field-effect transistor switching system, replacing the physical diode junction with electrically controlled transistor channels that can be precisely biased to avoid harmonic generation while maintaining full CMOS process compatibility
2Measurement precision
If active power detectors based on cascade or logarithmic amplifiers are used, then power detection sensitivity is improved, but power consumption becomes particularly high
Solution Approach 1:
The patent employs periodic switching action of field-effect transistors operating as soft switchers, where the transistors are periodically turned on and off in response to the RF signal, converting RF power to DC through controlled periodic charge transfer rather than continuous amplification, thereby achieving sensitivity without continuous high power consumption
Solution Approach 2:
The detector circuit uses the RF signal itself to drive the switching action of the transistors, where the input signal provides the energy needed for switching without requiring separate biasing circuits or amplification stages, enabling the circuit to serve itself and minimizing external power requirements while maintaining detection sensitivity
3Measurement precision
If thermal power detectors are used, then device complexity is reduced, but sensitivity becomes very low
Solution Approach 1:
The patent changes the detection parameter from thermal effect to electrical switching effect by using field-effect transistors in soft-switching mode, where the transistors' channel conductivity is modulated by the RF signal and converted to DC through capacitive coupling, achieving high sensitivity through electrical rather than thermal mechanisms while keeping the circuit relatively simple
Solution Approach 2:
The patent substitutes the thermal detection mechanism with an electrical field-effect mechanism, replacing thermal conversion processes with electrically controlled transistor switching and capacitive energy transfer, thereby achieving superior sensitivity without proportionally increasing device complexity
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 achieves reduced harmonic interference, improved CMOS compatibility, and lower power consumption, enabling efficient conversion of high-frequency electromagnetic wave power into a DC signal.
Implementation Method 1
The first conversion device furthermore comprises at least one first capacitive element, which is electrically coupled to the signal input region and is configured in order to avoid at least one harmonic of the electromagnetic wave
Implementation Method 2
a first conversion device, the first conversion device comprising at least a first field-effect transistor element and a second field-effect transistor element
Data Source
AI summary
According to one embodiment, an apparatus for converting the electrical power of an electromagnetic wave into a DC electrical voltage signal is disclosed, the apparatus comprising a signal input region for receiving the electromagnetic wave, a signal output region for providing the DC electrical voltage signal, and a first conversion device, and the first conversion device comprising at least a first field-effect transistor element and a second field-effect transistor element, which is electrically coupled to the signal output region, the second field-effect transistor element being configured for series coupling to the first field-effect transistor element. According to this embodiment, the apparatus furthermore comprises at least one first capacitive element, which is electrically coupled to the signal input region, the first conversion device being configured in order to avoid at least one harmonic of the electromagnetic wave.