Chopped RF Power Sensor for Wide-Range Pulse Measurement
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Solution Overview
Problem
Commercially available RF power sensors have limited sensitivity, pulse settling speed, dynamic range, and accuracy, making them inadequate for monitoring high-frequency RF signals and are often large in size, limiting their use to applications below 25 GHz or laboratory conditions.
Innovation Solution
An RF power detector is designed with a pulsed current regulator that chops the RF signal, using a Schottky diode to maximize sensitivity, and combines logarithmic and linear converters to achieve a wide dynamic range, allowing for accurate measurement of short pulses of high-frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If commercially available RF power sensors are used, then they provide basic measurement capability, but they have limited sensitivity, pulse settling speed, dynamic range, and accuracy
Solution Approach 1:
The patent changes the operating parameters of the Schottky diode by applying a forward bias current, transforming it from a passive component to an active detector element. This parameter change enables the diode to operate in its square law region for accurate power detection across a wide frequency range, resolving the contradiction between measurement accuracy and frequency adaptability
Solution Approach 2:
The patent segments the detection process into distinct functional blocks: RF amplifier for signal conditioning, Schottky diode for power detection, logarithmic converter for dynamic range compression, and linear converter for output. This segmentation allows each component to be optimized for its specific function, achieving high accuracy across wide frequency and dynamic range conditions
2Volume of moving object
If small-sized RF power sensors are used, then they reduce device size, but they have limited operating frequencies or environmental sensitivities that limit their use to applications with operating frequencies of 25 GHz or less
Solution Approach 1:
The patent uses parameter changes in the Schottky diode biasing and the RF amplifier design to enable operation at frequencies above 25 GHz while maintaining a compact form factor. The forward bias current parameter transformation allows the small diode to function as an efficient power detector across extended frequency and environmental ranges
Solution Approach 2:
The patent creates a universal detector design that can operate across multiple frequency bands and environmental conditions by using the Schottky diode in its square law region with forward bias. This multi-functional approach allows the same small device to serve various applications from 25 GHz to higher frequencies without requiring environmental control
3Measurement precision
If the diode is forward biased to maximize sensitivity, then weak signal detection is improved, but the dynamic range must be managed through multiple converters
Solution Approach 1:
The patent segments the dynamic range handling into two distinct conversion paths: a logarithmic converter for weak signals that maximizes sensitivity, and a linear converter for strong signals that maintains accuracy. This segmentation resolves the contradiction by allowing the diode to be forward-biased for weak signal detection while managing overall dynamic range through structured complexity
Solution Approach 2:
The patent implements dynamic switching between logarithmic and linear conversion modes based on signal strength. The system automatically adapts its conversion characteristic to match the input signal level, maintaining optimal sensitivity for weak signals while preserving dynamic range capability across all signal levels
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 provides a sensitive and accurate RF power detector capable of measuring high-frequency signals across a wide dynamic range, improving sensitivity and accuracy while reducing size, enabling effective monitoring in various environments.
Implementation Method 1
The diode is forward biased to maximize its weak signal sensitivity. To maximize the dynamic range of the detector the diode is operated in the square law region for weak RF signals
Data Source
AI summary
An RF power detector having a wide dynamic range may comprise a chopping amplifier and is configured to detect pulsed high frequency RF signals. The chopping amplifier controlled by a bias current regulator amplifies and chops an RF signal by periodically enabling and disabling the amplifier according to a system clock. The chopped high frequency RF signal feeds a Schottky diode biased to operate in the square law region for weak signals. The Schottky diode voltage is tapped and high pass filtered. The voltage drives a logarithmic and linear converter. The converter outputs are summed to produce an output voltage that is a repeatable and stable monotonically increasing function of the RF power.