RF Power Detector Circuit for Low-Complexity Automatic Gain Control
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Solution Overview
Problem
Existing radio frequency receivers face challenges with complex detection circuits and high power consumption in power detectors, limiting their application due to high cost and area occupancy, despite the need for simplified designs that optimize circuit consumption and detection accuracy.
Innovation Solution
A simplified power detector design using a detection circuit and filter circuit to sample differential output signals from a trans-impedance amplifier, coupled with a control logic unit to adjust gain, and an analog-to-digital converter with a level shift circuit to counteract Process Voltage Temperature (PVT) errors, ensuring accurate power detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional power detector with high dynamic range is used, then detection accuracy is improved, but circuit complexity and power consumption increase
Solution Approach 1:
The power detector is divided into two functional segments: a detection circuit for sampling peak values and a filter circuit for energy conversion. This segmentation allows each part to perform a specific function with simple structure, avoiding the need for a complex monolithic detector while maintaining detection accuracy across a wide dynamic range.
Solution Approach 2:
The invention extracts only the essential detection function from complex conventional detectors. By taking out the core capability of detecting output power and converting it to voltage signal through simple peak sampling and energy conversion, the design achieves accurate detection without the unnecessary complexity of traditional high dynamic range detectors.
2Measurement precision
If a conventional power detector with high dynamic range is used, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The detection function is segmented into peak sampling and energy conversion stages, allowing the circuit to operate efficiently by processing signals in discrete steps rather than continuously. This reduces power consumption while maintaining detection accuracy across the dynamic range.
Solution Approach 2:
The invention extracts only the necessary detection functionality, eliminating power-consuming components found in conventional high dynamic range detectors. The simple peak sampling circuit and energy conversion filter consume significantly less power while achieving the required detection accuracy.
3Device complexity
If the detection circuit structure is simplified, then device complexity is reduced, but detection accuracy may deteriorate
Solution Approach 1:
The detection circuit operates within a feedback loop where the filter circuit's output voltage is fed back to control the detection process. This feedback mechanism ensures that even with simple circuit structures, the detection accuracy is maintained by continuously adjusting the detection based on the actual output power level.
Solution Approach 2:
The invention replaces complex mechanical or analog detection mechanisms with a simplified electronic peak sampling approach. By using clock-cycle-synchronized sampling and energy conversion through the filter circuit, the system achieves accurate detection with minimal circuit complexity.
4Adaptability or versatility
If more circuit modules are added to achieve high dynamic range, then detection capability is improved, but area occupancy increases
Solution Approach 1:
The detection circuit and filter circuit are designed to handle a wide dynamic range through their universal functionality. The peak sampling circuit can detect both small and large signal peaks, and the energy conversion filter adapts to different input levels, achieving high dynamic range capability without requiring multiple specialized circuit modules that would increase area occupancy.
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 power detector with a simple structure, low cost, and good reliability, effectively addressing high frequency applications and maintaining accuracy under varying PVT conditions.
Implementation Method 1
a filter circuit, which is connected to the detector circuit, and is configured to convert energy of the differential detection signal obtained at the first output node into an output voltage
Data Source
AI summary
An automatic gain control system and a control method, a power detector and a radio frequency receiver are provided, wherein the power detector includes: a detection circuit, having a first and second input terminals connected to respective first and second differential output terminals of the trans-impedance amplifier, and configured to sample a peak of a differential output signal of the trans-impedance amplifier along with a clock cycle and provide a differential detection signal at a first output node; a filter circuit converts energy of the differential detection signal obtained at the first output node into an output voltage, so that the power detector may be used to detect an output power of the trans-impedance amplifier and adjust, by a control logic unit, a gain or an output power of a low noise amplifier connected to a radio frequency signal.