Differential Power Detector with DC Voltage Generator for RF Bandwidth
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Solution Overview
Problem
Existing RF power detectors using MOSFETs face challenges in achieving accurate power detection due to large process and temperature variations, which affect the reliability of signal detection and increase power consumption, especially in applications requiring wide bandwidth.
Innovation Solution
A power detector design incorporating a differential input unit with a DC voltage generator and a differential output unit that includes complementary MOS transistors for full-wave rectification, along with a negative output signal generator to maintain linearity by compensating voltage differences, ensuring stable operation across varying input signal amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a MOSFET is used as a power detector component to achieve wide bandwidth, then the bandwidth is sufficiently wide to support RF signal detection, but the structure becomes complex (such as RSSI) and power consumption increases
Solution Approach 1:
The power detector is divided into two independent differential circuits: a detection circuit that converts differential voltage to differential current, and a reference circuit that generates reference current based on a predetermined voltage. Each circuit operates independently, simplifying the overall structure while maintaining wide bandwidth capability for RF signal detection.
Solution Approach 2:
A reference circuit is created as a copy of the detection circuit structure, but with fixed voltage input instead of AC signal input. This reference circuit generates a stable reference current that compensates for process and temperature variations, eliminating the need for complex RSSI structures while maintaining detection accuracy.
2Speed
If a MOSFET is used as a power detector component to achieve wide bandwidth, then the bandwidth is sufficiently wide to support RF signal detection, but power consumption increases
Solution Approach 1:
The power detector is divided into two independent differential circuits: a detection circuit that converts differential voltage to differential current, and a reference circuit that generates reference current based on a predetermined voltage. Each circuit operates independently, simplifying the overall structure while maintaining wide bandwidth capability for RF signal detection.
Solution Approach 2:
The invention changes the operating parameters by using differential voltage input and generating differential current output, with a reference circuit that operates at a predetermined fixed voltage. This parameter transformation allows the detector to achieve wide bandwidth while maintaining low power consumption through efficient current-mode operation.
3Productivity
If the output current is generated using MOSFET voltage-current conversion characteristic, then the power detector can operate, but the output current has large variation to process and temperature changes
Solution Approach 1:
The invention implements a feedback mechanism where the reference circuit monitors the detection circuit's operation and provides a compensating reference current. This feedback loop counteracts the effects of process and temperature variations on the MOSFET's voltage-current conversion characteristic, stabilizing the output current and improving measurement precision.
Solution Approach 2:
A reference current acts as an intermediary element between the detection circuit and the output. This reference current, generated from a predetermined voltage in a circuit mirroring the detection circuit's structure, mediates the effects of environmental variations and process tolerances, providing a stable baseline that improves output current stability.
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 proposed design enhances the accuracy and reliability of power detection while maintaining low power consumption, ensuring consistent performance across different input signal levels and temperatures.
Implementation Method 1
a differential output unit including a differential output terminal which full wave rectifies the AC signal input from the differential input unit and outputs a differential signal
Implementation Method 2
a DC voltage generator which generates and outputs a DC voltage
Implementation Method 3
utilizes a voltage-current conversion characteristic of an active area NMOS
Data Source
AI summary
A power detector having a differential input unit and a differential output unit. In one aspect, the invention may be a power detector including a differential input unit including a differential input terminal to which an AC signal is input and a DC voltage generator which generates and outputs a DC voltage; and a differential output unit including a differential output terminal which full wave rectifies the AC signal input from the differential input unit and outputs a differential signal, wherein a negative output terminal of the differential output terminal is connected to the output terminal of the DC voltage generator.