Low Current RSSI Detector Using Subthreshold Transistor Rectification
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Solution Overview
Problem
Existing RSSI detectors face performance drops at low operating currents, which is a challenge for low power electronic devices aiming for longer battery life, as they struggle to effectively measure received signal strength with reduced power consumption.
Innovation Solution
An RSSI detector using a transistor operating in a non-linear mode to generate second-order components, with a filter to attenuate AC components and a determination unit to assess signal strength based on the amplitude of the filtered DC signal, integrated with low noise amplifiers and passive gain circuitry for adaptive gain adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rectification circuit is used to convert AC signal to DC signal for RSSI detection, then resource consumption is reduced, but performance drops at low operating currents
Solution Approach 1:
The patent changes the operating parameters of the transistor by operating it in subthreshold mode rather than standard saturation mode. This parameter change enables the circuit to achieve effective rectification at much lower current levels (nanometer range) while maintaining detection performance, thus resolving the contradiction between low power consumption and reliable detection.
2Duration of action of moving object
If operating current is reduced to extend battery life, then energy consumption decreases, but detection speed and performance deteriorate
Solution Approach 1:
By operating the transistor in subthreshold mode with specific biasing conditions (Vgs below threshold voltage), the patent achieves fast detection response even at nanometer current levels. This parameter change allows the device to maintain detection speed while operating at ultra-low current, thereby extending battery life without sacrificing performance.
3Measurement precision
If gain is increased to improve wanted signal reception, then signal strength improves, but unwanted signals overload the receiver
Solution Approach 1:
The patent replaces traditional aggressive filtering mechanisms with a gentler approach using subthreshold transistor rectification. This substitution allows for better preservation of signal integrity while still achieving effective separation of wanted signals from blockers, reducing signal overload without compromising reception quality.
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
This configuration enhances sensitivity and speed of RSSI detection at low operating currents, allowing for effective signal strength determination and adaptive gain management, thereby improving performance in low power devices.
Implementation Method 1
a transistor configured to operate in a non-linear mode to generate second order components of the received signal comprising a DC component
Implementation Method 2
a filter configured to attenuate the AC component of the generated signal to form a filtered signal
Data Source
AI summary
An RSSI detector for determining a received signal strength of a received signal, including a transistor configured to operate in a non-linear mode to generate second order components of the received signal comprising a DC component and an AC component; a filter configured to attenuate the AC component of the generated signal to form a filtered signal; and a determination unit configured to determine the received signal strength of the received signal based on an amplitude of the filtered signal.