UWB Sleep-Wake Circuit Using Dual MOSFET Threshold Control
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Solution Overview
Problem
Existing ultra-wideband (UWB) wireless communication systems face challenges in achieving low power operation and precise wake-up times in deep sleep modes, particularly in UWB transmitters and receivers, due to reliance on high power consumption components and lack of precise clock synchronization during sleep cycles.
Innovation Solution
Implementing a dual transistor structure to double the voltage threshold for digital inputs, using a biasless differential transconductance stage, and employing ultra-low power low dropout regulators to reduce power consumption and improve clock synchronization during sleep modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional single transistor structures are used, then circuit simplicity is maintained, but power consumption is high and voltage threshold is insufficient
Solution Approach 1:
The patent combines a PMOS transistor and an NMOS transistor in parallel configuration to form a dual transistor structure. This merging of complementary transistor types creates a unified circuit element that achieves both low power consumption and doubled voltage threshold, resolving the contradiction between simplicity and performance.
Solution Approach 2:
The patent employs a composite transistor structure combining different transistor types (PMOS and NMOS) with complementary characteristics. This composite approach leverages the advantages of both transistor types to achieve superior power efficiency and voltage threshold properties that neither transistor type could achieve alone.
2Measurement precision
If standard voltage threshold transistors are used, then circuit design is simple, but wake-up time precision in sleep mode is insufficient
Solution Approach 1:
The parallel combination of PMOS and NMOS transistors creates a composite switching element with doubled effective voltage threshold. This merged structure provides precise wake-up timing control in sleep mode while maintaining relatively simple circuit integration.
3Power
If high current consumption components are used, then signal strength is sufficient, but power consumption is high
Solution Approach 1:
The patent uses a composite transistor structure combining PMOS and NMOS devices that operate complementarily. This composite approach achieves sufficient signal strength through coordinated operation of both transistor types while maintaining ultra-low power consumption, particularly in sleep mode.
Data Source
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AI summary
Ultra-Wideband (UWB) wireless technology transmits digital data as modulated coded impulses over a very wide frequency spectrum with very low power over a short distance. To support extended operation, particularly with battery power sources, the inventors have established UWB devices which support wake-up from deep sleep modes when these devices exploit low frequency clock sources for ultra-low power consumption. Further, power consumption may be reduced by exploiting transistors or so-called compounded MOSFET structures whose effective gain and output resistance exceeds any single transistor irrespective of length or by employing biasless low power differential (exponential) transconductance stages within operational transconductance amplifiers in order to provide very high gain low power amplification stages. Further, the inventors have established voltage reference sources that consume very low current, a few nA, and ultra-low power low dropout regulators.