H-Bridge UWB Pulse Generation for Variable Amplitude Waveforms
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Solution Overview
Problem
Current ultra-wideband pulse generators face challenges in achieving high amplitude pulses beyond 5 GHz, require high electrical energy consumption, and are limited by fixed pulse forms and integration rates, making them unsuitable for low-cost, compact, and adaptable systems in wireless communications.
Innovation Solution
A method and apparatus for generating ultra-wideband waveforms using an H-bridge circuit with adjustable elementary pulse trains and amplitude signals, allowing for variable pulse shapes and amplitudes, enabling operation across wide frequency ranges with low power consumption and adaptability to different applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive circuits and transformers are used to generate UWB pulses, then pulse generation is achieved, but integration rate is limited due to presence of inductors
Solution Approach 1:
The patent replaces passive inductive circuits with an active H-bridge circuit comprising transistors (M1, M2, M3, M4) that can be implemented in standard CMOS technology. This substitution eliminates the need for inductors and transformers, enabling full integration while maintaining pulse generation capability through controlled switching of the H-bridge configuration.
Solution Approach 2:
The patent changes the operational parameters of the H-bridge circuit by controlling the switching timing and configuration of transistors M1-M4 to generate variable pulse shapes and amplitudes. By adjusting the switching parameters, the circuit can adapt to different frequency bands (500 MHz to several GHz) and pulse requirements, achieving both high integration and parameter flexibility.
2Adaptability or versatility
If Step Recovery Diodes are used for pulse generation, then pulse generation is achieved, but adaptability in frequency and amplitude is limited and CMOS compatibility is lost
Solution Approach 1:
The patent substitutes Step Recovery Diodes with an H-bridge circuit using standard CMOS transistors (M1, M2, M3, M4). This replacement maintains pulse generation functionality while enabling full CMOS compatibility and providing superior adaptability through digital control of the switching时序 and configuration, allowing frequency and amplitude adjustment without requiring specialized components.
Solution Approach 2:
The H-bridge circuit serves multiple functions: it generates pulses, adjusts amplitude through transistor switching ratios, varies frequency by controlling switch timing, and compensates for PVT variations. This multi-functionality in a single CMOS-compatible circuit structure provides both the adaptability and manufacturability required for modern UWB applications.
3Device complexity
If fixed pulse forms are generated using passive circuits, then simple circuit implementation is achieved, but adaptability to different applications is lost
Solution Approach 1:
The patent introduces dynamic control to the H-bridge circuit by enabling real-time adjustment of transistor switching timing and configuration. This allows the circuit to dynamically change pulse shapes, amplitudes, and frequencies according to different application requirements, transforming a static circuit into an adaptive system that maintains simplicity while achieving versatility.
Solution Approach 2:
The circuit achieves adaptability by changing operational parameters (switching timing, transistor configuration, duty cycle) rather than requiring different circuit topologies. This parameter-based control allows a single H-bridge structure to generate various pulse forms suitable for different UWB applications, maintaining circuit simplicity while providing full adaptability.
4Adaptability or versatility
If local oscillator and mixer are used for variable pulse generation, then frequency and amplitude variability is achieved, but power consumption increases and amplitude is limited
Solution Approach 1:
The patent replaces the power-intensive local oscillator and mixer architecture with a direct H-bridge switching circuit that generates variable pulses through controlled transistor switching. This substitution eliminates the need for frequency synthesis and mixing operations, dramatically reducing power consumption while maintaining the ability to generate variable frequency and amplitude pulses through digital control of the H-bridge switches.
5Ease of manufacture
If digital pulse generators are used, then integration is improved, but frequency and amplitude are limited by circuit speed
Solution Approach 1:
The H-bridge circuit achieves high-frequency operation by optimizing the switching parameters and transistor sizing (M1-M4) to minimize switching delays. The circuit can operate in frequency bands from 500 MHz to several GHz with repeatability of several hundred MHz, overcoming the speed limitations of fully digital generators while maintaining full integration in standard CMOS technology.
Data Source
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AI summary
The invention relates to a method of generating UWB waveforms each comprising a sequence of elementary pulses, the method comprising steps consisting in: generating at least two pulse signals (E1, E2) each comprising a train of elementary pulses (e1, e2,...) substantially of the same amplitude and of duration corresponding to a setpoint duration, the elementary pulses appearing alternately in the two pulse trains, for each pulse signal, generating an amplitude signal (V1, V2) indicating for each elementary pulse and upon its appearance in the pulse signal an amplitude setpoint (Va1, Va2,...) of the elementary pulse, combining the pulse signals and the amplitude signals to obtain a waveform (s) successively comprising each of the amplified elementary pulses, and alternately positive and negative, the elementary pulses being amplified in accordance with the amplitude setpoint of the elementary pulse, provided by one of the amplitude signals.