UWB Pulse Generator Using Delayed Square-Wave Pulse Synthesis
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Solution Overview
Problem
Conventional pulse generators for UWB-IR systems face challenges with high power consumption, LO leakage, and accuracy issues due to the use of delay lines and high-frequency circuits, which complicates the realization of LSI fabrication and results in low accuracy frequency characteristics.
Innovation Solution
A pulse generator configuration that includes a reference clock generation unit, a delay unit for generating differential delayed signals, a square-wave pulse generation unit that outputs pulses with modulated phases based on spread codes, and an amplitude control unit that assigns weights to these pulses to produce high-accuracy impulse signals, reducing power consumption and eliminating LO leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If delay lines are used to generate differential delayed signals, then the pulse generation function is achieved, but manufacturing precision and accuracy deteriorate due to LSI fabrication limitations
Solution Approach 1:
The patent replaces the mechanical delay line approach with an electronic signal processing method. Instead of using physical delay lines that are difficult to fabricate accurately in LSI, the invention uses a reference clock generation unit, delay unit, and square-wave pulse generation unit that can be implemented using standard semiconductor fabrication processes while maintaining high frequency characteristic accuracy through weighted combination of pulses.
2Productivity
If local oscillator and mixers are used to synthesize pulse signals, then pulse generation is achieved, but power consumption increases because these circuits must operate continuously
Solution Approach 1:
The patent implements periodic action by generating square-wave pulses only during the required pulse transmission intervals rather than continuously operating local oscillators and mixers. The reference clock generation unit and square-wave pulse generation unit produce signals periodically according to the pulse generation timing, allowing other circuits to remain idle and reducing overall power consumption while maintaining pulse signal generation capability.
3Productivity
If local oscillator and mixers are used for pulse synthesis, then pulse signal generation is achieved, but LO leakage occurs causing spurious radiation
Solution Approach 1:
The patent extracts and eliminates the local oscillator from the pulse generation system. Instead of using LO and mixers that inherently produce leakage and spurious radiation, the invention directly generates the required pulse signals through the reference clock generation unit, delay unit, and square-wave pulse generation unit, removing the source of LO leakage while maintaining pulse generation functionality through alternative signal synthesis methods.
4Measurement precision
If a large number of high-frequency circuits are used for pulse synthesis, then pulse generation is achieved, but power consumption cannot be suppressed
Solution Approach 1:
The patent removes unnecessary high-frequency circuits from the system. Instead of using multiple high-frequency oscillators and mixers that consume significant power, the invention extracts only the essential functional blocks (reference clock generation unit, delay unit, square-wave pulse generation unit, and amplitude control unit) that can generate accurate frequency characteristics with minimal power consumption by operating only during required intervals.
Data Source
AI summary
A pulse generator for UWB transmission, lower power consumption, and suppression of LO leakage by nonuse of the LO signal. The pulse generator includes a clock generator (CLK) for giving clock of a predetermined period; a delay circuit (DLY) equipped with a function of controlling a delay time and for delaying the clock; a square-wave pulse generation circuit (SWPG) that receives information being spread by a spread code and modulates phases of square wave pulses that have a pulse width corresponding to a differential delay for one stage of the delay circuit; and an amplitude control unit (AMPC) that outputs an impulse sequence having the pulse width of the square wave in a predetermined amplitude and combines the impulses; and outputs pulses that have a predetermined envelope form.