Nanosecond Pulse Generator With Delay-Line Impedance Matching
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Solution Overview
Problem
Existing pulse generating devices are large and cumbersome due to the need for long delay lines, making precise control of pulse duration difficult and requiring additional space for impedance matching components.
Innovation Solution
A compact pulse generating device using a signal source, delay element, and reflection means with a laser diode as a matching element to create pulses in the nanosecond range, allowing for precise adjustment of pulse duration through the delay element's length and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a long delay line is used to generate nanosecond pulses, then the pulse duration can be controlled, but the device size becomes large
Solution Approach 1:
The patent combines the delay function and reflection function into a single integrated structure. The delay line is configured to both delay the signal and reflect it back, eliminating the need for separate reflection means and reducing the overall device length while maintaining the required pulse duration control.
Solution Approach 2:
The patent uses periodic signal inversion at the delay line endpoint to create the pulse effect. By inverting the signal after a predetermined time period and allowing it to cancel the original signal, the system generates precise nanosecond pulses without requiring excessively long delay lines.
2Ease of manufacture
If component tolerances are present in the delay line, then manufacturing is simplified, but pulse duration control precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the delayed signal is reflected back and inverted to cancel the original signal. This feedback loop creates a self-correcting system that compensates for component tolerances, maintaining precise pulse duration control even with standard manufacturing variations.
Solution Approach 2:
The patent changes the signal parameter (phase inversion) at the delay line endpoint to achieve precise pulse control. By inverting the signal after the delay period, the system creates a cancellation effect that precisely defines pulse duration independent of small variations in delay line characteristics.
3Reliability
If impedance matching components are added to the pulse generating device, then signal integrity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the impedance matching function into the existing delay line structure and signal inversion mechanism. By designing the delay line with specific characteristic impedance and using the inversion point as the matching interface, the system achieves signal integrity without adding separate impedance matching components.
Solution Approach 2:
The patent enables the delay line structure to serve multiple functions simultaneously: signal delay, signal reflection, and impedance matching. The inherent properties of the delay line and the inversion mechanism provide impedance matching without requiring external matching components, reducing overall device complexity.
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
Enables the generation of short, precisely adjustable pulses with logic-compatible voltage and current levels, reducing device size and improving manufacturing ease while maintaining compatibility with logic circuits.
Implementation Method 1
a matching element is present, which causes the resistance of the signal source and/or the reflection means to be matched to the characteristic impedance of the delay element
Implementation Method 2
the matching element comprises a laser diode
Implementation Method 3
a delay element which is electrically coupled to the signal source and which delays a signal applied to the delay element by a predetermined time period
Implementation Method 4
a reflection means, which reflects electrical signals passing through the delay element
Data Source
Figure 1~2
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AI summary
The invention relates to a pulse generation device (10) designed to generate electrical pulses with pulse durations in the nanosecond range. The electrical pulses have logic levels or low voltages. The pulse generation device comprises a signal source (36) providing an input signal, a delay element (18) electrically coupled to the signal source, which delays a signal applied to the delay element by a predetermined time period as it passes through the delay element, a reflection element (24) which reflects signals passing through the delay element, and a signal output (26) for outputting the electrical pulses, which is electrically connected to the delay element. An matching element (16, 42) is provided, which adjusts the resistance of the signal source and/or the reflection element to the characteristic impedance of the delay element. The matching element comprises a laser diode (42).