Nanosecond level narrow pulse signal generating circuit capable of implementing continuous frequency modulation

Abstract

The invention discloses a nanosecond level narrow pulse signal generating circuit capable of implementing continuous frequency modulation. The nanosecond level narrow pulse signal generating circuit comprises an adjustable square wave generating circuit and a digital logic processing circuit. The adjustable square wave generating circuit comprises an NE555 chip, a first adjustable resistor module,a second adjustable resistor module, a first capacitor and a second capacitor, and is used for obtaining a square wave signal. After the narrow pulse signal generating circuit is established, the frequency of the output pulse can be changed by adjusting the resistance of any one of the resistor modules. The digital logic processing circuit comprises a 74HC04 chip, a 74HC86 chip, a 74HC08 chip anda third capacitor, and is used for performing a logic operation on the obtained square wave signal to obtain a nanosecond level narrow pulse. The nanosecond level narrow pulse signal generating circuit disclosed by the invention obtains the nanosecond level narrow pulse, satisfies the requirements that the pulse output frequency is continuously adjustable, and provides a basis for the ultra-wideband (Ultra-Wide Band, UWB) wireless communication technology.

Description

technical field [0001] The invention relates to a narrow pulse signal generating circuit, in particular to a nanosecond-level narrow pulse signal generating circuit capable of continuous frequency modulation. Background technique [0002] In recent years, ultra-wideband (Ultra-Wide Band, UWB) wireless communication technology has become a research hotspot at home and abroad. A very important part of the UWB communication system is how to generate nanosecond or sub-nanosecond pulses, and what kind of pulse shape is used to transmit information is also one of the essential key technologies in UWB technology. [0003] Judging from the current research, the existing UWB narrow pulse implementation methods are equivalent to semiconductor high-speed devices as high-speed switches, and use their charge and discharge characteristics to obtain extremely narrow pulses. Although these circuits can generate sub-nanosecond pulses of tens of volts or even hundreds of volts, they also hav...

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Problems solved by technology

The existing technology cannot flexibly adapt to the requirement of continuously adjustable pulse power output frequency, or the circuit design is complex and costly

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