cmos all-digital bpsk modulated pulse radio ultra wideband transmitter

Abstract

The invention discloses a CMOS full-digital BPSK modulation pulse radio ultra-wideband transmitter, which is composed of a BPSK modulation module, a delay generation module, a pulse sequence generation module and an antenna; the BPSK modulation module processes the input digital signal DATA and the clock signal CLK, Generate a digital signal that meets the requirements of BPSK modulation; the delay generation circuit of each stage of the delay generation module uses the characteristics of inverter delay to delay the modulated signal output by the BPSK modulation module to obtain different delay outputs, which are used to control the corresponding The pulse sequence generating circuit of the device generates a pulse unit of equal time width; each stage of the pulse sequence generating circuit of the pulse sequence generating module generates a single pulse signal, and all the pulse signals are combined into a pulse sequence as the output signal output via the antenna. The wireless transmission signal generated by the invention meets the requirements of the frequency spectrum and working frequency band of UWB.

Description

technical field [0001] The invention relates to the field of ultra-wideband technology, in particular to a CMOS all-digital BPSK modulated pulse radio ultra-wideband transmitter. Background technique [0002] Since the U.S. Federal Communications Commission (FCC) promulgated the Ultra-Wideband (UWB) spectrum specification in 2002, and used the 3.1GHz-10.6GHz frequency band as an unlicensed frequency band for civilian UWB equipment, Ultra-Wideband Broadband communication technology has been applied research and attention in fields such as wireless personal area network, wireless sensor network, and biomedicine because of its simple system structure, high transmission rate, and low power consumption. [0003] Current UWB communication systems can be divided into three categories: Direct Sequence Spread Spectrum (DS-SS), Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM), and Impulse Radio (IR). Among them, IR-UWB (pulse radio ultra-wideband) technology mainly uses...

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Problems solved by technology

At present, many literatures have been researched on IR-UWB transmitters. These IR-UWB transmitters are mainly realized by the following schemes: Scheme 1 is to use a digital circuit to delay to obtain a narrow pulse. After the narrow pulse passes through the shaping network, the spectrum is moved. To the required frequency band, this scheme needs to use a large number of capacitors, inductors and resistors, so the chip area and cost are large; the second scheme is to use the delay of the digital circuit to generate several narrow pulses, and then use these narrow pulses Synthesize a pulse waveform whose spectrum meets the requirements. This scheme has very strict requirements on the waveform synthesis part. If the pulse synthesis time deviates slightly, the obtained waveform will be completely distorted. Another scheme is to use the step recovery of the avalanche diode characteristics to obtain the required narrow pulse signal, this scheme is very unsuitable for CMOS chip integration because the process of the avalanche diode device used is not compatible with the standard CMOS process

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