cmos all-digital frequency tunable pulse radio ultra-wideband transmitter

Abstract

The invention discloses a CMOS all-digital frequency adjustable pulse radio ultra-wideband transmitter, which is composed of an OOK modulation circuit, a delay network, a pulse sequence generation network and an antenna; the OOK modulation circuit processes the input digital signal DATA and the clock signal CLK, Generate a digital signal that meets the requirements of OOK modulation; the delay network adopts the characteristics of the delay of the inverter, and uses the delay interval between the input and output signals as the input signal of the subsequent pulse sequence generation network. During this delay interval period, the generated Single pulse unit with equal time width; each stage of single pulse signal generation circuit in the pulse sequence generation network generates a single pulse signal, and the pulse signals generated by all single pulse signal generation circuits are combined into a pulse sequence, and the entire pulse sequence is used as the output signal The output is sent via the antenna. The pulse frequency of the invention is adjustable and the working bandwidth meets the requirements of the UWB protocol.

Description

technical field [0001] The invention relates to the technical field of pulse radio ultra-wideband, in particular to a CMOS all-digital frequency-adjustable 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 technology mainly uses a series of...

AI Technical Summary

Problems solved by technology

At present, many literatures have been researched on IR-UWB transmitters. These UWBs are mainly realized by the following schemes: Scheme 1 is to first 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 relatively large; the second scheme is to use the delay of the digital circuit to generate several narrow pulses, and then synthesize these narrow pulses into a frequency spectrum to meet The required pulse waveform, this scheme has very strict requirements on the waveform synthesis part, the waveform obtained will be completely distorted if the pulse synthesis time is slightly deviated; in addition, there is another scheme that uses the step recovery characteristics of the avalanche diode to obtain the required The narrow pulse signal of this scheme is not suitable 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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