Title :
A Low Power Programmable CMOS Circuit for Generating Modulated Pulses for UWB Applications
Author :
Choobkar, Sabrieh ; Nabavi, Abdolreza
Author_Institution :
Tarbiat Modarres Univ., Tehran
Abstract :
This paper describes the use of a digital to analog converter (DAC) based circuit structure for generating modulated Gaussian pulses for low (3.1 to 5 GHz) and high (6 to 10.6 GHz) UWB bands. The voltage references in DAC circuit are obtained by piecewise constant approximation of the pulses. Experimental results with HSPICE using a 0.18 mum CMOS technology with 1.8 V power supply are given for modulated Gaussian pulses with 4 and 8 GHz center frequencies, which resemble 4 and 6 order derivative of the Gaussian pulse. The power consumptions are, respectively, 0.82 mW and 1.26 mW for the main circuit in low and high UWB bands. Since the circuit structure is simple, both the power consumption and the area are relatively much lower than the existing pulse generators. Also, generating sub-nanosecond signals for high UWB band is due to simplicity of the circuit, which otherwise would require a CMOS technology with finer feature size.
Keywords :
CMOS integrated circuits; digital-analogue conversion; pulse generators; ultra wideband communication; CMOS technology; Gaussian pulses; HSPICE; UWB applications; digital-to-analog converter; frequency 4 GHz to 8 GHz; low power CMOS circuit; modulated pulses; piecewise constant approximation; power 0.82 mW; power 1.26 mW; programmable CMOS circuit; pulse generators; subnanosecond signals; voltage 1.8 V; CMOS technology; Digital modulation; Digital-analog conversion; Energy consumption; Modulation coding; Power generation; Pulse circuits; Pulse generation; Pulse modulation; Pulsed power supplies;
Conference_Titel :
Wireless Broadband and Ultra Wideband Communications, 2007. AusWireless 2007. The 2nd International Conference on
Conference_Location :
Sydney, NSW
Print_ISBN :
978-0-7695-2846-5
Electronic_ISBN :
978-0-7695-2846-5
DOI :
10.1109/AUSWIRELESS.2007.6