Title :
A 4-bit ultra-wideband beamformer with 4ps true time delay resolution
Author :
Roderick, Jonathan D. ; Krishnaswamy, Harish ; Newton, Kenneth ; Hashemi, Hossein
Author_Institution :
Dept. of Electr. Eng.-Electrophys., Southern California Univ., Los Angeles, CA
Abstract :
This paper documents an ultra-wideband (UWB) fully integrated beamformer which features controllable true time delay and power gain. The UWB beamformer accomplishes 4-bit delay variation with 4 ps resolution, 5 dB gain variation in 1 dB steps, and a -3dB gain bandwidth of 11.2 GHz. Overall operation is achieved by the integration of a three-bit tapped delay trombone-type structure with 4ps variable delay resolution, a one-bit 32ps fixed delay coplanar-type structure, and a variable gain distributed amplifier. The prototype chip fabricated in a 0.18 mum BiCMOS SiGe process occupies 1.6mm2 of silicon area and consumes 125 mW from a 2.5 V supply at the maximum gain setting of 14.2 dB
Keywords :
BiCMOS integrated circuits; beam steering; delay circuits; microwave antenna arrays; silicon compounds; ultra wideband technology; 0.18 micron; 11.2 GHz; 125 mW; 14.2 dB; 2.5 V; 3 dB; 4-bit delay variation; 5 dB; BiCMOS integrated circuits; SiGe; beam steering; coplanar-type structure; delay circuit; microwave antenna array; tapped delay; true time delay resolution; ultra-wideband beamformer; variable delay resolution; Bandwidth; BiCMOS integrated circuits; Delay effects; Distributed amplifiers; Electromagnetic scattering; Gain; Microwave antenna arrays; Narrowband; Phased arrays; Ultra wideband technology;
Conference_Titel :
Custom Integrated Circuits Conference, 2005. Proceedings of the IEEE 2005
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-9023-7
DOI :
10.1109/CICC.2005.1568791
