Title :
A DC-2.5GHz voltage variable attenuator in 0.18-μm CMOS technology
Author :
Abdalla, I.L. ; Allam, A. ; Pokharel, R. ; Jia, H.
Author_Institution :
ECE Dept., Egypt-Japan Univ. of Sci. & Technol., New Borg Al-Arab, Egypt
Abstract :
A CMOS variable voltage attenuator(VVA) with wide bandwidth has been designed and fabricated in a 0.18-μm CMOS process. Four bridge-T stages are cascaded to achieve 12 dB of dynamic range attenuation over a frequency range from DC up to 2.5 GHz. Cascaded bridge-T stages can be programmed to achieve the full scale attenuation and ensure good input and output matching. The design operates with 1.5-dB step size and with a maximum input power of -13 dBm in the entire frequency DC-2.5 GHz range. Worst case S11 is -11.5 dB across the frequency band. The design achieves an input third order intercept point (IIP3) of+31 dBm at maximum-attenuation.
Keywords :
CMOS integrated circuits; UHF integrated circuits; VHF circuits; bridge circuits; waveguide attenuators; CMOS VVA; CMOS technology; IIP3; cascaded bridge-T stages; dynamic range attenuation; four bridge-T stages; frequency 0 GHz to 2.5 GHz; full scale attenuation; input matching; input third order intercept point; output matching; size 0.18 mum; voltage variable attenuator; Attenuation; Attenuators; CMOS integrated circuits; CMOS technology; Insertion loss; Linearity; Resistors; Attenuator; Highly linear attenuator; RF attenuator; VGA; VVA;
Conference_Titel :
Circuits and Systems (APCCAS), 2014 IEEE Asia Pacific Conference on
Conference_Location :
Ishigaki
DOI :
10.1109/APCCAS.2014.7032792
