Title :
A broadband Variable Gain Amplifier for the Square Kilometer Array
Author :
Ge Wu ; Belostotski, Leonid ; Haslett, J.W.
Author_Institution :
Electr. & Comput. Eng., Univ. of Calgary, Calgary, AB, Canada
Abstract :
In this paper, an inductorless broadband linear-in-dB Variable-Gain Amplifier (VGA) circuit for use in the Square Kilometer Array (SKA) is presented. A two-transistor topology, which realizes a linear-in-dB function, is used to design a differential VGA. The VGA is both input and output power matched to 100Ω differential sources and loads. The design is fabricated in ST 65nm CMOS technology with a 1V power supply. Measurement results show that the VGA has a 25dB variable gain range, input P1dB of -25dBm to -32dBm with control voltage ranging from 0.5V to 1.0V, and is designed to work in a frequency range from 0.7GHz to 1.4GHz, which is the frequency range of the mid-band SKA receiver. The total power consumption of the VGA is 1mW with another 6mW consumed by an input-match circuit and 1mW consumed by an output buffer circuit.
Keywords :
CMOS integrated circuits; buffer circuits; integrated circuit design; network topology; power consumption; power supplies to apparatus; receivers; transistors; wideband amplifiers; SKA; ST CMOS technology; broadband variable gain amplifier; buffer circuit; differential VGA design; differential sources; frequency 0.7 GHz to 1.4 GHz; inductorless broadband linear- in-dB VGA circuit; inductorless broadband linear- in-dB variable-gain amplifier circuit; input-match circuit; mid-band SKA receiver; power 6 mW; power matching; power supply; size 65 nm; square kilometer array; transistor topology; variable gain range; voltage 0.5 V to 1 V; voltage control; Bandwidth; CMOS integrated circuits; Frequency measurement; Gain; Impedance matching; Receivers; Resistance;
Conference_Titel :
Circuits and Systems (ISCAS), 2013 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-5760-9
DOI :
10.1109/ISCAS.2013.6572329
