Title :
A CMOS Programmable Gain Amplifier with Constant Current-Density Based Transconductance Control
Author :
Kang, So Young ; Ryu, Seung Tak ; Park, Chul Soon
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., KAIST, Daejeon, South Korea
Abstract :
A dB-linear programmable gain amplifier (PGA)utilizing weighted input transistors, is implemented in a 0.18 μm CMOS process. The weighed input transistor units with constant current-density enable insensitive gain-steps while maintaining the load impedance condition. The gain range can cover from -18 dB to +30 dB in 6 dB steps, and the gain error is less than 1 dB. The 3 dB bandwidth (BW) is 60 MHz and the P1dB is -36 dBm at the maximum gain. The chip area is as small as 0.12 mm2 and the total power consumption is only 2.5 mW under 1.8 V supply.
Keywords :
CMOS analogue integrated circuits; amplifiers; current density; electric impedance; CMOS process; CMOS programmable gain amplifier; constant current-density; current density; frequency 60 MHz; gain -18 dB to 30 dB; load impedance; power 2.5 mW; size 0.18 mum; transconductance control; voltage 1.8 V; weighted input transistor; Arrays; CMOS integrated circuits; Digital control; Electronics packaging; Gain; Impedance; Transistors;
Conference_Titel :
Compound Semiconductor Integrated Circuit Symposium (CSICS), 2010 IEEE
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-7437-0
Electronic_ISBN :
1550-8781
DOI :
10.1109/CSICS.2010.5619663
