Title :
A 25 Msps 8-bit/10 Msps 10-bit CMOS data acquisition IC for digital storage oscilloscopes
Author :
Kusayanagi, Naoya ; Choi, Toru ; Hiwatashi, Masaya ; Segami, Masahiro ; Akasaka, Yasukazu ; Wakabayashi, Tadashi
Author_Institution :
Lab. of Electron., Yokogawa Electr. Corp., Tokyo, Japan
Abstract :
A data acquisition IC has been developed for digital storage oscilloscopes (DSOs). The entire DSO front-end except an input attenuator was integrated using 1 μm double-poly, double-metal (DPDM) CMOS process technology. In the analog-to-digital conversion, a time-interleaved successive approximation architecture effectively enables both 25 Msps 8-bit and 10 Msps 10-bit operations. The input signal conditioner consists of a variable gain amplifier (VGA) and a 2nd-order programmable low-pass filter (LPF) using the folded-cascode structures with current feedback circuits. Their overall gain is externally controllable from 12 dB to 38 dB, and their bandwidth is programmable at 500 kHz, 5 MHz, and 25 MHz. The chip consumes 220 mW at the 25 Msps operating condition and less than 8 mW in the power-down mode from a single 5 V supply
Keywords :
CMOS integrated circuits; analogue-digital conversion; data acquisition; digital storage oscilloscopes; gain control; mixed analogue-digital integrated circuits; 1 micron; 10 bit; 12 to 38 dB; 220 mW; 2nd-order programmable low-pass filter; 5 V; 500 kHz to 25 MHz; 8 bit; 8 mW; CMOS data acquisition IC; DSO front-end; analog-to-digital conversion; current feedback circuits; digital storage oscilloscopes; double-poly double-metal CMOS process; folded-cascode structures; gain control; input signal conditioner; programmable bandwidth; time-interleaved successive approximation architecture; variable gain amplifier; Analog-digital conversion; Attenuators; CMOS digital integrated circuits; CMOS integrated circuits; CMOS process; CMOS technology; Data acquisition; Digital integrated circuits; Integrated circuit technology; Oscilloscopes;
Conference_Titel :
Custom Integrated Circuits Conference, 1997., Proceedings of the IEEE 1997
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-3669-0
DOI :
10.1109/CICC.1997.606634
