IEEE Circuits and Systems, Dallas Chapter:   Seminar
https://ewh.ieee.org/soc/cas/dallas/ 
 
 Title: Tutorial on Sigma-Delta ADC



Presenter: Jinseok Koh, Texas Instruments, Dallas, TX
 

Date:  Monday, April 18, 2005.      6:30pm, refreshments; 7:00pm, program

Location: Dallas Texins Activities Center, Conf Room 4. 

North end of Texas Instruments expressway site, 13900 N Central Expw.; site entrance on north-bound access road, between Midpark Rd. & Spring Valley Rd.)

 
 Abstract: 

In wireless applications power consumption is one of most critical design factors as well as silicon area (cost). To tackle the inherent limitation on the conventional second order Sigma-Delta ADCs, a single-amplifier double-sampling 2nd-order ΔΣ ADC with 5-level quantization is proposed and implemented in 90nm CMOS. Double sampling technique affords to increase sampling frequency twice without increasing the power consumption dramatically. However it creates noise folding due to the inherent capacitor mismatches. To alleviate the capacitor mismatch issues in double sampling techniques, a single capacitor method is introduced. Measurement shows 63dB peak SNDR and 66dB DR in a 1.94MHz bandwidth while consuming 1.2mW from a 1.2V supply.

 
 Biography: 

Jinseok Koh was born in Seoul, Korea, in 1968. He graduated from the Kwangwoon University in Seoul. He received his Ph.D. degree in Electrical Engineering from Texas A&M University, College Station, in 2000. From 1993 to 1996, he was with Samsung Electronics as a Design Engineer working on the high-speed Bi-CMOS SRAM.

During his Ph.D. at Texas A&M University, he was with the Analog Mixed Signal Center. His work was on sensors based on switched capacitor circuits, modeling of non-idealities in data converters and Sigma-Delta ADCs. He developed the LMS-based sigma-delta ADC. He joined Texas Instruments in 2000, where he has been working on transceiver designs for wireless applications. His main focus is on sigma-delta ADCs, high-speed DACs, mixers and AGCs. He is currently Member of Group Technical Staff at Texas Instruments. He has published 11 papers, and holds 2 US patents. He also has 8 pending US patents.

Terry Blake, Publicity Chair, IEEE CAS/Dallas, 972-995-7104