CHAPTER 4

Gm-C integrators for low-power and low voltage applications. A gaussian polyphase filter for mobile transceivers in 0.35


Prev TOC Next

4.1. Introduction

At low supply voltage, the key problem of analog signal processing functions is dynamic range reduction [1], [2]. This is especially severe in mixed mode systems due to the cross-talk produced by adjacent digital functions. For this reason, a key target is to keep the largest possible voltage swing. Bipolar based transconductors can be widely tuned with negligible variation in the VBE voltage [3]. At low supply voltage, this does not impose restrictions on tunability of the transconductors. On the contrary, in CMOS transconductors, large tunability needed to correct for temperature and process variations gives a significant reduction in voltage swing at low supply voltages [3]. The new technologies are optimized towards digital applications and therefore, modern MOST’s, suffer from second order effects like velocity saturation and mobility reduction. New transconductor concepts which do not rely upon the ideal square law of a MOST, are needed. Another issue is to achieve large tunability without conflicting with the large swing requirement.



Featured Video
Jobs
Mgr Mechanical Engineering 2 for Northrop Grumman at Melbourne, FL
Senior Design Engineer for Kaman at Gilbert, AZ
Sr. Mechanical Engineer for Kateeva at Newark, CA
MECHANICAL ENGINEER for Peter R. Thom and Associates at ORINDA, CA
Upcoming Events
Solidworks World 2017 at Los Angeles CA - Feb 5 - 8, 2017
Design & Manufacturing at Anaheim Convention Center Anaheim CA - Feb 7 - 9, 2017
ACE 2017 Nashville at Nashville TN - Mar 21 - 23, 2017
Innorobo 2017 at Docks de Paris Paris France - May 16 - 18, 2017
MasterCAM



Internet Business Systems © 2017 Internet Business Systems, Inc.
595 Millich Dr., Suite 216, Campbell, CA 95008
+1 (408)-337-6870 — Contact Us, or visit our other sites:
AECCafe - Architectural Design and Engineering EDACafe - Electronic Design Automation GISCafe - Geographical Information Services TechJobsCafe - Technical Jobs and Resumes ShareCG - Share Computer Graphic (CG) Animation, 3D Art and 3D Models
  Privacy Policy Advertise