Improved design techniques for analog and mixed circuits

Graduation date: 2008Although the digital revolution can realize many of past analog components in the digital forms, our world is surrounded with analog signals such as voice, temperature, etc. The bridge between these two worlds is one of key performance limitations among overall systems and it includes analog filters and data converters.\ud This thesis studies two design techniques with respect to the improvement of the performances of the bridge circuits; one is an implementation of the delta-sigma A/D converter with a new architecture and another is a proposed correlated double-sampling technique for continuous analog filters. A circuit implementation for the new architecture converter is proposed and implemented in AKM 0.18µm CMOS technology. The test results show that the modulator achieves 72dB of SNDR from the 1.8 V supply voltage. A newly proposed correlated double sampling technique compensates the gain error of a high-Q Tow-Thomas filter which originates from the op-amp imperfections. The gain error is reduced to 0.6dB from 2.5dB with the correlated double sampling technique