Title :
A wide range differential difference amplifier: a basic block for analog signal processing in MOS technology
Author :
Huang, Shu-Chuan ; Ismail, Mohammed ; Zarabadi, Seyed R.
Author_Institution :
Ohio State Univ., Columbus, OH, USA
fDate :
5/1/1993 12:00:00 AM
Abstract :
A CMOS implementation of a wide-input-range differential difference amplifier (DDA) using a V-I converter with large signal handling capability is presented. The DDA is used as a basic building block for continuous-time analog signal processing systems. The basic features of the DDA are verified experimentally using a 2-μm CMOS process MOSIS chip. It is shown that it is generally possible to develop DDA-based analog circuitssth almost infinite input impedances, low component count and without the need to match components/devices external to the DDA. DDA-based circuits such as amplifiers, a MOS grounded resistor, four quadrant multipliers and amplitude modulators are presented. Applications of the DDA in the implementation of frequency selective circuits, e.g., resonator and state-variable second-order filters, are also given. All proposed circuits and design techniques are experimentally verified and demonstrate that DDA-based circuits offer a competitive alternative to op-amp-based circuits
Keywords :
CMOS integrated circuits; analogue processing circuits; differential amplifiers; modulators; 2 micron; CMOS implementation; DDA; MOS technology; MOSIS chip; V-I converter; amplitude modulators; analog signal processing; differential difference amplifier; frequency selective circuits; grounded resistor; input impedances; multipliers; signal handling capability; state-variable second-order filters; Amplitude modulation; CMOS process; Circuits; Differential amplifiers; Frequency; Impedance; Operational amplifiers; Resistors; Resonator filters; Signal processing;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on