Title :
Enhanced Grounded Capacitor Multiplier and Its Floating Implementation for Analog Filters
Author :
Padilla-Cantoya, Ivan ; Furth, Paul M.
Author_Institution :
Inst. Tecnol. y de Estudios Super. de Occidente, Tlaquepaque, Mexico
Abstract :
A current-mode capacitor multiplier using a differential amplifier with exponential current scaling is presented. The proposed circuit consists of a reduced implementation of a multiplier based on differential amplifiers with decreased need for parameter matching compared with a conventional structure, thus reducing the power consumption and silicon area. It includes an exponential current scaling scheme to provide a large multiplication factor. Additionally, the differential input stage offers the capability to implement a floating realization for bidirectional applications. The circuit operates with a minimum supply of a gate-source voltage and two saturation voltages of a transistor, making it suitable for low-voltage applications. Experimental results from a fabricated prototype in 0.5-μm technology show the operation of the grounded and floating realizations, as well as their performance when implemented in a second-order low-pass analog filter.
Keywords :
differential amplifiers; elemental semiconductors; low-pass filters; power consumption; silicon; transistors; Si; analog filters; current-mode capacitor multiplier; differential amplifier; enhanced grounded capacitor multiplier; gate-source voltage; parameter matching; power consumption; saturation voltages; second-order low-pass analog filter; size 0.5 mum; transistor; Capacitance; Capacitors; Power demand; Resistance; Silicon; Transconductance; Transistors; Analog Integrated Circuits; Analog integrated circuits; capacitor multiplier; low-voltage analog circuits;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2015.2435751
