Design of versatile modulator using CDTAs

Author

Pandey, Narendra ; Sayal, Aseem ; Tripathi, Meenakshi ; Pandey, Rashmi

Author_Institution

Dept. of Electron. & Commun. Eng., Delhi Technol. Univ., New Delhi, India

fYear

2013

fDate

10-11 Oct. 2013

Firstpage

1

Lastpage

6

Abstract

In this paper, a versatile modulator circuit that can be used for amplitude modulation, frequency modulation, delta modulation and sigma delta modulation has been proposed. The circuit has been implemented with the help of CDTA blocks, grounded capacitor and resistors. The circuit basically consists of an integrator, a Schmitt trigger and an inherent clock which is used as a carrier signal thereby obviating the need for an external clock. Due to its compact size, it is suitable for IC realisation. The performance comparison of different modulation modes is made in terms of power dissipation, signal to noise ratio (SNR) and output noise voltage.

Keywords

delta-sigma modulation; differential amplifiers; modulators; operational amplifiers; CDTA blocks; IC realisation; SNR; Schmitt trigger; amplitude modulation; current difference transconductance amplifier; delta modulation; external clock; frequency modulation; grounded capacitor; inherent clock; integrator; output noise voltage; power dissipation; resistors; sigma delta modulation; signal to noise ratio; versatile modulator circuit design; Amplitude modulation; Capacitors; Frequency modulation; Sigma-delta modulation; Signal to noise ratio; Transconductance; Amplitude Modulation; Current difference transconductance amplifier (CDTA); Delta Modulation; Frequency Modulation; Sigma Delta Modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Emerging Trends in Communication, Control, Signal Processing & Computing Applications (C2SPCA), 2013 International Conference on

Conference_Location

Bangalore

Print_ISBN

978-1-4799-1082-3

Type

conf

DOI

10.1109/C2SPCA.2013.6749419

Filename

6749419