A Very High-Frequency Transistor-Only Linear Tunable Companding Current-Mode Integrator

Authors: Worapishet A.¹; Mahattanakul J.²; Toumazou C.³

Source: Analog Integrated Circuits and Signal Processing, Volume 22, Numbers 2-3, March 2000 , pp. 187-193(7)

Publisher: Springer

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Abstract:

A low-distortion tunable transistor-only integrator suitable for applications in the frequency range approaching the f_{T} of transistors is presented. The circuit is a modified version of the recently introduced companding current-mode integrator utilizing the non-linear base-emitter diffusion capacitance of the BJT. A first-order approximation of the circuit characteristics is explained, followed by a brief discussion on the departure from ideal characteristics due to transistor nonidealities. Experimental and simulated results of practical integrators are given to verify the feasibility of the proposed modified circuit.

Language: English

Document Type: Regular paper

Affiliations: 1: Department of Telecommunication Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand 2: Department of Electronic Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand 3: Imperial College of Science, Technology and Medicine, London, UK

Publication date: 2000-03-01