Simple low-voltage high-speed high-linearity V-I converter with S/H for analog signal processing applications

Author

Huang, Renyuan ; Wey, Chin-Long

Author_Institution

Dept. of Electr. Eng., Michigan State Univ., East Lansing, MI, USA

Volume

43

Issue

1

fYear

1996

fDate

1/1/1996 12:00:00 AM

Firstpage

52

Lastpage

55

Abstract

This paper presents a simple, high-speed, high-linearity V-I converter that has a sample/hold (S/H) function and can be operated under low voltage supply. The converter can be used as the “front end” of current-mode signal processors. The proposed V-I converter circuit is comprised of a current copier and a small resistor that can be realized on chip by using polysilicon. The current copier employed in this implementation has a very small input impedance (≅50 Ω) and is settled within 0.1% in 15 ns under a power supply of 3.3 V. The high-linearity V-I conversion is achieved by using a small resistor (2 kΩ). Simulation results show that, with the transistor parameters of MOSIS 2 μm CMOS technology, the converter achieves a small low-frequency THD (<-65 dB) at a sample rate of 25 MSamples/s, and consumes about 2.5 mW under a power supply of 3.3 V

Keywords

CMOS analogue integrated circuits; analogue processing circuits; convertors; equivalent circuits; sample and hold circuits; switched networks; 2 micron; 2.5 mW; 3.3 V; MOSIS CMOS technology; S/H function; analog signal processing applications; current copier; current-mode signal processor front-end; high-linearity V-I converter; high-speed operation; low-voltage operation; sample/hold function; CMOS process; CMOS technology; Calibration; Circuits; Impedance; Power supplies; Resistors; Signal processing; Switches; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.481475

Filename

481475