A 1.8V high dynamic range CMOS Gm-c filter for portable video systems

Author

Mehrmanesh, S. ; Aslanzadeh, H.A. ; Vahidfar, M.B. ; Atarodi, M.

Author_Institution

Sharif Univ. of Technol., Tehran, Iran

fYear

2002

fDate

11-13 Dec. 2002

Firstpage

38

Lastpage

41

Abstract

A 4th order, 5 MHz, lowpass Butterworth Gm-c filter has been combined with a low noise low-voltage amplifier to form a lowpass filter for video applications. In this filter an improved transconductor and a powerful method is used to adjust the transconductance gain for tuning application. A continuous variable gain current-to-current converter is used to tune the transconductor value. The THD of the filter is -77 dB for 1 V_ppd input signal. Input referred noise is 40 nV/√Hz in the worst case. All the circuits are designed based on a 0.25 μm CMOS process technology with a single 1.8 V supply.

Keywords

amplifiers; convertors; low-pass filters; low-power electronics; video signal processing; 0.25 micron; 1 V; 1.8 V; 5 MHz; 77 dB; CMOS Gm-c filter; current-to-current converter; low noise low-voltage amplifier; lowpass filter; portable video system; transconductance gain; CMOS process; CMOS technology; Circuit noise; Circuit optimization; Dynamic range; Filters; Gain; Low-noise amplifiers; Transconductance; Transconductors;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics, The 14th International Conference on 2002 - ICM

Print_ISBN

0-7803-7573-4

Type

conf

DOI

10.1109/ICM-02.2002.1161491

Filename

1161491