100-MHz monolithic low-pass filters with transmission zeros using NIC integrators

Author

Takagi, Shigetaka ; Nitta, Hajime ; Koyama, Jorge ; Furihata, Makoto ; Fujii, Nobuo ; Nagata, Minoru ; Yanagisawa, Takeshi

Author_Institution

Tokyo Inst. of Technol., Japan

Volume

26

Issue

4

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

669

Lastpage

671

Abstract

A monolithic method of implementing VHF filters with transmission zeros is presented. The transmission zeros are obtained using a modified leapfrog simulation method realized without floating capacitors that does not require summing circuits inside the feedback loops. The integrators used are balanced negative impedance converter (NIC) integrators with grounded capacitors, which do not require p-n-p transistors and are suited for low-voltage applications. A low-pass filter with a cutoff frequency of 100 MHz and with a transmission zero at 166 MHz designed and built in an integrated circuit form showed good results, confirming the feasibility of the method

Keywords

active filters; bipolar integrated circuits; integrating circuits; linear integrated circuits; low-pass filters; negative impedance convertors; poles and zeros; radiofrequency filters; 100 MHz; NIC integrators; VHF filters; balanced negative impedance converter; cutoff frequency; grounded capacitors; integrated circuit form; low-voltage applications; modified leapfrog simulation method; monolithic low-pass filters; transmission zeros; Active filters; Band pass filters; Capacitors; Filtering theory; Gyrators; Impedance; Low pass filters; Matched filters; Power supplies; Resistors;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.75072

Filename

75072