A novel SFG structure for C-T high-pass filters

Author

Nielsen, Ivan Riis

Author_Institution

Inst. of Comput. Sci., Tech. Univ. of Denmark, Lyngby, Denmark

Volume

28

Issue

7

fYear

1993

fDate

7/1/1993 12:00:00 AM

Firstpage

840

Lastpage

844

Abstract

A signal flow graph (SFG) structure for simulating passive high-pass ladder filters, called the incremental integration structure, is proposed. The structure requires the use of integrators with nonintegrating inputs, and an implementation based on the MOSFET-C technique is discussed. The incremental integration structure is compared to the leapfrog and direct SFG simulation structures. Leapfrog high-pass filters are relatively simple and show good noise properties, but they are based on differentiators and thus stability problems exist. The direct SFG simulation method is based on integrators and has good stability properties, but it leads to a relatively high circuit complexity and a high noise level. However, the incremental integration structure inherits the low-noise properties of the leapfrog structure and the good stability of the direct SFG simulation method. A sixth-order elliptic high-pass filter chip with a passband frequency of 3.0 kHz has been manufactured, and measurements support the validity of the approach

Keywords

CMOS integrated circuits; active filters; high-pass filters; ladder networks; linear integrated circuits; stability; 3 kHz; C-T high-pass filters; MOSFET-C technique; SFG simulation method; filter chip; incremental integration structure; ladder filters; low-noise properties; passive filter simulation; signal flow graph; sixth-order elliptic filter; stability properties; Circuit noise; Circuit simulation; Circuit stability; Complexity theory; Flow graphs; Frequency; MOSFET circuits; Noise level; Passband; Passive filters;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.222185

Filename

222185