The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 2002
Filed:
Dec. 15, 1999
Giacomino Bollati, Castel San Giovanni, IT;
Roberto Alini, Pleasanton, CA (US);
Daniele Ottini, Pavia, IT;
Melchiorre Bruccoleri, Rho, IT;
STMicroelectronics S.R.L., Agrate Brianza, IT;
Abstract
A low pass filter with programmable equalization includes at least one biquadratic cell and a converter of the input voltage into a current, proportional to the derivative of the input voltage, that is injected on a node of the biquadratic cell to introduce two real and opposed zeros in the transfer function of the filter. The low pass filter includes two structurally similar circuits functionally connected in cascade. Each circuit includes a biquadratic cell and an input stage having two outputs injecting, through a first current output, the current to an input capacitor of the respective biquadratic cell, by a direct coupling in a first of the two circuits and in an inverted manner in the second of the two circuits. A second voltage output is coupled to an input of the respective biquadratic cell.