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:
Oct. 15, 1996
Filed:
Feb. 23, 1995
Sony Corporation, Tokyo, JP;
Abstract
An active filter circuit used in a receiver circuit of a cellular telephone or the like has a voltage/current conversion circuit, an integrating circuit and a current dividing circuit. The voltage/current conversion circuit converts an input signal voltage to a signal current. The signal current output by the voltage/current conversion circuit is divided between the integrating circuit and ground. The current dividing circuit divides the signal current output by the voltage/current conversion circuit between the integrating circuit and ground. The current dividing circuit extracts low frequency components of the input signal voltage from the integrating circuit, and adjusts the cutoff frequency with respect to the extracted low frequency components to change the dividing ratio of the signal current output from the conversion circuit between the integrating circuit and ground.