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. 05, 2002
Filed:
May. 22, 2000
Applicant:
Inventor:
Adrianus M. Lafort, Delft, NL;
Assignee:
Microtronic US, Inc., Minnetonka, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 1/00 ;
U.S. Cl.
CPC ...
H03B 1/00 ;
Abstract
A high input impedance circuit for a buffer amplifier of a hearing aid microphone includes a transistor coupled across an input of the buffer amplifier and providing a high impedance transconductance, and a control circuit operatively coupled with the transistor to control the effective value of the input impedance provided thereby.