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:
Jul. 14, 1981
Filed:
Jan. 17, 1980
Charles M Puckette, Scotia, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
An input circuit is disclosed for variably adapting the dynamic range of an ultrasonic frequency electrical signal to the dynamic range of a signal receiver to which the signal is applied. A band pass filter admits the appropriate band of signal frequencies to the receiver to provide optimum signal-to-noise conditions. A JFET device is shunted across the receiver input and its drain-to-source impedance is varied to control the peak voltage developed by the signal. Control of the impedance of the JFET device may be effected in a pre-programmed manner as a function of time, in response to the amplitude of the signal applied to the receiver input, or in response to both. In either case, the amplitude of the applied signal is constrained to remain substantially within the dynamic range of the receiver.