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:
Aug. 19, 1980
Filed:
Nov. 11, 1977
Dieter Hassler, Erlangen, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
Each receiving or transmitting circuit for a respective transducer element includes an individually controllable buffer amplifier which is so operated as to avoid detrimental switching transients. For example, the buffer amplifiers in the receiving circuit may have input switches closed immediately after a transmit pulse and prior to the actual receiving phase. Then output switches of the buffer amplifiers to be activated are closed in the receiving phase, but transients so produced are blocked by the high reverse attenuation of the buffer amplifiers. The input switches may be actuated prior to activation of the transducer elements in receive mode and may serve to simultaneously supply operating voltage to the respective associated buffer amplifiers, the buffer amplifiers all being switched off during transmit mode to block transmit energy from non-active transducers. The transducers of a column of a transducer array may have their outputs summed by means of the buffer amplifiers acting as a voltage controlled current sources.