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. 21, 1992
Filed:
May. 24, 1991
Richard J Conrad, Hamilton, MA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
This invention relates to low transient switching apparatus, and more particularly to switching arrays of low transient switching circuits which are adapted for use to substantially continuously focus transducer channel outputs in an ultrasonic scanning system. A separate switching array is provided for each channel. Each array has a switching circuit with an output for each focusing delay line tap to which a signal on the channel may be applied. Each switching circuit provides a substantially constant D.C. current output regardless of the state of the circuit. Array outputs for each delay line tap are summed, and the summed outputs are applied as the input to the tap. The DC current inputs to all taps are maintained substantially equal, preferably at zero DC current.