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:
Jan. 15, 1985
Filed:
Mar. 01, 1982
Applicant:
Inventor:
Richard S Hughes, Ridgecrest, CA (US);
Assignee:
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
333 / ; 307540 ; 307564 ;
Abstract
A companding digital to analog converter (DAC) of a digital input and exponential output is utilized to drive a PIN diode having a logarithmic attenuation characteristic. An RF signal applied to the diode is linearly attenuated by the diode and variably controlled by digital means through the DAC.