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:
Nov. 14, 2000
Filed:
Jun. 03, 1997
Joseph B Mazzochette, Cherry Hill, NJ (US);
Robert Blacka, Pennsauken, NJ (US);
David Markman, Dresher, PA (US);
EMC Technology LLC, Cherry Hill, NJ (US);
Abstract
A circuit for determining power changes in an RF circuit includes first and second temperature sensitive resistors connected in parallel with an RF input terminal so as to have a common junction therewith. The first resistor has a positive temperature coefficient of resistance and the second resistor has a negative temperature coefficient of resistance. A DC input terminal is connected to one of the temperature sensitive resistors and an output terminal is connected to the common junction of the two temperature sensitive resistors. Third and fourth temperature sensitive resistors have a common junction. The third resistor has a positive temperature coefficient of resistance and the fourth resistor has a negative temperature coefficient of resistance. The DC input terminal is also connected to one of the third and fourth temperature sensitive resistors, and an output terminal is connected to the common junction of the third and fourth temperature sensitive resistors. To improve the linearity of the circuit at high powers, each of the individual temperature sensitive resistors can be replaced with a pair of temperature sensitive resistors, one having a positive temperature coefficient of resistance and the other having a negative temperature coefficient of resistance. In such circuit four output terminals are provided with each output terminal being connected to the junction between the temperature sensitive resistors of each pair.