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:
Jun. 26, 1990
Filed:
Apr. 05, 1989
Applicant:
Inventor:
Jouni Nyqvist, Muurla, FI;
Assignee:
Nokia-Mobira OY, Salo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 17 ; 331 25 ;
Abstract
Circuitry for compensating for the temperature drift of a phase detector (1) in a phase-locked loop which comprises a phase detector (1), a loop filter (2) and in the feedback branch a voltage controlled oscillator (3) coupled to the phase detector (1). The phase detector (1) is provided with a differential output (I and II), which is coupled to the input terminals (- and +) of the operational amplifier (4) in the loop filter (2), whereby the common-mode temperature drift of the phase detector (1), appearing in the input poles of the operational amplifier, is substantially eliminated in the output of the amplifier (Uout).