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:
Sep. 21, 1993
Filed:
Aug. 15, 1991
Hiroki Tsuda, Tokyo, JP;
Susumu Otani, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A time division PLL is composed of a complex multiplier (1), a phase difference detector (2), a low-pass filter (3), an adder (4) and a digital VCO (5). A D.C. value indicating the recovered carrier component of a receive burst is obtained by a squaring circuit (9) from a baseband signal, which is the output of the complex multiplier (1). The time division PLL operates as a PLL having frequency different lead-in ranges on a time division basis, differing between the period in which no burst has been received yet and the period in which the former part of the carrier recovery section of the receive burst is being received. It operates, from the latter part of the carrier recovery section until the completion of data reception, as a PLL having the frequency pull-in range in which the greatest D.C. value was outputted during the time division operation.