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:
Oct. 26, 1999
Filed:
May. 13, 1997
Kazuhiko Seki, Tokyo, JP;
Takayoshi Kaneko, Tokyo, JP;
Pacific Communications Research Corporation, Tokyo, JP;
Abstract
An object is to provide a digital quadrature detection circuit wherein, without making the circuit complicated and without lowering performance, the operating frequency can be lowered and power consumption can be reduced. There are provided: a quasi-synchronous detector that takes the exclusive logical sum of a binary-converted intermediate frequency signal and a carrier signal, sampling means that respectively sample the output of the quasi-synchronous detector at M phases (where M is an integer of 1 or more) for each symbol, a bit adder that generates an M-bit parallel signal from the output signals of these, and low-pass filters that extract the low frequency components from this output. Whereas conventionally a 100-times clock pulse was employed in order to obtain an M-bit parallel signal, in this case, a 20-times clock pulse is sufficient, due to the provision of five sampling means.