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. 06, 2015
Filed:
May. 23, 2012
Shuichi Fukuda, Tokyo, JP;
Shuichi Fukuda, Tokyo, JP;
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Abstract
There is provided a transmitter with a small area and low noise. A direct RF modulation transmitter is constituted by an N-number of input signal delay-attached direct RF converters to which an I digital baseband signal is input, an M-number of input signal delay circuit-attached direct RF converters (DDRCs) to which a Q digital baseband signal is input, a Divide-by-2 divider for generating a differential local signal differing in phase by 90 degrees, an output matching circuit, and a delay control circuit for controlling an input data delay amount for the DDRCs. This transmitter sets delay amounts for the DDRCs using the delay control circuit independently. Particularly when N is set to equal M and the same amount of delay is set for N-number of converters corresponding to the I digital baseband signal and the Q digital baseband signal, noise reduction effect in a predetermined frequency band is heightened.