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. 29, 2008
Filed:
Jul. 27, 2004
Hae-moon Seo, Young-In-Si, KR;
Kwang-ho Won, Young-In-Si, KR;
Yong Kuk Park, Seoul, KR;
Myung-hyun Yoon, Seongnam, KR;
June-jae Yoo, Seoul, KR;
Hae-Moon Seo, Young-In-Si, KR;
Kwang-Ho Won, Young-In-Si, KR;
Yong Kuk Park, Seoul, KR;
Myung-Hyun Yoon, Seongnam, KR;
June-Jae Yoo, Seoul, KR;
Korea Electronics Technology Institute, Kyung-Gi-Do, KR;
Abstract
Disclosed herein is a 2-order sub-harmonic frequency modulator and direct conversion transmitter using the same. The direct conversion transmitter includes a digital modulation unit, a D/A conversion unit, a DC correction and low pass filter unit, a local oscillator, a poly phase signal generation unit, a 2-order sub-harmonic I/Q frequency modulation unit, a power amplification unit, and an antenna. The digital modulation unit digitally modulates a base-band signal and then outputs I and Q component signals. The D/A conversion unit converts the I and Q component signals into analog I and Q component signals. The DC correction and low pass filter unit adjusts DC interfaces of the analog I and Q component signals, passes low frequency components of the analog I and Q component signals and generates I and Q components of a base-band signal. The local oscillator generates a sine wave signal with a frequency of F/2. The poly phase signal generation unit generates a poly phase signal with 2phases. The frequency modulation unit mixes the I and Q components with the poly phase signal with 2phases to generate an output signal with a frequency of F. The power amplification unit amplifies the output of the frequency modulation unit to a required level. The antenna radiates the output signal of the power amplification unit.