Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2008-01-29
2008-01-29
Maung, Nay (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S042000, C455S043000, C455S102000, C455S110000, C455S112000
Reexamination Certificate
active
07324798
ABSTRACT:
Disclosed herein is a 2N-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 2N-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 FTX/2N. The poly phase signal generation unit generates a poly phase signal with 2N+1phases. The frequency modulation unit mixes the I and Q components with the poly phase signal with 2N+1phases to generate an output signal with a frequency of FTX. 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.
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Park Yong Kuk
Seo Hae-Moon
Won Kwang-Ho
Yoo June-Jae
Yoon Myung-Hyun
Alam Fayyaz
Korea Electronics Technology Institute
Maung Nay
Sughrue & Mion, PLLC
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