Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Reexamination Certificate
2006-04-13
2009-12-01
Le, Nhan T (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
C455S319000, C455S339000, C455S259000, C375S324000
Reexamination Certificate
active
07627295
ABSTRACT:
A downconverter and upconverter are provided which can obtain a sufficient image rejection ratio in a low-Intermediate Frequency (IF) scheme while reducing power consumption and can suppress Error Vector Magnitude (EVM)-related degradation in a zero-IF scheme. A complex-coefficient transversal filter rejects one side of a positive or negative frequency, and converts a Radio Frequency (RF) signal to a complex RF signal configured by real and imaginary parts. A local oscillator outputs a real local signal with a set frequency. A half-complex mixer, connected to the complex-coefficient transversal filter and the local oscillator, performs a frequency conversion process by multiplying the complex RF signal output from the complex-coefficient transversal filter and the real local signal output from the local oscillator, and outputs a complex signal of a frequency separated by the set frequency from a frequency of the RF signal.
REFERENCES:
patent: 6856794 (2005-02-01), Tso et al.
patent: 7162218 (2007-01-01), Axness et al.
patent: 2003/0012260 (2003-01-01), Walley et al.
patent: 2004/0002323 (2004-01-01), Zheng
patent: 2006/0003717 (2006-01-01), Sowlati
patent: 2006/0029146 (2006-02-01), Catreux et al.
Baek Won-Jin
Choi Jeong-Ki
Takahiko Kishi
Takahiro Sato
Le Nhan T
Samsung Electronics Co,. Ltd
The Farrell Law Firm, LLP
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