发明名称 |
PROGRAMMABLE IF OUTPUT RECEIVER, AND APPLICATIONS THEREOF |
摘要 |
A tuner system for receiving a plurality of frequency bands includes a low noise amplifier coupled with a band selection filter to select a desired band. The tuner system further includes a complex RF filter to produce a complex RF signal from the selected band. The tuner system includes two double-quadrature converters, the first double-quadrature converter frequency down-converts the complex RF signal to a complex baseband signal. The complex baseband signal passes through a baseband filter that contains two identical lowpass filters for obtaining a baseband in-phase (I) signal and a quadrature (Q) signal. The second double-quadrature converter up-converts the baseband I and Q signals to respective IF I and Q signals that are significantly free of the positive third IF harmonic. The third IF-harmonic free I and Q signals are further processed by a complex bandpass filter. The bandpass filter has a programmable frequency center and a programmable bandwidth. |
申请公布号 |
EP2351360(A4) |
申请公布日期 |
2012.07.18 |
申请号 |
EP20090824142 |
申请日期 |
2009.10.29 |
申请人 |
SYNOPSYS, INC. |
发明人 |
LEME, CARLOS AZEREDO;REIS, RICARDO |
分类号 |
H04N5/46;H03D7/00;H04N5/44 |
主分类号 |
H04N5/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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