发明名称 |
Circuit For Reconstructing an Analog Signal From a Digital Signal and Transmission System, Particularly For Wcdma Cellular Telephony, Including Such Circuit |
摘要 |
There is described a circuit for reconstructing an analog signal from a digital signal and wide-band transmission system, particularly for employment in cellular telephony systems, or more in general in mobile communication systems, that adopt the WCDMA standard. The circuit comprises: a digital to analog converter (DAC) suitable for receiving said digital signal and converting it into signal in analog.format;-a low pass-filter (LOW-PASS) connected at the output of said converter for receiving said signal in analog format and providing as output said reconstructed analog signal. Advantageously, the low pass filter (LOW-PASS) is an active filter continuous in time and current coupled to the output of the digital-analog converter (DAC) and the digital-analog converter (DAC) is a converter of the current-steering type functioning at sampling frequency greater than the Nyquist frequency of said analog signal to be reconstructed.
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申请公布号 |
US2007262894(A1) |
申请公布日期 |
2007.11.15 |
申请号 |
US20050569630 |
申请日期 |
2005.05.19 |
申请人 |
STMICROELECTRONICS S.R.L. |
发明人 |
NICOLLINI GERMANO;CONFALONIERI PIERANGELO;MARTIGNONE RICCARDO |
分类号 |
H03M1/66;H03M1/74;H04B1/707;H04M1/78 |
主分类号 |
H03M1/66 |
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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