发明名称 |
A FREQUENCY TRANSLATING SIGMA-DELTA MODULATOR |
摘要 |
An electronic device for converting an analog input signal into a digital output signal includes: a summing device for adding the analog input signal with a feedback analog signal and for generating a summer output signal representative of the sum of the analog input signal and the feedback analog signal; an analog filter coupled to the summing device for filtering undesired signal components from the summer output signal; an analog mixer receiving a signal having a first mixer frequency and coupled to receive the output of the analog filter for frequency translating the filtered summer output signal to a frequency translated summer output signal having one or more frequency components different than the input frequency; a quantizer coupled to the analog mixer for sampling the frequency translated summer output signal at a sampling frequency and for generating the digital output signal; and a feedback branch coupled between the quantizer and summing device for providing the feedback analog signal to the summing device. The feedback branch includes a digital mixer coupled to the quantizer, the digital mixer having a second mixer frequency for frequency translating the digital output signal to a frequency translated digital output signal; and a digital-to-analog converter for converting the frequency translated digital output signal to the feedback analog signal having a frequency equal to the input frequency. The device utilizes frequency translation inside the feedback loop to perform direct conversion of the analog signal to baseband.
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申请公布号 |
CA2277619(A1) |
申请公布日期 |
2000.01.17 |
申请号 |
CA19992277619 |
申请日期 |
1999.07.16 |
申请人 |
THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK |
发明人 |
KHOURY, JOHN;TAO, HAI |
分类号 |
H03M3/02;(IPC1-7):H03M1/46;H03M7/32 |
主分类号 |
H03M3/02 |
代理机构 |
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