发明名称 |
Apparatus and methods for digital-to-analog conversion |
摘要 |
An apparatus for converting a digital input signal to an analog signal for transmission. The input signal can include more than one carrier signal. A plurality of delta-sigma modulation loop circuits are connected in an increasing order of operating frequency so as to reduce a word length of the input signal. A tuning circuit adjusts the signal frequency to a transmitting frequency for conversion to analog by a digital-to-analog converter. A first loop circuit is implemented using CMOS gates, and a second loop circuit and the tuning circuit are implemented using indium phosphide gates. The apparatus allows a high-resolution, wide-band RF multiple-carrier signal to be re-quantized to a lower-resolution signal while an acceptable signal-to-noise ratio is maintained. <IMAGE>An apparatus for converting a digital input signal to an analog signal for transmission. The input signal can include more than one carrier signal. A plurality of delta-sigma modulation loop circuits are connected in an increasing order of operating frequency so as to reduce a word length of the input signal. A tuning circuit adjusts the signal frequency to a transmitting frequency for conversion to analog by a digital-to-analog converter. A first loop circuit is implemented using CMOS gates, and a second loop circuit and the tuning circuit are implemented using indium phosphide gates. The apparatus allows a high-resolution, wide-band RF multiple-carrier signal to be re-quantized to a lower-resolution signal while an acceptable signal-to-noise ratio is maintained. <IMAGE>
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申请公布号 |
EP1349284(A2) |
申请公布日期 |
2003.10.01 |
申请号 |
EP20030006234 |
申请日期 |
2003.03.20 |
申请人 |
NORTHROP GRUMMAN CORPORATION |
发明人 |
HINRICHS JEFFREY M.;ROSENKOETTER BRIAN J.;HARNDEN ROBERT R.;WEBER, KENNETH B.;KINTIS MARK (NMI);MARTIN, DONALD R.;SKONES WILLIAM M.;JOHNSON, KAI E. |
分类号 |
H03M3/02;H04L5/02;H04L27/26;(IPC1-7):H03M3/02 |
主分类号 |
H03M3/02 |
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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