| Unfolded Frequency Response and Model of a Multi-Tap Direct Sampling Mixer |
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| 作者姓名： | 潘赟 葛宁 董在望 |
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| 作者单位： | Department of Electronic Engineering，Tsinghua University |
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| 基金项目： | Supported by the National Natural Science Foundation of China （No. 90407011） and the National High-Tech Research and Development （863） Program of China （No. 2007AA01Z2b3） |
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| 摘 要： | A transform method was used to model a discrete time multi-tap direct sampling mixer. The method transforms the mixed filtering and down-sampling stages to separate cascade filtering and sampling stages to determine the unfolded frequency response which shows the anti-aliasing ability of the mixer. The trans-formation can also be applied to other mixed signal and multi-rate receiver systems to analyze their unfolded frequency responses. The transformed system architecture was used to calculate the unfolded frequency response of the multi-tap direct sampling mixer and compared with the mixer model without noise in the advanced design system 2005A environment to further evaluate the frequency response. The simulations show that the -3 dB bandwidth is 3.0 MHz and the voltage gain is attenuated by 1.5 dB within a 1-MHz baseband bandwidth.
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| 关 键 词： | 采样混频器 频率响应 转化 积分采样 |
| 收稿时间： | 2 July 2007 |
| 修稿时间： | 26 May 2008. |
Unfolded Frequency Response and Model of a Multi-Tap Direct Sampling Mixer |
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| Yun Pan, ß, Ning Ge, ,Zaiwang Dong, &#x;&#x; .Unfolded Frequency Response and Model of a Multi-Tap Direct Sampling Mixer[J].Tsinghua Science and Technology,2008,13(6):790-795. |
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| Authors: | Yun Pan ß Ning Ge Zaiwang Dong &#x;&#x; |
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| Institution: | bDepartment of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | A transform method was used to model a discrete time multi-tap direct sampling mixer. The method transforms the mixed filtering and down.sampling stages to separate cascade filtering and sampling stages to determine the unfolded frequency response which shows the anti-aliasing ability of the mixer. The transformation can also be applied to other mixed signal and multi-rate receiver systems to analyze their unfolded frequency responses. The transformed system architecture was used to calculate the unfolded frequency response of the multi-tap direct sampling mixer and compared with the mixer model without noise in the ad-vanced design system 2005A environment to further evaluate the frequency response. The simulations show that the -3 dB bandwidth is 3.0 MHz and the voltage gain is attenuated by 1.5 dB within a 1-MHz baseband bandwidth. |
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| Keywords: | multi-tap direct sampling mixer transformation unfolded frequency response decimation integral sampling |
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