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Unfolded frequency response and model of a multi-tap direct sampling mixer

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3 Author(s)
Yun Pan ; Department of Electronic Engineering, Tsinghua University, Beijing 100084, China ; Ning Ge ; Zaiwang Dong

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 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.

Published in:

Tsinghua Science and Technology  (Volume:13 ,  Issue: 6 )