haochidedouyacai
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the paper says: “Figure 3 shows the -3 dB bandwidth characteristic against gain variation of the VGA. The proposed VGA extends its bandwidth by introducing negative capacitance. Also, it can be recognized that the bandwidth remains almost constant in spite of gain variation as illustrated in figure 3. Figure 4 shows the frequency characteristic when the gain is set to 20 dB. The proposed VGA is implemented by two stages of second-order LPF and one stage of first-order LPF. Due to these LPFs, the proposed VGA shows a more drastic cut-off frequency slope than without negative capacitance technique”
i wonder why the VGA has the function of LPF
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