有源滤波器

CQUPT幸运 · 发表于 2022-5-10 14:17:50

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仿真有源滤波器工艺角时发现截至频率变化很大，最大误差50%，有没有什么办法解决呢，或者怎样去进行频率补偿，用的是TSMC65nm工艺，当电阻电容都是ff类型时，误差50%

LoktikVJ · 发表于 2022-5-10 15:08:37

use mos as cap and add RC-calibration

CQUPT幸运 · 发表于 2022-5-10 17:17:40

LoktikVJ 发表于 2022-5-10 15:08
use mos as cap and add RC-calibration

how to add RC-calibration

LoktikVJ · 发表于 2022-5-10 18:27:35

CQUPT幸运 · 发表于 2022-5-10 18:32:56

LoktikVJ 发表于 2022-5-10 18:27

can you share more information,thanks vrey much

LoktikVJ · 发表于 2022-5-10 19:00:15

if something is not clear in picture, I can explain, I used this idea many many times and it worked great for filters. you just need to charge cap by reference current for a few cycles of ref clock and then compare Vcap to voltage drop across res Vres. when Vcap gets higher Vres it means that Tref=Cap*Res, and res mism is compensated by trim capacitance.

LoktikVJ · 发表于 2022-5-10 19:02:13

in not, just increase trim cap and try again

CQUPT幸运 · 发表于 2022-5-11 11:12:12

LoktikVJ 发表于 2022-5-10 19:00
if something is not clear in picture, I can explain, I used this idea many many times and it worked ...

如何控制电容是充电还是放电呢，图中mos管旁边的反相器作用是什么？谢谢！

LoktikVJ · 发表于 2022-5-11 15:23:19

added small update, check timig dig with phases, signal mode controls charge time, then switch current for Vres generation. in the end of cycle disharge cap.

CQUPT幸运 · 发表于 2022-5-11 16:18:31

LoktikVJ 发表于 2022-5-11 15:23
added small update, check timig dig with phases, signal mode controls charge time, then switch curre ...

can you share this paper?

[求助] 有源滤波器

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