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樓主: 賴永諭
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61#
 樓主| 發表於 2024-6-6 11:12:29 | 只看該作者
Update 文件~9 b9 \% q) n3 h) u9 M7 T7 w0 _
Two stage ring oscillator analysis
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62#
 樓主| 發表於 2024-6-6 11:16:57 | 只看該作者
Two stage ring oscillator analysis文件上傳~~
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63#
 樓主| 發表於 2024-6-7 10:04:08 | 只看該作者
本帖最後由 賴永諭 於 2024-6-7 10:05 AM 編輯 % u/ M! F8 L# t
賴永諭 發表於 2024-6-6 11:16 AM; {% c  c- P% ]. M+ `, b" E  E
Two stage ring oscillator analysis文件上傳~~
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Two stage ring oscillator analysis文件上傳~~
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64#
 樓主| 發表於 2024-8-30 17:19:57 | 只看該作者
slide 1010
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5 W/ N. V. W6 e4 n. Z$ e5 HFor a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF. 9 i$ @: q% s- S4 u
The signal bandwidth is determined by RF and not by the circuit gain.3 Z) W( B2 y; t1 a1 P6 s: ~
The circuit gain is independently set with RS.
" K1 J+ f* m; E+ V  B6 ?+ x2 yThe signal bandwidth remains stable for all gain settings .
( ~. t" i, Y& D3 u- |Even for unity-gain operation, an RF resistor is required.
" [; ~: Y2 W, X2 k. rThe best practice when designing with CFB op-amps is to use the RF values given in the datasheet and to adjust the desired gain level through RS.
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65#
 樓主| 發表於 2024-9-9 10:21:54 | 只看該作者
slide 1020
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(1) The closed-loop gain can be modified by changing RS, leaving the closed-loop bandwidth unchanged.7 g+ [4 ]3 `* u7 \# H4 g' w( C
(2) For a given RF, frequency compensation can be optimized.
7 F% \- h6 Q- Z/ M% ]5 A* K4 j(3)Suitable for high frequency applications.
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66#
 樓主| 發表於 2024-9-27 16:33:16 | 只看該作者
silde 1557:
& S6 Q: Y  T# ?0 @3 F1. Input offset: Bipolar is better than MOS8 Q* X, h$ U9 q" m! h: f
KT/C = 26mV << MOS Vov2 \6 r) B. S& C0 T( r9 t% ~
2. Mismatch 造成Randon offset
! T) X5 {1 Z% |* G3. 電路不對稱所造成Systematic offset
67#
 樓主| 發表於 2024-10-17 15:43:59 | 只看該作者
本帖最後由 賴永諭 於 2024-10-17 03:48 PM 編輯 " a* M! C" N# |
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slide 215-216
% F0 r+ l( c- t- ?/ `% e1. Signal 的輸入雜訊直接到輸出
' O9 r8 e+ k* m2. DAC 的輸出雜訊也直接到輸出" n' ^( ^3 u9 j; H  i
3. Quantizer noise 才有noise shaping 到輸出
68#
 樓主| 發表於 2024-10-18 14:26:49 | 只看該作者
slide 218+ D6 ^3 t1 h2 b3 ]- |$ P
1. First order Sigma-Delta patterns in the output spectrum
, Y% r& K5 j+ k& k1 Z=> Idle tones(pattern noise, limit cycles)
0 A$ ]" `0 O, o0 B) B" O% H2. Second order Sigma-delta 輸入太大時還是會不穩定
69#
 樓主| 發表於 2024-11-12 17:58:39 | 只看該作者
slide 1756:
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1.SC積分器的BW=(Feedback factor) X Gm/Ceff; M9 }, z! K: ?
2.Feedback factor=Cf/(Cf+Cs+Cp)=Beta
* S$ H1 B5 {6 b: \3.Ceff=(Cf串(Cs並Cp)): Cf回授電容,Cs取樣電容,Cp 輸入開關電容求和節點處的寄生電容
0 ?. i# @; d2 H" V7 l6 d2 I4.Integration期間的GBW=BetaXGm/Ceff" R$ M( C- v8 \: i3 ~
5.Integration期間的SR=Io/Ceff(Io opamp 輸出電流)' ?" U4 K! B3 h! ?' ~3 [

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