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樓主: 賴永諭
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[問題求助] Sansen讀書會...

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61#
 樓主| 發表於 2024-6-6 11:12:29 | 只看該作者
Update 文件~1 s. N1 x' v0 |8 M/ E
Two stage ring oscillator analysis/ w3 c) @) v7 W2 `7 W4 V) v
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~~$ Y2 @+ }) W! v8 b% M
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
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賴永諭 發表於 2024-6-6 11:16 AM% n" N4 A* B- b4 q
Two stage ring oscillator analysis文件上傳~~

6 L2 l3 M0 v$ x6 u- j. cTwo 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( r5 J9 @. l; C4 o1 P
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For a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF. 8 _" b1 z0 {' ?' ?
The signal bandwidth is determined by RF and not by the circuit gain.1 H, D6 W  r( W7 V$ s
The circuit gain is independently set with RS./ e; [9 b2 b0 ]( J
The signal bandwidth remains stable for all gain settings .
5 C' l  @0 X# \3 Y. K9 W! XEven for unity-gain operation, an RF resistor is required.
* ]" t4 P7 j# ^& g- t/ ]5 pThe 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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5 I0 W( J$ q+ l* T3 {1 W+ y2 Z- S(1) The closed-loop gain can be modified by changing RS, leaving the closed-loop bandwidth unchanged.
  U! n1 f3 P, w0 R(2) For a given RF, frequency compensation can be optimized.
  Y8 q+ k3 e2 n( z& @(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:" c: ^" r& k0 U+ q! o$ ], a" Q
1. Input offset: Bipolar is better than MOS
* H3 L' [& m% ]4 H0 s/ ]; \# \. d( fKT/C = 26mV << MOS Vov
: ]$ M  z% |$ d: y! X2. Mismatch 造成Randon offset
, z  _) X; T1 t2 ^* O3. 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 & W( B+ s8 d# o! c/ X- Y
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slide 215-216, r1 L$ Z1 H$ y$ ?3 \* x
1. Signal 的輸入雜訊直接到輸出- D6 P7 u% ?8 H% s4 i) q
2. DAC 的輸出雜訊也直接到輸出
1 X1 Z4 b) u/ W( ?- H+ Q3. 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# p* [+ s3 W/ a
1. First order Sigma-Delta patterns in the output spectrum- E$ x, W9 g6 v' w8 X, c
=> Idle tones(pattern noise, limit cycles)
8 X4 z4 F* \9 L, o1 M  t2. 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:
* D$ e* ^0 [* U8 o/ d/ ~5 X' ]6 \
+ o  ^& R4 B& K; j1.SC積分器的BW=(Feedback factor) X Gm/Ceff
. _/ x; F" k% c  j8 _9 M9 y+ K2.Feedback factor=Cf/(Cf+Cs+Cp)=Beta- s+ V8 \( O! z2 ?. l! e3 K, E6 R
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
  T& \2 x0 X* z% B4 E4.Integration期間的GBW=BetaXGm/Ceff
- l; Y' d' k& W- P9 \, ~0 q5.Integration期間的SR=Io/Ceff(Io opamp 輸出電流)( `  x& K: ]' L' @5 Y
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