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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~
) r& N  U/ V' W; e1 l! PTwo stage ring oscillator analysis" e! ?  D7 I4 r& @
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 & Z8 A7 @; l, m
賴永諭 發表於 2024-6-6 11:16 AM
5 w/ p& \( B8 B8 |, fTwo 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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" y, y; j  U. F: h" G0 tFor a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF. , X8 z/ i0 b) e& F$ ?: ~0 }. u: Z7 q
The signal bandwidth is determined by RF and not by the circuit gain.
) e- X( ^2 M6 R8 uThe circuit gain is independently set with RS.% Y9 c  X/ I6 q. w& M
The signal bandwidth remains stable for all gain settings .
6 G; z+ B; M/ o+ v! V6 N+ A1 wEven for unity-gain operation, an RF resistor is required.. r8 q+ B! Z+ T2 U0 p( U
The 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 10205 f+ `5 u. O3 ]0 w2 F
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(1) The closed-loop gain can be modified by changing RS, leaving the closed-loop bandwidth unchanged.
5 b' i! b8 f: Y, K+ k6 V(2) For a given RF, frequency compensation can be optimized.
. Z+ \( a6 |4 P% d  Q( C(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:/ x, y# }  E+ J- q
1. Input offset: Bipolar is better than MOS
9 w: a" i2 o6 _* A8 a; pKT/C = 26mV << MOS Vov. ~/ y- d& t4 m9 p1 O- c
2. Mismatch 造成Randon offset
% s7 t0 p6 v5 y  G' F9 H3. 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 3 ?% a; O% i: {1 u7 e* ~7 f9 B
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slide 215-216' v% ?6 S0 n% d$ |9 j1 g8 M* F
1. Signal 的輸入雜訊直接到輸出; y# K7 v- R& B  J: a
2. DAC 的輸出雜訊也直接到輸出
0 b- ?9 K) e# U4 g" }4 [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
; N% D4 W3 v) `9 h1. First order Sigma-Delta patterns in the output spectrum( f' E* n( g: ^
=> Idle tones(pattern noise, limit cycles)
4 B4 m; l! K! r# O* \/ C7 W2. 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
* @% ?- S* J, X: E+ L2.Feedback factor=Cf/(Cf+Cs+Cp)=Beta! ^1 S4 z! G$ ?* ~
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
% C+ I) ^; {, Q# n9 g9 h3 X* |4.Integration期間的GBW=BetaXGm/Ceff
& b: q- t- M5 p% w  d/ J( _7 A5.Integration期間的SR=Io/Ceff(Io opamp 輸出電流)  `7 _7 F/ Y; n* b4 V1 @5 Q

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