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賴永諭

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4 T5 ]9 F* U1 I5 a+ ?* Z4 U1 o' nTwo stage ring oscillator analysis

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Two stage ring oscillator analysis文件上傳~~
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賴永諭

賴永諭 發表於 2024-6-6 11:16 AM
+ X; C# T0 d+ l# U; a, aTwo stage ring oscillator analysis文件上傳~~

Two stage ring oscillator analysis文件上傳~~

賴永諭

slide 1010

For a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
The signal bandwidth is determined by RF and not by the circuit gain.
8 ]2 o) g7 N3 F; a6 x( m' nThe circuit gain is independently set with RS.
5 G1 g$ \8 t- }" mThe signal bandwidth remains stable for all gain settings .
- `& \' m* L: G- e8 eEven for unity-gain operation, an RF resistor is required.
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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slide 1020

（1) The closed-loop gain can be modified by changing RS, leaving the closed-loop bandwidth unchanged.
（2) For a given RF, frequency compensation can be optimized.
  S+ W% {& S$ {4 m! r  \' B/ K（3)Suitable for high frequency applications.
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silde 1557：
1. Input offset: Bipolar is better than MOS
/ e) \8 Z) I  q1 v- {KT/C = 26mV << MOS Vov
2. Mismatch 造成Randon offset
3. 電路不對稱所造成Systematic offset

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slide 215-216
1. Signal 的輸入雜訊直接到輸出
2. DAC 的輸出雜訊也直接到輸出
3. Quantizer noise 才有noise shaping 到輸出

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slide 218
6 W; Y. [3 O; x7 Q1. First order Sigma-Delta patterns in the output spectrum
=> Idle tones(pattern noise, limit cycles)
2. Second order Sigma-delta 輸入太大時還是會不穩定

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slide 1756：

1.SC積分器的BW=(Feedback factor) X Gm/Ceff
  ?) ~) g: @1 q  S# R2.Feedback factor=Cf/(Cf+Cs+Cp)=Beta
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
5 ?* z7 A6 s  B2 {! D# {# x4.Integration期間的GBW=BetaXGm/Ceff
5.Integration期間的SR=Io/Ceff(Io opamp 輸出電流）
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