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

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賴永諭 發表於 2024-6-6 11:16 AM
& P/ |7 r7 k7 ETwo stage ring oscillator analysis文件上傳~~

, _! R  X, I& a' jTwo stage ring oscillator analysis文件上傳~~
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slide 1010

9 N4 R" k' K- [2 @5 e4 F( B* t6 G: ~For a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
0 H& x' @0 M6 h; i/ U" P2 fThe signal bandwidth is determined by RF and not by the circuit gain.
The circuit gain is independently set with RS.
The signal bandwidth remains stable for all gain settings .
Even for unity-gain operation, an RF resistor is required.
- }2 q% }9 F5 `5 n. nThe 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.
（3)Suitable for high frequency applications.

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silde 1557：
- W, d' O# ~9 D' a1. Input offset: Bipolar is better than MOS
KT/C = 26mV << MOS Vov
6 l- u9 M- O" ^) r6 |0 C2. Mismatch 造成Randon offset
# r% v# X" G  F7 K" H3 \3. 電路不對稱所造成Systematic offset