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$ y. \2 ]" `+ h: B& M4 aTwo 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
Two stage ring oscillator analysis文件上傳~~

# R+ e1 U& p) x/ {1 |3 STwo stage ring oscillator analysis文件上傳~~

賴永諭

slide 1010

4 O$ ?2 T2 [. z6 W0 M0 w0 @For a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
5 D/ `+ R& ~) y* m7 z& D6 PThe signal bandwidth is determined by RF and not by the circuit gain.
, U0 I( Z8 C+ Y- Y: y; _- L+ XThe circuit gain is independently set with RS.
9 [8 v  C7 w8 m) d' [The signal bandwidth remains stable for all gain settings .
Even 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.
+ ^! e9 f( }# g% Z% R; \

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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.
# @7 W2 X8 i0 E0 j（3)Suitable for high frequency applications.

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silde 1557：
1. Input offset: Bipolar is better than MOS
KT/C = 26mV << MOS Vov
2. Mismatch 造成Randon offset
/ w% Z: z" \' t# Y3. 電路不對稱所造成Systematic offset