Chip123 科技應用創新平台

 找回密碼
 申請會員

QQ登錄

只需一步,快速開始

Login

用FB帳號登入

搜索
1 2 3 4
樓主: 賴永諭
打印 上一主題 下一主題

[問題求助] Sansen讀書會...

  [複製鏈接]
61#
 樓主| 發表於 2024-6-6 11:12:29 | 只看該作者
Update 文件~
; I: n( \; B$ X; p  p$ e5 z0 Z3 h$ xTwo stage ring oscillator analysis
3 U" S9 Z; H2 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~~# |+ {" V* e! |& R: F' j
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
1 ]* [5 L1 h8 k% \: C
賴永諭 發表於 2024-6-6 11:16 AM
+ B' w" ~  N+ I+ \9 Q) _& a- W+ gTwo stage ring oscillator analysis文件上傳~~

7 g" L( z/ m6 T: @Two stage ring oscillator analysis文件上傳~~' T- c2 x5 ?. {" [( g9 \5 y9 m9 Y, ^
64#
 樓主| 發表於 2024-8-30 17:19:57 | 只看該作者
slide 1010; {$ a0 ~# W& d

  i( \# p: Q" e0 J$ h0 WFor a CFB amplifier the open-loop gain is ZT and its feedback factor is 1/RF, making the loop-gain TCFB = ZT/RF.
$ }% A# e- ^, C) a2 CThe signal bandwidth is determined by RF and not by the circuit gain.
9 O( K) h3 y1 L3 p/ b4 yThe circuit gain is independently set with RS.5 J8 y3 X- c( p# ^1 C1 L- U
The signal bandwidth remains stable for all gain settings .
" v7 R5 T/ u5 ]3 w3 _8 o5 Z+ cEven for unity-gain operation, an RF resistor is required.
. d2 @/ a( a' a+ e! E$ [4 G% QThe 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.
. z8 X) l0 x# u
65#
 樓主| 發表於 2024-9-9 10:21:54 | 只看該作者
slide 1020
* ~7 z: {% c1 i( |$ j
: O( \. l2 ?- w! Y  |, C(1) The closed-loop gain can be modified by changing RS, leaving the closed-loop bandwidth unchanged.8 E2 {3 W" L* F# s1 }2 J
(2) For a given RF, frequency compensation can be optimized.7 W" e+ D' k6 `2 x& B- }
(3)Suitable for high frequency applications.4 `- z1 M% C- l; D! n) f3 m$ F
66#
 樓主| 發表於 2024-9-27 16:33:16 | 只看該作者
silde 1557:
% q& X" f. @- y! ~) j6 u4 V" }1. Input offset: Bipolar is better than MOS: v/ g5 w$ U  x( |0 m2 R- j
KT/C = 26mV << MOS Vov
  L( p% Q; m. O6 m( L* m' R2. Mismatch 造成Randon offset 3 U/ |( o1 D4 o# R3 C; K' ]
3. 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
1 n% n7 ^8 Q. w" c# n# N- t6 {4 R$ {7 `* K) F4 x
slide 215-216: f4 e# }+ j( ~
1. Signal 的輸入雜訊直接到輸出& U7 m% ?& h( N5 A+ u
2. DAC 的輸出雜訊也直接到輸出
3 r; a2 T8 K( K" h) K; @7 \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
3 D8 C% P% x& e$ U1. First order Sigma-Delta patterns in the output spectrum
3 B" s! W5 D& T$ ?=> Idle tones(pattern noise, limit cycles)
) w* W! I( T: Q9 b5 q2. 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:; I% A8 B2 X7 R$ K
$ v7 J* U" f; c. m9 I4 U6 g0 Y/ O% z
1.SC積分器的BW=(Feedback factor) X Gm/Ceff
0 ~% g4 K$ @$ p2 m% L) N2.Feedback factor=Cf/(Cf+Cs+Cp)=Beta
: j' f9 r/ Y& |7 h3 a% [# D3.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
* W- |$ `. ~# o' v4.Integration期間的GBW=BetaXGm/Ceff
3 @, Y) t+ W; l/ y! K3 n) F5.Integration期間的SR=Io/Ceff(Io opamp 輸出電流)
1 f. `  m! r1 c- s% V
% b& j# }1 e2 d3 Z1 Z! r
您需要登錄後才可以回帖 登錄 | 申請會員

本版積分規則

首頁|手機版|Chip123 科技應用創新平台 |新契機國際商機整合股份有限公司

GMT+8, 2024-12-6 08:28 AM , Processed in 0.163010 second(s), 16 queries .

Powered by Discuz! X3.2

© 2001-2013 Comsenz Inc.

快速回復 返回頂部 返回列表