oscillator

ted780428

我先前都是碰power方面的設計
最近開始玩玩看通訊方面的
- v  ]( S' G+ h# }7 I5 u從最基本的oscillator開始...
: |( `6 o& S9 O也是從類比下手
! @) `: R1 N7 g; t先弄個基本低頻RC震盪
6 z0 [2 x# L$ s; F4 w. T可是在Avanwaves都看不到震盪的波形..
是哪裡需要改進嗎? (我有爬過文..我問題好像很大 = =
9 G* [( ?: m" i! j8 v# x' R
軟體是用Hspice 2004
7 b5 @  V5 M  M4 c: K製程 mm0355v.l

8 l2 J) i, c/ g9 c' y. P*****oscillator*****
.global vdd
.global gnd
6 u1 L/ E" F, n0 {*********Current-References*******
20uA
1 z0 d/ o$ S; ~1 h) X8 ]% ^; E***************OPA*********************
) G5 x6 u, T4 `+ {2 M) c6 Jmp1 1 vin- 2 vdd pch w=24u l=1u m=2
mp2 11 gnd 2 vdd pch w=24u l=1u m=2
mp3 3 3 vdd vdd pch w=6u l=1u m=1
mp4 2 3 vdd vdd pch w=6u l=1u m=1
mp5 5 6 vdd vdd pch w=6u l=1u m=1
8 s+ j  p" h0 Y+ K. h/ x- |mp6 7 6 vdd vdd pch w=6u l=1u m=1
$ e8 X2 ~' o) U) bmp7 6 x8 5 vdd pch w=6u l=1u m=1
6 r- d4 d+ x4 a4 @- G% n) F7 kmp8 12 x8 7 vdd pch w=6u l=1u m=1
- d2 c; `& L. i5 q6 z$ s* |mp9 vout 12 vdd vdd pch w=24u l=1u m=30
mn5 6 x7 1 gnd nch w=12u l=1u m=1
mn6 12 x7 11 gnd nch w=12u l=1u m=1
mn7 1 x2 gnd gnd nch w=4u l=1u m=1
4 Q2 D8 D4 i, z. y. q- Cmn8 11 x2 gnd gnd nch w=4u l=1u m=1
% p! m7 d. M$ e2 y$ P* m& |0 Emn9 vout x2 gnd gnd nch w=24u l=1u m=10
6 `; n9 ~4 |* @4 K2 s: W*mn10 vb3 vb3 gnd gnd nch w=4u l=1u
* Z7 U" M& B7 e" A8 ~# amnc vout 12 vout vout nch w=10u l=0.35u m=100
cl vout gnd 10p
********外部電路*****
/ B/ k! X8 M) u( {, FR1 vin- o1 1k
3 d. z5 p; _5 f; FRF vin- vout 30k
R2 o2 gnd 1k
R3 o3 gnd 1k
; a% O3 @4 o6 l& `5 U# @C1 o1 o2 0.065u
C2 o2 vout 0.065u
5 T& |6 L$ _; }+ y9 N/ ^$ f: q0 EC3 o3 vout 0.065u
*********************
4 ]: ]: y2 k; w; F! l, j2 @vdd vdd gnd 3.3v PWL(0 0, 1n 3.3V)  
: A+ y0 f* A4 {/ j*vin- vin- gnd dc 0 ac 0
*vin+ vin+ gnd dc 0 ac 1
( Z8 Z& V+ X9 o: b4 i# f4 c2 D*.dc vin+ 0v 3.3v 0.1
' G7 ]  P- e6 m3 N/ ]8 Y1 J7 L*.ac dec 10 100 10g
*.IC V(o1) 0v
.print i(mn9) v(vout)
  ~( {* T' h6 B9 V.tran 1u 2m
1 u, V+ R( B0 N- ~.op
! j3 c' t. d6 ^" r/ B% q.option post
.prot
$ Z9 l9 j5 G' p.lib 'mm0355v.l' tt
0 h/ n: G- p6 @- G+ Z1 O9 y. Z.unprot
$ a# X7 }( w4 ~$ k.end