|
目前在研究LC VCO,從前人所提出用hspice 量測V-F曲線的方法得知利用
& r1 t# y9 V. ^.meas tran period trig V(out1) val=0.9 rise=50 targ V(out1) val=0.9 rise=100" e! [! N5 z. G' w$ s
.meas tran f param='50/period'' ^2 \( f6 V- v0 j& x+ ]! K% P
以及搭配.tran 0.1n 100n sweep in 0 1.8 0.1之語法
- Z6 |" @" c4 w( [' H5 E- ]7 y' X) Z: L' M- H/ r8 _
但我照上敘的方法,結果量測的每一點電壓的變化出來的頻率都一樣2 q8 l4 F* L" g5 O( Q/ F4 L
不知是我那邊的語法沒有打好
$ m! O) {( o1 h; ?1 S6 U2 z我的可變電容輸入(in)是用pwl指令,從0v掃到1.8v
5 T; ^& ]/ ~/ \# g" w請各位前輩可給點意見...謝謝 @2 j8 H- L4 h& R9 @
以下是我的spice code: H8 Q8 ]$ k" |
' _& P R. _' ]$ C* j8 L& E
.PARAM
! {: B9 f6 G" X5 J ^8 r.GLOBAL gnd; W& m, J. J1 U2 o; ~+ |6 _
+ vdd1 q" `# [ m) ?7 P/ c2 N
.SUBCKT vco_nm in out1 out2 vbaise
6 v8 [7 h2 i1 f; O; mMM0 out2 out1 vdd vdd pch W=5u L=180n M=80
+ o/ H5 L9 R. C+ [MM1 out1 out2 vdd vdd pch W=5u L=180n M=80
o8 K) I; J7 V: \( VMM5 in out2 in vdd pch W=5u L=180.00n M=150- O/ d8 j, M1 d7 x8 y
MM4 in out1 in vdd pch W=5u L=180.00n M=100
4 \1 S W" j( n& r4 Z& a- ]MM6 net32 vbaise gnd gnd nch W=5u L=180n M=604 h: m% {* `4 d! u4 B* Q
MM2 out2 out1 net32 net32 nch W=5u L=180n M=60
% ^; o, B3 o0 a1 |# N, e& IMM3 out1 out2 net32 net32 nch W=5u L=180n M=60% q: N& }9 Q8 {4 I1 N
LL0 out1 out2 0.8n $[LP]- [# g3 C2 b# Y- U
.ENDS& W Y( {+ u1 }$ I
$ S/ g( T8 X, z
x1 in out1 out2 vbaise vco_nm+ u( ~$ U3 B) k5 c- @, S. ~
v1 gnd 0 dc 0v
4 ^# r& i4 V4 h& ^/ tv2 vdd 0 dc 1.8v
1 u3 d T! i% s* g$ Fv3 in 0 pwl 0n 0v 100n 1.8v & w* s: W- A- R2 @5 ]/ I6 J
v4 vbaise 0 dc 1.8v) t" `2 H0 l, ?5 A
3 D7 P8 h9 w" ?. g" uc1 out1 gnd 0.5p
5 o5 b& s- H+ v2 S0 |* U6 lc2 out2 gnd 0.5p
, T% e) M" c5 Y# W5 V$ T.meas tran period trig V(out1) val=0.9 rise=50 targ V(out1) val=0.9 rise=100
$ j7 T: `' ?1 Y: X0 w5 z+ |.meas tran f param='50/period'
6 k& A% M( G2 X# [: V, n: O, g9 b e
6 Z- {8 B @) a* T% ].tran 0.1n 100n sweep in 0 1.8 0.18 a7 j+ x3 J( w( u
.option post
% a/ D6 g$ T" N3 [% p5 D0 [/ P.end |
|