Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Correct method to measure negative resistive XOSC

Status
Not open for further replies.

hung_wai_ming@hotmail.com

Full Member level 6
Joined
Jan 5, 2004
Messages
382
Helped
52
Reputation
104
Reaction score
11
Trophy points
1,298
Activity points
2,464
Hi ALL

Here are the hspice script. Assume X1 is the INPUT, X2 is the OUTPUT. Ignore crystal model and include shunt cap

**Global setting for method 1 & 2
.param pwr=3.3v
.ic v(x1)="pwr/2"
.ic v(x2)="pwr/2"

Method 1
.ac lin 30000 3950000 4050000
.net v(x2) vin rout=50 rin=50
cin in x1 0.1 $ ac couple
vin in 0 ac=1
.probe negr=par('z11(r)+z22(r)-z21(r)-z12(r)')

Method 2
.ac lin 30000 3950000 4050000
ixtal x1 x2 dc=0 ac=1
.probe ac vr(x2,x1)

both results are close but NOT the same. Can anyone tell me which one is correct?
 

m2 should be right,
For method1, see my reply in this topic:
 

just measure the input impendence between the two ports: X1,X2
.net define the two ports, .probe zin(r) zin(i), zin(r) is real part of input impendence, zin(i) is the img part.

you can find the key words in Hspice manual.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top