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ravet
Joined: 17 Sep 2006
Posts: 114
Helped: 2
Location: DSO
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 28 Sep 2006 9:12 VCO tuning range plotting |
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[size=18]
Hello
how can i simulate the tuning range of the vco, frequency vs control voltage , using cadence spectre??
Last edited by ravet on 12 Oct 2006 14:53; edited 1 time in total |
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28 Sep 2006 9:12 Ads |
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aomeen
Joined: 08 Dec 2005
Posts: 119
Helped: 19
Location: Egypt
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28 Sep 2006 9:27 Re: coil and varactor simulation |
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| To simulate Inductor you need use S-Param simulation... You can find expressions for L and Q in terms of S11,S12,etc. Similarly you can make sweep on voltage applied to a varactor, and plot imag(Y11), which is the capacitance...
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Grig
Joined: 03 Sep 2004
Posts: 227
Helped: 26
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06 Oct 2006 12:35 Re: coil and varactor simulation |
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You need simulate Y(1,2) for series inductor or varactor
if varactor shunt then you need Y(1,1)
for inductor L=imag(-1/Y(1,2))/2/pi/freq (Henry) Q=imag(-Y(1,2))/real(Y(1,2))
for var C=imag(-Y(1,2))/2/pi/freq Q=imag(Y(1,2))/real(Y(1,2))
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sengyee88
Joined: 09 Oct 2006
Posts: 124
Helped: 20
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12 Oct 2006 16:23 Re: VCO tuning range plotting |
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Try this
h**p://www.edaboard.com/ftopic197375.html
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sarath451
Joined: 12 Oct 2006
Posts: 1
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12 Oct 2006 16:49 Re: VCO tuning range plotting |
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| You need simulate Y(1,2) for series inductor or varactor ,if varactor shunt then you need Y(1,1),for inductor L=imag(-1/Y(1,2))/2/pi/freq (Henry) Q=imag(-Y(1,2))/real(Y(1,2)) ,for var C=imag(-Y(1,2))/2/pi/freq Q=imag(Y(1,2))/real(Y(1,2))
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lijianheng
Joined: 29 Sep 2006
Posts: 130
Helped: 10
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13 Oct 2006 3:26 Re: VCO tuning range plotting |
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You can use the PSS analysis, enable the sweep button and choose the parameter of voltage.
See the result in harmonic, then you can see the curve.
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tsinghua
Joined: 30 Dec 2003
Posts: 225
Helped: 18
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14 Oct 2006 7:13 VCO tuning range plotting |
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PSS is very slow, if there are a lot of sweep points.
I like to invoke the sweep tool, run tran simulations and extract a frequency estimation by using freq function.
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shaikhsarfraz
Joined: 08 Aug 2006
Posts: 309
Helped: 19
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17 Oct 2006 5:55 Re: VCO tuning range plotting |
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Hi,
For plotting VCO tuning curve
perform PSS analysis with sweeping Vcontrol as the the parametric variable.
thanks
sarfraz
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czn
Joined: 30 Nov 2004
Posts: 27
Helped: 1
Location: taiwan
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17 Oct 2006 9:40 VCO tuning range plotting |
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1.set the parametric variable (control voltage ex:Vt)
2.sweep the Vt with "transient analysis"
3.plot "output"
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nickoo
Joined: 15 Sep 2004
Posts: 15
Helped: 4
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18 Oct 2006 3:40 VCO tuning range plotting |
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Simple eg:
.tran 0.1p 100n Sweep Vctrl 0.7 2.7 0.1
~~~
.meas FreqVcoout
open awaves to view FreqVco~Vctrl
it work well
GOOD LUCK
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liangshangquan
Joined: 25 Jul 2006
Posts: 6
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04 Jan 2007 13:37 VCO tuning range plotting |
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| set a variable to a node ,sweep the trans
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