vco spice model

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Subject

Author

Date

vco spice model

Matt Flax

06-24-05

Jim Thompson

Joerg

Jim Thompson

Robert

Posted by Matt Flax on June 24, 2005, 6:47 am

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Hello,

I am after a spice model for a voltage to frequency converter.

Does anyone have one handy ?

I have checked some of the manufacturer pages, but none seem to exist !
For example :
http://www.analog.com/en/prod/0,2877,AD537,00.html

thanks
--
Matt

When replying remove the 'DOT'

Posted by Jim Thompson on June 25, 2005, 11:21 am

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wrote:

>Hello,
>
>I am after a spice model for a voltage to frequency converter.
>
>Does anyone have one handy ?
>
>I have checked some of the manufacturer pages, but none seem to exist !
>For example :
>http://www.analog.com/en/prod/0,2877,AD537,00.html
>
>thanks

In PSpice, other simulators may require editing notation style...

******************************************************************
..SUBCKT VCO_BEH VCONT OUT F PARAMS: FMAX=200Meg
+ VMAX=2V FMIN=100Meg VMIN=1V
..PARAM PI = 3.141593
G_G1 VC N_1 VALUE { 1+ TANH(80*V(VC, N_1)) }
G_G2 N_2 VC VALUE { 1+ TANH(80*V(N_2, VC)) }
R_R1 N_3 VC 10K
E_BUF1 N_3 0 VCONT 0 1
G_INTEG1 0 $$U_INTEG1 VALUE
C_INTEG1 $$U_INTEG1 0
R_INTEG1 $$U_INTEG1 0 1G
E_INTEG1 OUT 0 VALUE
.IC V($$U_INTEG1) = 0v
R_R2 F 0 1K
V_V2 N_2 0
V_V1 N_1 0
R_R3 OUT 0 1K
R_R4 OMEGA 0 1K
E_E1 F 0 VALUE
+
E_E2 OMEGA 0 VALUE { 2*PI*(V(F, 0)) }
..ENDS VCO_BEH
******************************************************************

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Posted by Joerg on June 26, 2005, 12:51 am

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Hello Jim,

Wasn't there a law that, at least for the state of Indiana:
..PARAM PI = 4?

Regards, Joerg

http://www.analogconsultants.com

Posted by Jim Thompson on June 25, 2005, 5:58 pm

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On Sat, 25 Jun 2005 21:51:11 GMT, Joerg

>Hello Jim,
>
>Wasn't there a law that, at least for the state of Indiana:
>.PARAM PI = 4?
>
>Regards, Joerg
>
>http://www.analogconsultants.com

Posted by Robert on June 26, 2005, 10:52 pm

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>>Hello Jim,
>>
>>Wasn't there a law that, at least for the state of Indiana:
>>.PARAM PI = 4?
>>
>>Regards, Joerg
>>
>>http://www.analogconsultants.com

>
> I think it was indeed Indiana, but it was pi = 3, and only applied to
> small circles ;-)
>
> ...Jim Thompson

Snopes says the modern hoax is about Alabama but does mention (at the
bottom) the bit about Indiana. They said it was passed in the Indiana House
but died in the Senate.

http://www.snopes.com/religion/pi.htm

Robert

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Electronics Computer-Aided Design vco spice model