# [SI-LIST] Re: digital vector

• From: "Yoni Tzafrir" <yonitz@xxxxxxxxxxxxx>
• To: <scott@xxxxxxxxxxxxx>, <Andrew.Ingraham@xxxxxx>
• Date: Thu, 24 Apr 2003 13:23:03 +0300

```
hi scott,
i've read a little about E element, and i am a little confused because =
the syntex shloud be:
E xxx n+ n- <VCVS> in+ in- gain <MAX=3D val> <MIN=3D val>
+ <SCALE=3D val> <TC1=3D val> <TC2=3D val><ABS=3D1> <IC=3D val>

and you called the nodes n+ and in+ by the name vector. does it =
specifies more than one node? anyway i don't think that an E element is =
a good solution for what i am trying to do.
to make a long story short:
i have already 2 Hspice models of buffers. the input nodes of those =
buffers are called drv1in, drv1gnd and drv2in, drv2gnd.
in the input of one buffer i want to toggle buffer one with the vector =
010100110, and the second one with 010110111 both with a voltage between =
0 and 1.6V. is there a simple way to do it than:
vdrv1in   drv1in    drv1gnd   PWL (0 0, 1.9n 0, 2.1n 1.6, 3.9n 1.6, =
4.1n 0, 5.9n 0, 6.1n 1.6, 7.9n 1.6, 8.1n 0, 11.9n 0, 12.1n 1.6, 15.9n =
1.6, 16.1n 0, 18n 0 R TD=3D1.8n)
vdrv2in   drv2in    drv2gnd   PWL  ...

note that this simulation is for 2 buffers, but i might want to do it =
with 30 buffers, which can complicate things
Yonatan (Yoni) Tzafrir
*Tel:               (972) - 3 - 7552300 (T/L: 351)
*Fax:          (972) - 3  - 6177130
*Mobile:       (972) -54- 459469
*E-mail:       <mailto:yonitz@xxxxxxxxxxxxx>

-----Original Message-----
From: Scott McMorrow [mailto:scott@xxxxxxxxxxxxx]
Sent: Sunday, April 06, 2003 9:16 PM
To: Andrew.Ingraham@xxxxxx
Cc: Si-List (E-mail)
Subject: [SI-LIST] Re: digital vector

Yoni,

Yes, just as Andy says, you can use a VCVS configured as a unity gain=20
amplifier to re-reference to the local ground, in the same way that you=20
would use one to re-reference a received signal to it's local ground.

Exxxx vector 0 VCVS vector_out local_ground  1

regards

scott

--=20
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com

Ingraham, Andrew wrote:

>I admit to not having used digital vectors....
>
>But can't you just use controlled sources(ex: VCVS), to translate from
>ground-referenced to floating?
>
>Andy
>
>
> =20
>
>>i am simulating in Hspice, using this digital vector. it is the simple
>>way
>>to define a vector (or vectors) of zeros and ones. the problem is that
>>it
>>connects, in the spice netlist, between the node in0 (see file
>>attached) and
>>gnd. but sometimes  one does not want to connect it to gnd but to
>>another
>>node. is there a way to do it?
>>
>>   =20
>>
>
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