X-Authentication-Warning: delorie.com: mail set sender to geda-help-bounces using -f X-Recipient: geda-help AT delorie DOT com From: John Doty Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-7--510736905 Subject: Re: [geda-help] IC directive do nothing ? Date: Wed, 15 May 2013 11:21:26 -0600 In-Reply-To: To: geda-help AT delorie DOT com References: Message-Id: <4A0045A7-EACF-4BF9-8A88-393DDF9FE6C3@noqsi.com> X-Mailer: Apple Mail (2.1085) Reply-To: geda-help AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-help AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk --Apple-Mail-7--510736905 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On May 15, 2013, at 10:56 AM, Julio Ariel Romero P=E9rez wrote: > .IC V(C1)=3D4.5 >=20 .IC sets node voltages, not device voltages. So you've set the voltage = in the node "C1" to 4.5V, but nothing in the circuit is connected to a = node of that name. I don't see the TRAN command that GspiceUI issued, = but it apparently included the UIC option, as all node voltages are = initially zero. Most likely what you want is to set one or both of the nodes connected = to C1 ("2" and "vout2") with .IC, and then run your analysis without the = UIC option. That sets only the specified nodes, allowing the operating = point analysis to find consistent voltages for the nodes you don't = specify. See section 15.2.2 at = http://ngspice.sourceforge.net/docs/ngspice-manual.pdf John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ jpd AT noqsi DOT com --Apple-Mail-7--510736905 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1

.IC = V(C1)=3D4.5

.IC sets = node voltages, not device voltages. So you've set the voltage in the = node "C1" to 4.5V, but nothing in the circuit is connected to a node of = that name. I don't see the TRAN command that GspiceUI issued, but = it apparently included the UIC option, as all node voltages are = initially zero.

Most likely what you want is to = set one or both of the nodes connected to C1 ("2" and "vout2") with .IC, = and then run your analysis without the UIC option. That sets only the = specified nodes, allowing the operating point analysis to find = consistent voltages for the nodes you don't specify. See = section 15.2.2 at http://ngs= pice.sourceforge.net/docs/ngspice-manual.pdf

John Doty Noqsi = Aerospace, Ltd.

http://www.noqsi.com/

jpd AT noqsi DOT com

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