Undocumented LTspice - Revision history

Lewispaul: /* Piecewise Linear Sources (PWL) */

2023-03-21T19:59:54Z

‎Piecewise Linear Sources (PWL)

Lewispaul: /* Piecewise Linear Sources (PWL) */

2023-03-21T15:21:08Z

‎Piecewise Linear Sources (PWL)

Analogspiceman: /* Circuit Element Area Multiplier */ clarity

2019-11-24T18:03:07Z

‎Circuit Element Area Multiplier: clarity

Analogspiceman: /* Circuit Element Area Multiplier */

2019-11-24T05:42:36Z

‎Circuit Element Area Multiplier

Analogspiceman: /* Circuit Element Area Multiplier */ typo

2019-11-24T05:16:57Z

‎Circuit Element Area Multiplier: typo

Analogspiceman: /* Miscellaneous Hints and Tricks */ added list of LTspice elements that support the m= area multiplier

2019-11-24T04:52:26Z

‎Miscellaneous Hints and Tricks: added list of LTspice elements that support the m=<value> area multiplier

Analogspiceman: /* OTA */ incorporated new OTA data very recently added to the Help file

2019-11-06T17:26:32Z

‎OTA: incorporated new OTA data very recently added to the Help file

Analogspiceman: /* OTA */

2019-11-06T17:01:27Z

‎OTA

Analogspiceman at 04:23, 4 November 2019

2019-11-04T04:23:31Z

Show changes

Analogspiceman: /* Key Combination */ added cross probing

2019-11-04T04:15:02Z

‎Key Combination: added cross probing

@@ Line 236: / Line 236: @@
 The functions of the scale factors are obvious.&nbsp; When given, each value or time in the <data specification> is multiplied by them.&nbsp; The default for each factor is 1.
-The <data specification> is very flexible.&nbsp; Data can either be provided directly in the statement, or by referring to a file (these are documented features).&nbsp; Further, data can be specified so it is repeated a number of times, or forever (both undocumented).&nbsp; Also, data can be specified in a relative way (undocumented).&nbsp; And finally, specifications can be combined to a certain extent (undocumented).
+The data specification is very flexible.&nbsp; Data can either be provided directly in the statement, or by referring to a file (these are documented features).&nbsp; Further, data can be specified so it is repeated a number of times, or forever (both undocumented).&nbsp; Also, data can be specified in a relative way (undocumented).&nbsp; And finally, specifications can be combined to a certain extent (undocumented).
 The simplest form of a <data specification> is a list of one or more data points.&nbsp; Each point is a pair of a time <t''x''> and a value <v''x''> values.&nbsp; A pair can, but need not be, grouped together by brackets.&nbsp; Using brackets simplifies the reading of longer lists.&nbsp; Also, commas can be used to separate and group data points.

@@ Line 227: / Line 227: @@
 The non-documented PWL statements can be added on a schematic by first adding a normal source from the Component library, and using the Advanced setting of the source to set the function of the source to one of the two available PWL functions.&nbsp; Once the source is placed on the schematic a right-click on the PWL statement allows to edit it.&nbsp; Once the PWL statement has been changed to a non-documented PWL statement it can also be edited by right-clicking on the component symbol.&nbsp; The right-click will then no longer bring up the special window for changing a source function, but the generic component attribute editor.&nbsp; The PWL statement goes into the value field.
-The principle form of the PLW statement is
+The principle form of the PWL statement is
   PWL [VALUE_SCALE_FACTOR=<vsf>]
@@ Line 283: / Line 283: @@
   PWL ( 0 0 1 1 2 1 3 0) TRIGGER V(n001)>1.5
 == Standard Devices ==

@@ Line 580: / Line 580: @@
 ----
 === Circuit Element Area Multiplier ===
-Only the following LTspice elements accept the ''Area Multiplier'' parameter, '''m'''=<value>, where '''m''' is the value by which the element area will be multiplied:
+Only the following LTspice elements accept the device die ''Area Multiplier'' parameter, '''m'''=<value>, where '''m''' is the value by which the element model die area will be multiplied:
 '''C''' (Capacitors), '''D''' (Diodes), '''J*''' (JFETs), '''L''' (Inductors), '''M''' (MOSFETs), '''Q*''' (Bipolar Transistors) '''R*''' (Resistors), '''Z''' (MESFETs and IGBTs).
-<nowiki> </nowiki>'''''* m'''=<value> is an undocumented or poorly documented feature of this element''
+<nowiki> </nowiki>'' '''* m'''=<value> is an undocumented or poorly documented feature of this element''
 ----

← Older revision		Revision as of 05:42, 24 November 2019
Line 585:		Line 585:

	<nowiki> </nowiki>'''''* m'''=<value> is an undocumented or poorly documented feature of this element''		<nowiki> </nowiki>'''''* m'''=<value> is an undocumented or poorly documented feature of this element''
		+

	----		----

@@ Line 580: / Line 580: @@
 ----
 === Circuit Element Area Multiplier ===
+Only the following LTspice elements accept the ''Area Multiplier'' parameter, '''m'''=<value>, where '''m''' is the value by which the element area will be multiplied:
 '''C''' (Capacitors), '''D''' (Diodes), '''J*''' (JFETs), '''L''' (Inductors), '''M''' (MOSFETs), '''Q*''' (Bipolar Transistors) '''R*''' (Resistors), '''Z''' (MESFETs and IGBTs).
@@ Line 588: / Line 587: @@
 ----
 === Alternate Syntax ===

@@ Line 577: / Line 577: @@
 '''A-Devices''' See message #19378 from the LTspice Yahoo users group.
 ----
@@ Line 805: / Line 814: @@
 A netlist line starting with "'''*!LTspice:''' " is now treated as a SPICE directive for LTspice (but a comment in other SPICE programs). - 09/05/06
 = References & Footnotes =

@@ Line 106: / Line 106: @@
-'''<u>Parameters:</u>''' (default values are zero unless otherwise noted)
+'''<u>Parameters:</u>''' (* indicates an undocumented parameter)&nbsp; Note all OTA parameters were undocumented until November 2019.
-* '''Ref''' is the input offset voltage
+* '''Ref''' (default = 0V) is the input offset voltage
-* '''G''' (default = 1) is the raw input "gain" (transconductance), where Vdiff = ( '''Ref''' – V(1,2) ) * V(3,4)&nbsp; and Iraw = '''G''' * Vdiff
+* '''G''' (default = 1u-mho) is the raw input "gain" (transconductance), where Vdiff = ( '''Ref''' – V(1,2) ) * V(3,4)&nbsp; and Iraw = '''G''' * Vdiff
-* '''Iout''' (default = 10u) is the output saturation current, which may be superseded by one or both of
+* '''Iout''' (default = 10uA) is the output saturation current, which may be superseded by one or both of
 ** '''Isrc''' (or '''Isource''', default = '''Iout''') is the output sourcing saturation current
 ** '''Isink''' (a negative number, default = &minus;'''Iout''') is the output sinking saturation current
 *** '''Asym''' is a flag parameter that, if present, enables independent asymmetrical limits for '''Isrc/Isource''' and '''Isink'''
 *** '''Linear''' is a flag parameter that, if present, disables output limiting
-* *'''Ioffset''' is the output offset current
+* *'''Ioffset''' (default = 0A) is the output offset current
 * *'''PowerUp''' (default = true) is a Boolean parameter that if < 0.5 disables all pin 7 output current
 * '''Rout''' (default = 1/Gmin) is the internal output resistance
-* '''Cout''' (default = 0) is the capacitance in parallel with '''Rout'''
+* '''Cout''' (default = 0F) is the capacitance in parallel with '''Rout'''
-* '''Vhigh''' (default = 2) is the positive output "rail" voltage (set to 1e308 to disable limit)
+* '''Vhigh''' (default = 2V) is the positive output "rail" voltage (set to 1e308 to disable limit)
-* '''Vlow''' (default = 0) is the negative output "rail" voltage (set to &minus;1e308 to disable limit)
+* '''Vlow''' (default = 0V) is the negative output "rail" voltage (set to &minus;1e308 to disable limit)
-* '''Rclamp''' (default = 1) is the clamping resistance to the voltage rails
+* '''Rclamp''' (default = 1Ω) is the clamping resistance to the voltage rails
-* '''epsilon''' (default = 1) is the clamping resistance to the voltage rails
+* '''Epsilon''' (default = 0V) is the voltage range to gradually switch in '''Rclamp''' impedance
-* '''EN''' is the voltage noise density
+* '''EN''' (default = 0V/√Hz) is the voltage noise density
-* '''ENk''' is the voltage noise knee frequency
+* '''ENk''' (default = 0Hz) is the voltage noise knee frequency
-* '''IN''' is the current noise density
+* '''IN''' (default = 0A/√Hz) is the current noise density
-* '''INk''' is the current noise knee frequency
+* '''INk''' (default = 0Hz) is the current noise knee frequency
-* '''INcm''' is the common mode (?) current noise density
+* '''INcm''' (default = 0A/√Hz) is the common mode current noise density
-* '''INcmk''' is the common mode (?) current noise knee frequency
+* '''INcmk''' (default = 0Hz) is the common mode current noise knee frequency

@@ Line 637: / Line 637: @@
 * Hold down '''Ctrl''' ''and'' '''Shift''' for ''most'' movement with '''arrow keys'''.
 * Text preceeded with an underscore ("_") character will be displayed as overbarred (for active LOW digital signals).
+* '''Cross Probing''': Clicking '''Alt-Left''' on a label in the plot pane highlights the corresponding node in the schematic (since end of October 2012 release).&nbsp; E.g. clicking '''Alt-Left''' on a label like ''V(n001)'' in the plot pane highlights the ''n001'' node.&nbsp; Clicking '''Alt-Left''' on a label like ''I(R1)'' highlights ''R1'' in the schematic.
 ====Operating Point Data Labels (visible numeric dc bias values)====