Original author(s) | Mike Engelhardt[1] |
---|---|
Developer(s) | Linear Technology,Analog Devices[2] |
Initial release | October 1999[1] |
Stable release | |
Operating system | Windows 7, 8, 8.1, 10,macOS 10.7+ |
Platform | IA-32, x86-64 |
Size | Windows (41 MB),MacOS (101 MB) |
Available in | English |
Type | Electronic design automation |
License | Freeware[4][5] |
Website | LTspice webpage |
Sym. & Lib. Search Paths
.[16]e
' for scientific e-notation or a scale factor suffix (left column of table), then trailing characters are ignored.[17] For example, 5 is treated the same as 5V / 5Volt / 5Volts / 5 Hz / 5Hertz.SPICE Suffix[17] | Metric Name | English Name | Power of 10 | Numeric Value | Notes and Common Mistakes |
---|---|---|---|---|---|
T | tera | Trillion | 1012 | 1000000000000 | |
G | giga | Billion | 109 | 1000000000 | |
MEG | mega | Million | 106 | 1000000 | Wrong use of m / meg / mil are common mistakes in all SPICE programs |
K | kilo | Thousand | 103 | 1000 | |
m | milli | Thousandth | 10−3 | 0.001 | '1m' & '1M' doesn't mean '1 megaohm, instead '1MEG' is correct[17] |
u or µ | micro | Millionth | 10−6 | 0.000001 | Older SPICE software doesn't support the µ (Mu) character[16] |
n | nano | Billionth | 10−9 | 0.000000001 | |
p | pico | Trillionth | 10−12 | 0.000000000001 | |
f | femto | Quadrillionth | 10−15 | 0.000000000000001 | '1f' & '1F' doesn't mean '1 farad, instead '1' is correct[17] |
mil | thou | 25.4 x 10−6 | 0.0000254 | mil is a thousandth of an inch (0.001') which is 25.4 μm[17] |
Convert 'µ' to 'u'
.[16]Accept 3K4 as 3.4K
.[16]'a'
for 'atto' 10−18, which must be replaced with 'e-18'
to be compatible with LTspice and other SPICE software.'X'
as a synonym for 'meg' 106, which must be replaced with 'e6'
or 'MEG'
to be compatible with LTspice and other SPICE software.Label Net
tool button or F4
key. The 'Label Net' wizard has three choices for a label, two predefined graphical symbols (GND, COM), or a user-defined node/net name.[18]GND
- The ground symbol assigns a node with a special global net name of '0'.[18]COM
- The COM symbol assigns a node with a net name of 'COM', which doesn't have any special significance.[18]_
- An underscore causes an overbar to be placed above the entire name, which commonly means an active low signal. For example, '_RESET' is shown on the schematic as 'RESET'.[19]$G_
- This means a node is global, no matter where the name occurs in the circuit hierarchy. For example, '$G_ENABLE' / '$G_ERROR'. It should be noted the ground symbol is treated in a similar way, but it doesn't have '$G_' prepended to it.[18]None
- Bare text. This is the default.[20]Global
- 'Rectangle' around the text. This is automatically shown for a global net name that starts with '$G_'.[20]Input
- 'Rectangle with triangle end' around the text. This is chosen by the 'Port Type' field in the 'Label Net' wizard.[20]Output
- 'Rectangle with triangle on other end' around the text. This is chosen by the 'Port Type' field in the 'Label Net' wizard.[20]Bidirectional
- 'Rectangle with triangle on two ends' around the text. This is chosen by the 'Port Type' field in the 'Label Net' wizard.[20]asc
- schematic. It consists of a netlist based on SPICE text-based commands.[21]asy
- electronic symbol shown in a schematic.[21]cir
- external netlist input.[21]fft
- FFT binary output.[21]lib
- model library subcircuits.[22]plt
- waveform viewer plot settings.[21]raw
- binary output, optional ASCII output.[21]sub
- subcircuit.[22]lib
/ sub
/ mod
/ model
- device model. While any file extension is allowed, users tend to gravitate towards common ones.[21]asc
'.[21].tran 10mS
), 2) a SPICE directive to set the initial condition of RC 'out' net to zero volts (.ic v(OUT)=0V
), and 3) a text comment (title).plt
'.[21] If this optional plot file is present, then all plot planes will automatically be displayed after the 'Run' button is pressed, otherwise the user will need to click on each net to see the waveform(s). To create a plot file on Windows, after a plot graph is displayed, right-click on it and choose 'File', then choose 'Save Plot Settings'.[23]
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