52 lines
2.0 KiB
ReStructuredText
52 lines
2.0 KiB
ReStructuredText
Bipolar NPN transistor
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----------------------
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Spice Model Information
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~~~~~~~~~~~~~~~~~~~~~~~
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- Cell Name: :cell:`sky130_fd_pr__npn_05v5`
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- Model Names: :model:`sky130_fd_pr__npn_05v5`, :model:`sky130_fd_pr__npn_11v0`
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Operating regime where SPICE models are valid
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- :math:`|V_{CE}| = 0` to 5.0V
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- :math:`|V_{BE}| = 0` to 5.0V
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- :math:`I_{CE} = 0.01` to 10 µA/µm\ :sup:`2`
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Details
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~~~~~~~
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The SKY130 process offers “free” NPN devices. The NPN uses the deep n-well as the collector. The device is not optimized, and must be used in the forward-active mode. The following sizes of NPN’s are available:
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- ungated device with emitter 1.0 x 1.0
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- ungated device with emitter 1.0 x 2.0
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- poly-gated version with octagonal emitter of A = 1.97 µm\ :sup:`2`
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The :model:`sky130_fd_pr__npn_11v0` device has a poly gate placed between the emitter and base diffusions, to prevent carrier recombination at the STI edge and increase β. The poly gate is connected to the emitter terminal.
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Using this device must be done in conjunction with the correct guard rings, to avoid potential latchup issues with nearby circuitry. Reverse-active mode operation of the BJT’s are neither modeled nor permitted. E-test specs for the NPN devices are shown in the table below:
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.. include:: npn_05v0-table0.rst
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Symbols for the :model:`sky130_fd_pr__npn_05v5` are shown below
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|symbol-npn_05v0-1| |symbol-npn_05v0-2| |symbol-npn_05v0-3|
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The cross-section of the :model:`sky130_fd_pr__npn_05v5` is shown below.
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|cross-section-npn_05v0|
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The cross-section of the :model:`sky130_fd_pr__npn_11v0` is shown below. The poly gate is tied to the emitter to prevent the parasitic MOSFET from turning on.
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|cross-section-npn_11v0|
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.. |symbol-npn_05v0-1| image:: symbol-npn_05v0-1.svg
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.. |symbol-npn_05v0-2| image:: symbol-npn_05v0-2.svg
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.. |symbol-npn_05v0-3| image:: symbol-npn_05v0-3.svg
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.. |cross-section-npn_05v0| image:: cross-section-npn_05v0.svg
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.. |cross-section-npn_11v0| image:: cross-section-npn_11v0.svg
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