| Bipolar (NPN) |
| ------------- |
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| Spice Model Information |
| ~~~~~~~~~~~~~~~~~~~~~~~ |
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| - Cell Name: :cell:`sky130_fd_pr_base__npn4` |
| - Model Names: :model:`sky130_fd_pr_base__npnpar1x1`, :model:`sky130_fd_pr_base__npnpar1x2`, :model:`sky130_fd_pr_base__npn_1x1_2p0_hv` |
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| Operating regime where SPICE models are valid |
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| - \|V\ :sub:`CE`\ \| = 0 to 5.0V |
| - \|V\ :sub:`BE`\ \| = 0 to 5.0V |
| - I\ :sub:`CE` = 0.01 to 10 µA/µm\ :sup:`2` |
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| Details |
| ~~~~~~~ |
| |
| 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 |
| - ungated device with emitter 1.0 x 2.0 |
| - poly-gated version with octagonal emitter of A = 1.97 µm\ :sup:`2` |
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| The :model:`sky130_fd_pr_base__npn_1x1_2p0_hv` 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:: bipolar-npn-table0.rst |
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| Symbols for the npnpar are shown below |
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| |symbol-bipolar-npn-1| |symbol-bipolar-npn-2| |symbol-bipolar-npn-3| |
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| The cross-section of the :model:`sky130_fd_pr_base__npnpar1x1`/:model:`sky130_fd_pr_base__npnpar1x2` is shown below. |
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| |cross-section-bipolar-npnpar1x| |
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| The cross-section of the :model:`sky130_fd_pr_base__npn_1x1_2p0_hv` 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-bipolar-npn_1x1_2p0_hv| |
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| .. |symbol-bipolar-npn-1| image:: symbol-bipolar-npn-1.svg |
| .. |symbol-bipolar-npn-2| image:: symbol-bipolar-npn-2.svg |
| .. |symbol-bipolar-npn-3| image:: symbol-bipolar-npn-3.svg |
| .. |cross-section-bipolar-npnpar1x| image:: cross-section-bipolar-npnpar1x.svg |
| .. |cross-section-bipolar-npn_1x1_2p0_hv| image:: cross-section-bipolar-npn_1x1_2p0_hv.svg |
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