| Bipolar (NPN) |
| ------------- |
| |
| Spice Model Information |
| ~~~~~~~~~~~~~~~~~~~~~~~ |
| |
| - Cell Name: :cell:`sky130_fd_pr__npn_05v5` |
| - Model Names: :model:`sky130_fd_pr__npn_05v5`, :model:`sky130_fd_pr__npn_11v0` |
| |
| Operating regime where SPICE models are valid |
| |
| - \|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` |
| |
| 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: |
| |
| - 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` |
| |
| 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. |
| |
| 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: |
| |
| |
| .. include:: npn_05v0-table0.rst |
| |
| |
| |
| Symbols for the :model:`sky130_fd_pr__npn_05v5` are shown below |
| |
| |symbol-npn_05v0-1| |symbol-npn_05v0-2| |symbol-npn_05v0-3| |
| |
| The cross-section of the :model:`sky130_fd_pr__npn_05v5` is shown below. |
| |
| |cross-section-npn_05v0| |
| |
| 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. |
| |
| |cross-section-npn_11v0| |
| |
| .. |symbol-npn_05v0-1| image:: symbol-npn_05v0-1.svg |
| .. |symbol-npn_05v0-2| image:: symbol-npn_05v0-2.svg |
| .. |symbol-npn_05v0-3| image:: symbol-npn_05v0-3.svg |
| .. |cross-section-npn_05v0| image:: cross-section-npn_05v0.svg |
| .. |cross-section-npn_11v0| image:: cross-section-npn_11v0.svg |
| |
