57 lines
2.4 KiB
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57 lines
2.4 KiB
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P- poly precision resistors
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Spice Model Information
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~~~~~~~~~~~~~~~~~~~~~~~
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- Cell Name: :cell:`res_xhigh_po_XpXX`, :cell:`sky130_fd_pr__res_xhigh_po`
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- Model Type: subcircuit
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Operating ranges where SPICE models are valid
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- \|V\ :sub:`r0` – V\ :sub:`r1`\ \| = 0 to 5.0V
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- Currents up to 500 µA/µm of width (preferred use ≤ 100 µA/µm)
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Details
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~~~~~~~
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The resistors have 5 different fixed widths, plus a variable W/L option.
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- 0.35 (0p35)
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- 0.69 (0p69)
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- 1.41 (1p41)
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- 2.85 (2p83)
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- 5.73 (5p73)
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They are modeled as subcircuits, using a conventional resistor model combined with the capacitance under the resistor, as well as matching parameters and temperature coefficients. The fixed-width resistors may only be used in the above configurations. Each resistor end is contacted using a slot licon. Length is variable and measured between the front ends of the slot licons.
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The resistors are modeled using the same equations as for the P+ poly resistors. In the case of the P- poly resistors, a separate implant is used to set the sheet resistance to 2000 ohm/sq.
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Fixed value resistors have the same layout footprints as their P+ poly counterparts. Electrical and e-test specs are still TBD, once sufficient silicon has been evaluated. More details on the use of the precision resistors, and their models, are in the document ***SKY130 process Family Device Models*** (002-21997), currently under development.
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The symbols for the 2000 ohm/sq precision resistors are shown below:
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|symbol-res_xhigh_po_0p35| |symbol-res_xhigh_po_0p69|
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:model:`sky130_fd_pr__res_xhigh_po_0p35` :model:`sky130_fd_pr__res_xhigh_po_0p69`
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|symbol-res_xhigh_po_1p41| |symbol-res_xhigh_po_2p85|
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:model:`sky130_fd_pr__res_xhigh_po_1p41` :model:`sky130_fd_pr__res_xhigh_po_2p85`
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|symbol-res_xhigh_po_5p73|
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:model:`sky130_fd_pr__res_xhigh_po_5p73`
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A generic version of the poly resistor is also available, which permits user inputs for W and L, and connections in series or parallel.
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|symbol-res_xhigh_po|
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.. |symbol-res_xhigh_po_0p35| image:: symbol-res_xhigh_po_0p35.svg
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.. |symbol-res_xhigh_po_0p69| image:: symbol-res_xhigh_po_0p69.svg
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.. |symbol-res_xhigh_po_1p41| image:: symbol-res_xhigh_po_1p41.svg
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.. |symbol-res_xhigh_po_2p85| image:: symbol-res_xhigh_po_2p85.svg
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.. |symbol-res_xhigh_po_5p73| image:: symbol-res_xhigh_po_5p73.svg
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.. |symbol-res_xhigh_po| image:: symbol-res_xhigh_po.svg
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