docs/ULL/physical_verification/design_manual/drm_08.rst

8.0 ANTENNA RATIO RULES 
=================================

An antenna includes all conducting structures on the same layer and the same electrical node that connect to an
active area only via layers below it. No antenna related rule for TaN resistor

 .. csv-table:: ANT
    :file: tables_clear/8.0_ANT_rules.csv
    :widths: 100, 200 , 300

**NOTES**

(1) Following diodes can be used as Antenna diodes:

 .. csv-table:: ANT2
    :file: tables_clear/8.0_ANT_notes.csv
    :widths: 100, 200 , 300

(2) Other Possible repairs if the Antenna ratio violate the design rule is break the metal close to the gate and jog the metal
to an upper metal level

.. image:: images/ANT.png
    :width: 800
    :align: center
    :alt: ANT


.. image:: images/Ant2.png
    :width: 800
    :align: center
    :alt: ANT2

**Example:**

Illustration on the above antenna ratio calculation: (Terms on the right hand side of the equations below (eg. Metal3) refer to the layout areas of the corresponding structures in the diagram above.)

.. math::

    Antenna_ratio (Metal_3)  = Metal_3/(Poly_{2A} + Poly_{2B} + Poly_{2C})

    Antenna_ratio (M2A)      = Metal_{2A}/(Poly_{2A} + Poly_{2B})

    Antenna_ratio (M2B)      = Metal_{2B}/Poly_{2C}


**Poly2/Metal Perimeter Area calculation**

.. image:: images/poly_area_calc.png
    :width: 900
    :align: center
    :alt: Area calculation

.. math::

    Poly2/Metal Perimeter Area = 2 [(t X z) + (t X y)]

Where

       y: Poly2/Metal length

       z: Poly2/Metal width

       t: Poly2/Metal thickness

.. csv-table::
    :file: tables_clear/8.0_ANT_metalthickness1.csv
    :widths: 100, 100, 100, 100, 100, 100, 100, 100, 100, 100
    :align: center