IC Mask Design: Essential Layout Techniques

This appendix contains full chip individual net plots for:
Outputs
Inputs
Ground
Substrate contacts
Powers
ESD ring
Well contacts
Bias
Output Traces
Notice that the source-drain regions for the PMOS devices and the cross-quaded NMOS differential pair are also included, along with the anode and cathode metalization for the ESD diodes.
Simplified Output Traces
This plot shows just the wiring that is associated with the output pads. Notice how the wiring is run symmetrically from the center of each pad to the PMOS devices ensuring even path lengths and identical parasitic capacitances.
Input Traces
This plot shows the symmetry of the amplifier input traces and includes the gate fingers of the input devices. As with the output traces, the inputs are wired symmetrically from the center of the bond pad to ensure balanced trace lengths and identical parasitic capacitance.
Ground Wiring
This plot shows the entire ground wire.
Circuit Ground Wiring
This is a simplified plot of the ground wiring showing only the metal that is used to connect to circuit elements. Notice that the Metal Two wire from bond pad connects in the center of the chip to ensure that the current flowing from each amplifier is evenly distributed.
ESD Ground Wiring
This simplified plot shows the ground wires associated with the ESD protection system. Notice that this wire creates a continuous ring around the active circuitry and that the...