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10.6.1 Devices required to be laid out as matched pair
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Most of the time, the following are the type of devices required to be drawn for a good matched pair
**(1) MOS Transistors**
(a) NMOS Matched pair: Two NMOS of same type (same operating voltage and process layers) required to be matched in electrical characteristics. (S: Source, D: Drain, G: Gate)
.. image:: images/mos1.png
:width: 600
:align: center
:alt: NMOS
(b) PMOS Matched pair: Two PMOS of same type (same operating voltage and process layers) required to be matched in electrical characteristics. (S: Source, D: Drain, G: Gate)
.. image:: images/mos2.png
:width: 600
:align: center
:alt: PMOS
**(2) BJT Transistors**
Two BJT transistors (NPNs or PNPs) of same type (same operating voltage and process layers) required to be matched in electrical characteristics: (E: Emitter, B: Base, C: Collector).
.. image:: images/bjt.png
:width: 600
:align: center
:alt: BJT
**(3) Capacitors**
Two identical (same operating voltage and process layers) capacitor (e.g MIM Caps) required to be matched in electrical characteristics. (T1: Capacitor top plate terminal, T2: capacitor's bottom plate terminal).
.. image:: images/cap.png
:width: 600
:align: center
:alt: Capacitors
**(4) Resistors**
Two identical (same operating voltage and process layers) resistors (e.g Poly resistors) required to be matched in electrical characteristics. (T1: resistors one terminal, T2: Resistor's other terminal).
.. image:: images/res.png
:width: 600
:align: center
:alt: Resistors