10.6.1 Devices required to be laid out as matched pair

Most of the time, the following are the type of devices required to be drawn for a good matched pair

(1) MOS Transistors

  1. 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)

NMOS

  1. 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)

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).

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).

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).

Resistors