KPI 用於 Analog Circuit Design

Analog circuit desing is not an art (or only partly is an art).

Majority day-to-day life is normal.  How come it is so difficult????

Because there is a big gap between device level and final result!!!

這是一個認知的間題

 

3 layers of knowledge in analog circuit

 

1. Device level

gm, rout, Cc

ft = gm/Cc;   gain = gm * rout

 

 

 

3. Result and 現象

Oscillator: oscillate or not and lock time, frequency detune

PLL: lock or not and lock time, spur, phase noise

ADC: ENOB, SNDR

 

Problem ==>

1. Need lot of simulation time: garbage in; garbage out!!

2. No physical insight!!!!

Because a big gap between device parameter and result/現象

 

Solution ==> Bridge the gap using KPI

What is KPI?

between device parameters and final results

only a few (2-4 parameters)

A clear coorelation between KPI and final results (best if there is a math formula)