Bandgap Reference Design

A simple bandgap topology is evaluated with a set of simulations and then implemented in open-source EDA tools. Please refer to this git repo for detailed information on the design (https://github.com/vsdip/avsdbgp_3v3_sky130_v1).

Bandgap Performance Characteristics

Parameter	Description	Min	Type	Max	Unit	Condition
Technology	130 nm CMOS Process
RL	Load resistance at Vbgp terminal	100			Mohm	VDD=3.3V, T=27C
Vbgp	Output Reference voltage	1.197642	1.201057	1.212476	V	T=-40 to 140C, VDD=3.3V
Vbgp	Output Reference voltage	1.178285	1.201057	1.211677	V	VDD=2.7V to VDD=3.6V, T=27C
TC_vbgp	Temperature Coefficient of Vbgp		6.8717		ppm/C	T=-40 to 140C, VDD=3.3V
VC_vbgp	Voltage Coefficient of Vbgp		2.7802		%/V	VDD=2.7V to 3.6, T=27C
VDD	Supply Voltage	3.2	3.3	3.6	V	T=-40C to 140C
IDD	Supply Current		3.954		uA	EN=1
IDD	Supply Current		607.836		nA	EN=0

Here are some reference links used to learn to design in open source EDA tools and about bandgap reference circuit design.

1. https://github.com/nickson-jose/vsdstdcelldesign

2. https://github.com/praharshapm/vsdmixedsignalflow

3. https://github.com/sherylcorina/avsdbgp_3v3

4. https://github.com/an3ol/General-purpose-Bandgap-Reference-avsdbgp_3v3

5. https://www.udemy.com/course/vlsi-academy-custom-layout/

Acknowledgement

• Kunal Ghosh - Co-founder (VSD Corp. Pvt. Ltd)
• Tim Edwards - Senior Vice President of Analog and Design at efabless corporation
• Anmol Purty - VSD Intern
• Sheryl Serrao - VSD Intern