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1. (WO2018121917) BANDGAP REFERENCE CIRCUIT AND METHOD FOR PROVIDING A REFERENCE VOLTAGE

Pub. No.:    WO/2018/121917    International Application No.:    PCT/EP2017/079661
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Sat Nov 18 00:59:59 CET 2017
IPC: G05F 3/30
H04R 1/04
H04R 1/06
Applicants: TDK ELECTRONICS AG
Inventors: ZOU, Lei
ROCCA, Gino
Title: BANDGAP REFERENCE CIRCUIT AND METHOD FOR PROVIDING A REFERENCE VOLTAGE
Abstract:
The bandgap reference circuit (BG) comprises a voltage generator (BC), a supply circuit (SC) and a control loop. The voltage generator (BC) comprises a first and a second branch and is configured to produce a reference voltage (vref) with a temperature coefficient lower than a given threshold. The supply circuit (SC) is configured to provide a first current to the first branch and a second current to the second branch of the voltage generator (BC). The control loop comprises a transconductance amplifier (OTA) configured and arranged to provide an output signal representative of a difference between a first voltage of the first branch and a second voltage of the second branch. Furthermore, the control loop comprises a filter coupled with an output of the transconductance amplifier (OTA). The filter provides an output signal controlling the provided first current and second current of the current source.