US 11,940,823 B2
Reference voltage generation circuit
Seiichi Yamamoto, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Appl. No. 17/780,131
Filed by Rohm Co., Ltd., Kyoto (JP)
PCT Filed Nov. 27, 2020, PCT No. PCT/JP2020/044149
§ 371(c)(1), (2) Date May 26, 2022,
PCT Pub. No. WO2021/111994, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 2019-221241 (JP), filed on Dec. 6, 2019.
Prior Publication US 2022/0413528 A1, Dec. 29, 2022
Int. Cl. G05F 3/30 (2006.01); G05F 1/46 (2006.01); H02M 3/158 (2006.01)
CPC G05F 1/468 (2013.01) [H02M 3/158 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A reference voltage generation circuit, comprising:
a band gap reference circuit configured to generate a first reference voltage that depends on a band gap reference voltage and a supply voltage; and
a conversion circuit configured to convert the first reference voltage into a second reference voltage,
wherein:
the second reference voltage depends on the band gap reference voltage and a ground voltage,
the ground voltage is lower than the supply voltage,
the conversion circuit includes an amplifier,
an output terminal of the band gap reference circuit and a first input terminal of the amplifier are connected together with no resistive element therebetween, and
the conversion circuit further includes:
a first transistor between a first application terminal, to which the supply voltage is applied, and a second input terminal of the amplifier; and
a second transistor between the second input terminal of the amplifier and a second application terminal, to which the ground voltage is applied,
wherein:
a control terminal of the first transistor is connected to the first application terminal, and
the second reference voltage, or a division voltage of the second reference voltage, is fed to the control terminal of the second transistor.