US 12,278,604 B2
Voltage follower circuit
Kosuke Takada, Nagano (JP)
Assigned to ABLIC Inc., Nagano (JP)
Filed by ABLIC Inc., Nagano (JP)
Filed on Sep. 12, 2023, as Appl. No. 18/465,169.
Claims priority of application No. 2022-172250 (JP), filed on Oct. 27, 2022.
Prior Publication US 2024/0146299 A1, May 2, 2024
Int. Cl. H03F 3/50 (2006.01); H03F 3/30 (2006.01); H03F 3/347 (2006.01)
CPC H03F 3/505 (2013.01) [H03F 3/3011 (2013.01); H03F 3/347 (2013.01); H03F 2203/5027 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A voltage follower circuit, comprising:
a first power supply terminal;
a second power supply terminal;
an input port;
an output port;
a first MOS transistor, having a source connected to the input port;
a second MOS transistor, having a source connected to the output port and having a gate and a drain connected to a gate of the first MOS transistor;
a first constant current source, connected between a drain of the first MOS transistor and the second power supply terminal;
a second constant current source, connected between the drain of the second MOS transistor and the second power supply terminal; and
a depletion type third MOS transistor, having a gate connected to the drain of the first MOS transistor, having a drain connected to the first power supply terminal, and having a source connected to the output port.