Patent ID: 11966245
Assignee: FOCALTECH ELECTRONICS (SHENZHEN) CO., LTD.
Field: Control (Instruments)
Classification: CPC G  H | IPC G

Claim 0:
1. A voltage reference source circuit, configured to generate a reference voltage comprising a starting circuit, a current generating circuit and an output voltage reference circuit electrically connected in sequence, wherein
the starting circuit provides a starting voltage for the voltage reference source circuit to prevent the voltage reference source circuit from operating in a zero state area;
the current generating circuit generates a working current for the output voltage reference circuit; and
the output voltage reference circuit realizes the reference voltage output with zero temperature coefficient according to the working current output by the current generating circuit;
wherein the starting circuit comprises a first PMOS tube, a first NMOS tube, and a second NMOS tube, a source of the first PMOS tube is connected to a first power source, and a gate of the first PMOS tube is grounded, a drain of the first PMOS tube is connected to the gate of the first NMOS tube, and a drain and a source of the first NMOS tube lead out a first start signal output terminal and a second start signal output terminal respectively, to provide a start signal to the current generating circuit, and a drain of the second NMOS tube is connected to the gate of the first NMOS tube, a source of the second NMOS tube is grounded, and the source of the second NMOS tube is also connected to the source of the first NMOS tube, and a gate of the second NMOS tube is connected to a reference voltage output terminal,
the first PMOS tube is an inverted tube,
when the first power source is powered on, the reference voltage output terminal is at low level, the first NMOS tube is turned on to activate the output voltage reference circuit, when the reference voltage of the reference voltage output terminal rises, the second NMOS tube is turned on, the first NMOS tube is turned off.