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Startup circuit and bandgap reference source circuit with startup circuit

A reference source circuit and start-up circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as the influence of the conduction voltage drop bandgap reference source circuit 10, so as to ensure normal operation and improve versatility Effect

Active Publication Date: 2013-11-13
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 2 Although the start-up circuit 20 shown can turn off the leakage of the bandgap reference source circuit 10, the conduction voltage drop of the switch tubes M5' and M6' has an impact on the bandgap reference source circuit 10, therefore, two The switching tubes M5' and M6' have good matching performance with bipolar transistors Q0 and Q1 branches

Method used

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  • Startup circuit and bandgap reference source circuit with startup circuit
  • Startup circuit and bandgap reference source circuit with startup circuit
  • Startup circuit and bandgap reference source circuit with startup circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0038] see image 3 , is a circuit diagram of Embodiment 1 of the bandgap reference source circuit including the start-up circuit of the present invention, the start-up circuit 200 is used to control the bandgap reference source circuit 100 to quickly enter the required working state after the circuit is started.

[0039] bandgap reference source circuit 100 with figure 1 The bandgap reference source circuit shown in is the same, including: PMOS transistors M5 and M6, operational amplifier A, bipolar transistor Q0 and Q1 resistor R0. Among them, the negative feedback circuit composed of PMOS transistors M5 and M6 and the operational amplifier A, the sources of the PMOS transistors M5 and M6 are connected to the voltage VCC, the drain of the PMOS transistor M5 and the emitter of the bipolar transistor Q0 are connected to the operational amplifier A The drain of the PMOS transistor M6 is connected to the non-inverting input of the operational amplifier A; the emitter of the bip...

Embodiment 2

[0046] On the basis of Embodiment 1, a capacitive element can be added in the starting circuit, see Figure 4 , is the circuit diagram of Embodiment 2 of the bandgap reference source circuit including the start-up circuit of the present invention, the start-up circuit 201 is used to control the bandgap reference source circuit 100 to quickly enter the required working state after the circuit is started.

[0047] The start-up circuit 201 includes: three PMOS transistors, three NMOS transistors and a switch transistor, specifically the first PMOS transistor M7, the second PMOS transistor M0 and the third PMOS transistor M1, the first NMOS transistor M2, and the second NMOS transistor M3 and a third NMOS transistor M4, a switch transistor M8 and a capacitive element C0. Except for the capacitive element, other elements in the startup circuit 201 are the same as those in the startup circuit 200 in Embodiment 1, and will not be described here. The capacitive element is connected b...

Embodiment 3

[0052] In the bandgap reference source circuit including the start-up circuit of the present invention, the switch tube may use bipolar transistors, such as NPN or PNP transistors.

[0053] see Figure 6 , in the bandgap reference source circuit including the start-up circuit in this embodiment, the start-up circuit 203 includes: three PMOS transistors, three NMOS transistors and a PNP transistor as a switch, specifically the first PMOS transistor M7, the second The PMOS transistor M0 and the third PMOS transistor M1, the first NMOS transistor M2, the second NMOS transistor M3 and the third NMOS transistor M4, and a PNP transistor M10 (switching transistor). Except for the PNP transistor M10 as a switch tube, other components in the start-up circuit 203 are the same as those in the start-up circuit 200 in Embodiment 1, and will not be repeated here. Wherein, the emitter of the PNP transistor M10 is connected to the gate of the second NMOS transistor M3, the collector is conne...

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PUM

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Abstract

The invention provides a startup circuit of a bandgap reference source circuit. The bandgap reference source circuit comprises a negative feedback circuit and two bipolar transistors, the negative feedback circuit consists of an operational amplifier and two PMOS (P-channel Metal Oxide Semiconductor) tubes, the startup circuit comprises a switch tube, one end of the switch tube is connected with one input end of the operational amplifier of the bandgap reference source circuit, and the switch tube is controlled to be connected and closed according to the level of powerdown control signal. When the bandgap reference source circuit is shut off, the switch tube is closed; and when the bandgap reference source circuit is started, the switch tube is connected. Correspondingly, the invention also provides the bandgap reference source circuit with the startup circuit. The switch tube can be connected or closed according to the level of the control signals, the bandgap reference source circuit can be completely shut off by the startup circuit when power down control signals are of high level, normal operation of the startup circuit can be guaranteed, and the power consumption of the startup circuit is very low.

Description

technical field [0001] The invention relates to the field of bandgap reference source circuits, in particular to a start-up circuit and a bandgap reference source circuit including the start-up circuit. Background technique [0002] In recent years, due to the rapid development of integrated circuits, bandgap reference sources have been widely used in analog integrated circuits, digital-analog hybrid circuits, and system integrated chips. For the circuit diagram of the bandgap reference circuit, see figure 1 , the bandgap reference source circuit 10 includes a negative feedback circuit composed of an operational amplifier A and two PMOS transistors M5 and M6, the negative feedback circuit pairs two bipolar transistors Q0 and Q1 with positive temperature coefficient and negative temperature coefficient The voltage of the branch is negatively fed back, and the branch of the bipolar transistor Q1 includes a resistor R0 connected in series with the bipolar transistor Q1. By de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 潘少辉胡胜发
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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