Bandgap reference starting circuit and method for wide power supply range based on radiation-resistant bipolar technology

Abstract

The invention provides a band gap reference starting circuit and method based on a radiation resistance double-pole technology and used for a wide power source range. It is ensured that when power supply is low, normal work of the band gap reference circuit is not influenced, and the circuit is applied to the wide power source range. The circuit comprises the band gap reference circuit and a starting circuit body which are connected; the starting circuit body is composed of a Zener diode D1, a resistor R1, a first double-pole transistor set and a second double-pole transistor set. By means ofthe starting method, the difference of breakdown voltage BV of the Zener diode D1 and junction voltage of triodes Q1, Q4 and Q16 can generate current irrelevant to power source voltage and with a certain temperature coefficient on resistors R2 and R3. As to the circuit, through R6, a triode Q6 and a triode Q7, compensation current with the temperature coefficient opposite to that of the current isgenerated, and after the two pieces of current flow through a triode Q13, reference current with temperature compensation properties is finally formed, then flows out of a collector of a pipe 15 through the mirror image effect of a triode Q14 and is provided for other circuit modules.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a bandgap reference starting circuit and method for a wide power supply range based on an anti-radiation bipolar process. Background technique [0002] The bandgap reference circuit is an essential component module in an analog integrated circuit chip, and is generally used to generate a stable reference voltage that does not vary with power supply voltage, temperature and process. The bandgap reference circuit usually has two stable states, but one of the stable states with zero current cannot make the circuit work normally. Therefore, the startup circuit technology is often used to force the reference circuit to get rid of this non-ideal state, so that the circuit flows through A certain current starts to work normally. [0003] Such as figure 1 As shown, a starting circuit structure used in a circuit is disclosed in the prior art. For the convenience of de...

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Problems solved by technology

[0008] Due to the limitations of the existing domestic anti-radiation bipolar technology level, the breakdown voltage of the diode cannot reach the level of foreign technology manufacturing when the power supply voltage is low, and the low power supply voltage and high diode breakdown voltage will cause the Q5 tube Entering the saturation region, it seriously affects the performance of the reference circuit, so the startup circuit of this structure cannot be used on the domestic process line, which greatly limits its application range and circuit reliability

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