A reference voltage source startup circuit

Abstract

The invention discloses a starting circuit of a reference voltage source. The starting circuit of the reference voltage source comprises a first transistor VT1, a second transistor VT2, a third transistor VT3, a fourth transistor VT4 and a fifth transistor VT5. The third transistor VT3 and the fourth transistor VT4 constitute a common collector amplification circuit, the output voltage VERF of the reference voltage source is connected into the base electrode of the fourth transistor VT4 to be used as the input of the common collector amplification circuit, the output end of the common collector amplification circuit controls the fifth transistor VT5 to charge and discharge internal nodes of the reference voltage source, and therefore a negative feedback circuit for the output voltage VERF of the reference voltage source is formed. By means of the starting circuit of the reference voltage source, the output voltage overshoot peak happening to a power source circuit in the electrical starting process can be eliminated, the output voltage can rise smoothly and steadily, the quiescent operating point of the reference voltage source is stabilized, the starting speed is increased, and the improved effect is obvious especially on a low power consumption band-gap reference voltage source. The structure is simple, implementation is easy, and the cost is low.

Description

technical field [0001] The invention relates to a starting circuit of a reference voltage source. technical background [0002] The reference voltage source is a common circuit in integrated circuits, which is used to generate a reference voltage that does not change with the power supply voltage or temperature. This voltage can provide accurate reference voltages for other modules in the integrated circuit system. The reference voltage source plays an important role in the integrated circuit system, and its accuracy and speed greatly affect the performance of the system circuit. [0003] With the rapid development of the mobile device market, various mobile terminals require chips with lower and lower power consumption, and the static power consumption of many chips is reduced to below 10 microamperes. As an important module in the chip, the allowable power consumption allocated to the reference voltage source is getting lower and lower, and the power consumption limitatio...

AI Technical Summary

Problems solved by technology

As an important module in the chip, the allowable power consumption allocated to the reference voltage source is getting lower and lower, and the power consumption limitation brings great challenges to the design of the reference voltage source

Due to the limitation of power consumption, it usually takes a long time for the output voltage of the reference voltage source to enter the equilibrium state, and a higher supply voltage is required to reach the equilibrium state

Therefore, when the power supply voltage is powered on, this reference voltage source will have a large spike and take a long time to stabilize

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