Band gap reference circuit and double-output self-reference voltage stabilizer thereof

Abstract

The invention discloses a band gap reference circuit. The band gap reference circuit comprises a double-output self-reference voltage stabilizer and a reference generating circuit. The double-output self-reference voltage stabilizer comprises a self-bias transconductance operation amplifier and a feedback voltage amplifier, wherein the self-bias transconductance operation amplifier is used for generating a first positive temperature coefficient current through the area difference of bipolar junction transistors of an input pair to bias the input pair and generating a positive temperature coefficient control voltage and a negative temperature coefficient control voltage; the feedback voltage amplifier is used for amplifying the negative temperature coefficient control voltage and outputting a reference voltage to feed back to the input pair for generating a first negative temperature coefficient current. The band gap reference circuit is used for generating a total voltage and a total current according to the positive temperature coefficient control voltage and the negative temperature coefficient control voltage.

Description

technical field [0001] The invention relates to a bandgap reference circuit and a dual-output self-reference voltage stabilizer thereof, in particular to a bandgap reference circuit with low system voltage and low layout area and a dual-output self-reference voltage stabilizer thereof. Background technique [0002] With the development of today's digital products, a large number of applications of handheld devices have emerged. Such products use a lower system voltage to reduce power consumption. If the circuit in this application needs to generate a reference voltage that does not change with temperature, it is necessary to use a power supply that can be suitable for low system voltage operation and provide a low reference voltage at the same time. Bandgap Reference Circuit. [0003] For example, please refer to figure 1 , figure 1 It is a schematic diagram of a bandgap reference circuit 10 in the prior art. Such as figure 1 As shown, in the energy bandgap reference ci...

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Problems solved by technology

However, although the structure of the bandgap reference circuit 30 can use the current mirror method to remove the tail current source in the transconductance operational amplifier, the minimum required system voltage VDD is reduced by a voltage V DS =0.2V, but still need to lock the input voltage V using the transconductance op amp 200 IN+ with V IN- , and with resistor R 1 ', R 2 'Balance resistor R 1 , R 2 current, so it still has the disadvantages of the bandgap reference circuit 10 architecture

[0021] From the above, it can be known that the known bandgap reference circuit for low system voltage operation uses the known transconductance operational amplifier architecture to lock the voltage to generate a positive temperature coefficient current, and needs to balance the circuit that generates a negative temperature coefficient current with an additional resistor, so the circuit more complicated structure

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