Bipolar complementary metal oxide semiconductor (BiCMOS) current-type reference circuit

Abstract

The invention discloses a bipolar complementary metal oxide semiconductor (BiCMOS) current-type reference circuit. The BiCMOS current-type reference circuit comprises a reference nuclear circuit, a starting circuit and a reference current output circuit, wherein the reference nuclear circuit consists of three parts, namely a current mirror circuit, a positive temperature coefficient current generating circuit and a negative temperature coefficient current generating circuit; the current mirror circuit is used for generating a matched branch circuit, and a reference current which is obtained by adding a positive temperature coefficient current to a negative temperature coefficient current according to a certain proportion and has the temperature coefficient of zero at the normal temperature; the starting circuit is used for starting the reference nuclear circuit when the power is turned on; and the reference current output circuit is used for outputting the reference current generated by the reference nuclear circuit according to a proportion. Compared with the conventional voltage-type reference circuit, the BiCMOS current-type reference circuit has the advantages that the BiCMOS current-type reference circuit is not influenced by power supply network direct-current voltage drop, the transmission loss is low, the matching performance is high, the temperature stability is high, the occupied area of a chip is small, the circuit is self-started when the power is turned on and the like because of the adoption of a current transmission method, and is particularly suitable for the places with very stringent requirement of an analogue-to-digital / digital-to-analogue converter on reference signals.

Description

technical field [0001] The invention relates to the field of analog or digital-analog hybrid integrated circuit reference generation, in particular to a current-type reference generation circuit. Background technique [0002] The circuit structure of the traditional reference circuit is generally more complicated, and the generated reference signal is unstable, and even there are certain problems in the circuit start-up, etc., and it is often difficult to be competent in occasions with high requirements for the reference signal. The specific analysis is as follows: [0003] attached figure 1 Generate circuits for traditional voltage-type references. The circuit includes bipolar transistors 111 and 112 , resistors 113 , 114 and 115 , and operational amplifier 110 . The output terminal VOUT of the operational amplifier generates a reference voltage. [0004] Since the resistors 113, 114, 115 and the operational amplifier 110 form a feedback network, the voltages at the two ...

AI Technical Summary

Problems solved by technology

The invention solves the problems of the traditional reference circuit in terms of circuit complexity, generated reference signal instability, circuit start-up, etc.

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