Low temperature coefficient reference current and voltage generation circuit

Abstract

The invention discloses a low temperature coefficient reference current and voltage generation circuit. The low temperature coefficient reference current and voltage generation circuit comprises a bootstrap current mirror, a first transistor, a second transistor and at least one third transistor. The bootstrap current mirror comprises a control signal output end and a reference current output end; the gate of the first transistor is connected with the control signal output end, and the first pole of the first transistor is electrically connected with a first power line; a first electrode of the second transistor is connected with the reference current output end; a second electrode of the second transistor is connected with a second power line; and at least one third transistor is connected in series between the second electrode of the first transistor and the first electrode of the second transistor, the gate of each third transistor is electrically connected with the gate of the second transistor in sequence, and the connection point of the second electrode of the first transistor and the third transistor serves as a reference voltage output end. The low temperature coefficient reference current and voltage generation circuit provided by the invention realizes the effects of low process dependence and a low temperature coefficient.

Description

technical field [0001] Embodiments of the present invention relate to analog integrated circuit technology, and in particular to a low temperature coefficient reference current and voltage generation circuit. Background technique [0002] The reference current generation circuit is an important part of analog and mixed-signal integrated circuits, and it is widely used in low-dropout linear regulators, temperature sensors, data converters, radio frequency transceivers, Flash memory and other circuits. [0003] The reference current generation circuit is the "guideline" of the entire integrated circuit, and its performance directly affects the performance of the circuit. Therefore, the reference current generation circuit should have good anti-interference ability. as figure 1 Taking the traditional bootstrap circuit shown as an example, this threshold voltage-based MOS tube current generation circuit has been proven to be used as a reference current generation circuit, and c...

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Problems solved by technology

another example image 3 The simple reference voltage generation circuit shown can generate reference voltages for various integrated circuits, but the realization of the above circuit functions largely depends on the process parameters, and the generated reference current and voltage have large temperature coefficients, which cannot be used as high Reference current and reference voltage usage for performance analog circuits

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