A low temperature coefficient reference current and voltage generating circuit

Abstract

The invention discloses a low temperature coefficient reference current and voltage generating circuit. The low temperature coefficient reference current and voltage generating circuit includes: a bootstrap current mirror, a first transistor, a second transistor and at least one third transistor; the bootstrap current mirror includes a control signal output terminal and a reference current output terminal; the first transistor The gate of the first transistor is connected to the control signal output terminal, the first pole of the first transistor is electrically connected to the first power supply line; the first pole of the second transistor is connected to the reference current output terminal, and the second pole of the second transistor is connected to the second power supply line; At least one third transistor is connected in series between the second pole of the first transistor and the first pole of the second transistor, the gates of each third transistor are electrically connected with the gates of the second transistor in turn, and the second pole of the first transistor The connection point with the third transistor serves as a reference voltage output terminal. The low temperature coefficient reference current and voltage generation circuit provided by the invention realizes the effects of little dependence on technology and 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 generating 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 used as the "criteria" of the whole 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 if figure 1 Taking the traditional bootstrap circuit shown as an example, this threshold voltage-based MOS transistor current generation circuit has been proven to be used as a reference current generatio...

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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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