An adaptive reference circuit, chip and communication terminal with wide withstand voltage range

Abstract

The invention discloses an adaptive reference circuit in a wide voltage withstanding range, a chip and a communication terminal. The adaptive reference circuit comprises a bias circuit, a reference voltage generation circuit, a dynamic voltage divider control circuit and a dynamic voltage divider. The bias circuit provides bias current for the reference voltage generation circuit. The reference voltage generation circuit generates reference voltage by use of a resistor according to the bias current. The dynamic voltage divider control circuit is connected with the dynamic voltage divider and provides the bias voltage for the dynamic voltage divider. The voltage divider is arranged between a PMOS tube and an NMOS tube of the bias circuit. The bias voltage is changed along with the change of power supply voltage, so the voltage borne by the dynamic voltage divider is correspondingly changed, thereby ensuring that a transistor in an error amplifier works within a nominal voltage range.

Description

technical field [0001] The invention relates to a self-adaptive reference circuit with a wide withstand voltage range, as well as an integrated circuit chip using the self-adaptive reference circuit and a corresponding communication terminal, belonging to the technical field of integrated circuits. Background technique [0002] With the continuous development of integrated circuit technology, the corresponding chip size is getting smaller and smaller, and the withstand voltage level is getting lower and lower. However, in the power supply system of existing communication terminals, the power supply voltage is mostly maintained within a relatively wide range, which brings great challenges to low-voltage process devices used in high-voltage environments. When low-voltage process devices are directly connected to a high-voltage environment, it is easy to cause problems such as device breakdown and burnout, which seriously affect the normal operation of integrated circuit chips ...

AI Technical Summary

Problems solved by technology

The reference voltage generation circuit is generally directly connected to the power supply voltage. As the power supply voltage rises, the voltage difference between the transistor terminals will exceed the nominal withstand voltage value of its own process, and the device will face the danger of burning out.

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