Band-gap reference circuit suitable for radio-frequency circuit

Abstract

The invention relates to a band-gap reference circuit, in particular to a band-gap reference circuit suitable for a radio-frequency circuit, and belongs to the technical field of band-gap reference circuits. According to the technical scheme, the band-gap reference circuit suitable for the radio-frequency circuit comprises a self-starting circuit for being connected with a power supply Vdd and a reference circuit connected with the self-starting circuit, and the reference circuit is connected with a buffer load output circuit. After the self-starting circuit is powered on and started, the self-starting circuit can charge the reference circuit; after a voltage in the reference circuit is stabilized, the self-starting circuit is open, the reference circuit can generate an output current Iref irrelevant with temperature, and the buffer load output circuit outputs a voltage stable in strength and range of oscillation according to the output current Iref. The band-gap reference circuit is compact in structure, small in temperature drift coefficient and low in noise, can provide constant low-noise voltage and current for a radio frequency system and is safe and reliable.

Description

technical field [0001] The invention relates to a bandgap reference circuit, in particular to a bandgap reference circuit suitable for radio frequency circuits, belonging to the technical field of bandgap reference circuits. Background technique [0002] With the development of the Internet of Things and the advent of the era of big data, technologies such as wireless mobile communication, wireless data transmission and global positioning have gradually improved and matured. Miniaturized, low-power, low-cost, high-performance communication transmission equipment has become more and more popular among people. The importance of radio frequency integrated circuits (RFICs) has been widely used in short-distance communications such as mobile communications, satellite communications and global positioning systems, wireless local area networks, Bluetooth and ZigBee. The operating frequency of radio frequency circuits is usually very high, so higher requirements are placed on the st...

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Problems solved by technology

[0003] The frequency of the radio frequency circuit is very high, the parasitic effect is difficult to ignore, the chip manufacturing process is getting more and more advanced, the power supply voltage is also becoming very low, and there are fewer and fewer devices available from the power supply to the ground. As simple as possible, this poses a challenge for bandgap reference circuits

The temperature drift coefficient of the traditional first-order temperature compensation structure of the bandgap reference is about tens of ppm, which cannot meet the needs of radio frequency circuits; in order to ensure a low temperature drift coefficient, the second-order temperature compensation structure is adopted, the number of devices increases, and the temperature drift coefficient decreases while increasing large parasitic effects, seriously affecting the performance of the circuit

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