Low noise cmos integrated reference voltage generation circuit
A technology for generating circuits and positive reference voltages, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc.
Inactive Publication Date: 2015-10-07
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Therefore, there is no reference voltage generation circuit that can be applied to MEMS acceleration sensors under the current CMOS process.
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[0017] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0018] figure 1 It is a low-noise CMOS integrated reference voltage generation circuit according to an embodiment of the present invention.
[0019] like figure 1 As shown, the low-noise CMOS integrated reference voltage generation circuit in this embodiment includes: a low-noise bandgap reference source generation circuit (BANDGAP), a startup circuit (START UP), a positive reference voltage generation circuit (LDOP) and a negative reference voltage generation circuit circuit (LDON).
[0020] The bandgap reference source generation circuit includes: a chopper amplifier CA1, an NMOS transistor M1, four resistors R1, R2A, R2B, R3 and two NPN type BJT transistors Q1, Q2. The connection relationship of each device is as follows: the drain of the NMOS transistor M1 is connected to the power supply VDD, the gate is connec...
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The invention relates to a low-noise CMOS integration reference voltage generation circuit. The low-noise CMOS integration reference voltage generation circuit comprises a low-noise band-gap reference source generation circuit, a positive reference voltage generation circuit and a negative reference voltage generation circuit. The low-noise band-gap reference source generation circuit comprises a chopping amplifier and is used for generating a low-noise band-gap reference source. The positive reference voltage generation circuit comprises a positive feedback circuit composed of a chopping amplifier, an MOS transistor and a resistor, and is used for generating a positive reference voltage from the low-noise band-gap reference source. The negative reference voltage generation circuit comprises a negative feedback circuit composed of a chopping amplifier, an MOS transistor, a current source and a resistor, and is used for generating a negative reference voltage symmetric with the positive reference voltage from the positive reference voltage. According to the low-noise CMOS integration reference voltage generation circuit, the CMOS technology is adopted and is compatible with the mainstream integrated circuit technology, and therefore cost can be lowered effectively. Moreover, the chopping technology is adopted in circuit layout so that a pair of reference voltages which are low in noise and good in symmetry can be generated.
Description
technical field [0001] The invention relates to the field of analog integrated circuit design, in particular to a low-noise CMOS integrated reference voltage generating circuit. Background technique [0002] The reference voltage circuit is a very important module in analog signal processing, and is widely used in various analog integrated circuits and analog / mixed signal integrated circuits, including data converters, switched capacitor circuits, microelectromechanical systems (MEMS) readout circuits, etc. Both require a stable reference voltage. The reference voltage circuit usually consists of a bandgap reference source and a low dropout voltage regulator, which can realize a stable reference voltage relative to process, voltage, and temperature. [0003] In fields such as high-precision data converters and precision measurements, one or several low-noise reference voltage sources are required. In particular, in high dynamic range MEMS accelerometers, the readout circui...
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IPC IPC(8): G05F1/56
Inventor 孙泉乔东海齐敏汤亮
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI