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Reference voltage source

A reference voltage source, reference technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., to achieve the effects of improving accuracy, reducing circuit noise, and improving power supply rejection ratio

Inactive Publication Date: 2013-11-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a reference voltage source for the above-mentioned problems of the traditional bandgap reference voltage source

Method used

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Examples

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Embodiment

[0027] This example is a specific implementation made according to the above principles of the present invention. figure 2 On the basis of this, all the switches are implemented with NMOSFETs, the specific circuit is as image 3 As shown, the input bias and startup circuit includes a first PMOS transistor P1, a second PMOS transistor P2, a third PMOS transistor P3, a fourth PMOS transistor P4, a first NMOS transistor N1, a twelfth NMOS transistor N12, a The thirteenth NMOS transistor N13, the fourteenth NMOS transistor N14, the fifteenth NMOS transistor N15, and the sixteenth NMOS transistor N16, the switched capacitor circuit includes a second NMOS transistor N2, a third NMOS transistor N3, and a fourth NMOS transistor N4 , fifth NMOS transistor N5, sixth NMOS transistor N6, seventh NMOS transistor N7, eighth NMOS transistor N8, ninth NMOS transistor N9, tenth NMOS transistor N10, eleventh NMOS transistor N11, first logic control signal SW1 , the second logic control signal...

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Abstract

The invention relates to an analog integrated circuit technology, in particular to a reference voltage source. The reference voltage source is characterized by comprising an input bias and starting circuit, a switch capacitive circuit and an operational amplifier and reference generating circuit. The input bias and starting circuit is connected with the switch capacitive circuit, and the switch capacitive circuit is connected with the operational amplifier and reference generating circuit. The reference voltage source has the advantages that the influences of transistor mismatch and resistance bias on the accuracy of the reference voltage are avoided, a switch capacitive technology is utilized, a reference voltage source circuit is completely composed of MOSFETs, large resistors and parasitic bipolar transistors are avoided, therefore, the accuracy of the reference voltage is improved, the layout area is decreased, circuit noise is reduced, the output reference voltage can be adjusted according to actual requirements, and the reference voltage source is suitable for the standard CMOS process. The reference voltage source is especially suitable for the fields of reference voltage sources.

Description

technical field [0001] The invention relates to analog integrated circuit technology, in particular to a reference voltage source. Background technique [0002] Reference voltage source, as a basic modular unit, is used in analog circuit design, mixed signal circuit design and digital design. Reference voltage sources are essential circuit units in bias circuits, A / D, D / A conversion, voltage adjustment circuits, DRAMs, and flash memory. The most important characteristic of the reference voltage source is that its output voltage is insensitive to changes in temperature and power supply voltage. The two parameters of temperature coefficient (TC, Temperature Coefficient) and power supply rejection ratio (PSRR, Power Supply Rejection Ratio) determine a reference The performance of the voltage source is good or bad. [0003] Traditional bandgap voltage references such as figure 1 As shown, it includes PMOS current mirrors M1, M2, M3, operational amplifier OP, resistors R1, R2,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 方健彭宜建王贺龙谷洪波贾姚瑶程春云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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