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Reference source with gap

A reference and current technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of reference level error, large resistance thermal noise of output ports, errors, etc., to avoid errors and reduce thermal noise. Effect

Inactive Publication Date: 2009-03-04
FUDAN UNIV
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  • Application Information

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Problems solved by technology

Therefore, the mismatch of the controlled tube will produce errors, not only the absolute error of the reference level, but also the drift of the temperature coefficient, making the generated reference not stable enough
In addition, when the output mirror tube and the controlled tube have a 1:1 mirror image relationship—this is the ratio that people tend to adopt, the current of the output tube is equal to the current of a single controlled tube, that is, the total controlled current Therefore, a larger output resistance is required to generate a certain reference voltage, and thus a larger resistance thermal noise is generated at the output port

Method used

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Embodiment Construction

[0015] The electrical schematic diagram of the new bandgap reference source is shown in figure 1 As shown, the following two assumptions are made:

[0016] 1. The error amplifier A gain is large enough and the input has no offset, so the negative feedback makes the voltages at VA and VB points equal.

[0017] 2. The mismatch between the output tube M2 and the control tube M1 as well as the resistance mismatch can be ignored.

[0018] figure 1 In , the relationship between the current of a bipolar transistor and its emitter-base voltage is:

[0019] I Q = I S ( e qV EB / kT - 1 ) ≈ I S e qV EB ...

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Abstract

This invention belongs to integration circuit technique filed and to one new type of band gap basic reference source with low temperature parameters and low noise, wherein it comprises the electricity error amplifier, PMOS control tube, PMOS output tube, control resistance, output resistance and band gap current generation circuit; The band gap basic reference source can generate stable voltage and current with its core control part adopting one PMOS tube to avoid control tube disuse error.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and in particular relates to a novel bandgap reference source (Bandgap Reference) which provides low temperature coefficient reference voltage and reference current for analog circuits. Background technique [0002] Bandgap reference sources are usually important building blocks in analog and mixed-signal processing systems. They are used to provide high-stability reference levels and reference voltages, which play a vital role in system performance. With the development of semiconductor technology, more and more people integrate the bandgap reference source into the whole system instead of working as a discrete circuit or a single chip. However, in deep submicron technology, the mismatch of circuit components and circuit noise are the hindering factors of high-performance analog circuit design. Therefore, in the design of the bandgap reference source, how to reduce the impact of mismatc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/16
Inventor 詹陈长周晓方
Owner FUDAN UNIV