Multipath reference voltage multiplexing circuit
A technology of multiplexing circuits and reference voltages, which is applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., to achieve the effect of eliminating noise, preventing noise from refilling, and improving anti-noise performance.
Pending Publication Date: 2022-04-08
苏州飞域微电子有限公司
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Problems solved by technology
[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a multi-channel reference voltage multiplexing circuit, which is used to solve the problem of the noise generated by the sub-module circuit feeding back into the reference voltage source in the prior art
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[0028] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0029] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...
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The invention provides a multi-path reference voltage multiplexing circuit which comprises a voltage and current conversion module, a current single-path to multi-path conversion module and a current to voltage conversion module, and the input end of the voltage and current conversion module is connected with the output end of a reference voltage source. The output end of the voltage and current conversion module is connected with the input end of the current single-path-to-multi-path module, the output end of the current single-path-to-multi-path module is connected with the input end of the current-to-voltage module, and the output end of the current-to-voltage module is connected with the input end of each branch circuit; compared with the prior art, the reference voltage source has the advantages that voltage signals output by the reference voltage source can be converted into current signals through the operational amplifier and the field-effect tube, then the current signals are subjected to multi-path mirroring through the current mirror circuit, multi-path current signals are formed, and due to the fact that the current mirror circuit has high output impedance, the output impedance of the current mirror circuit is greatly improved. And the high output impedance has better anti-noise performance and noise recharge prevention performance.
Description
technical field [0001] The invention relates to the technical field of reference voltage sources, in particular to a multi-channel reference voltage multiplexing circuit. Background technique [0002] Numerical control reference voltage source is an extremely important part of contemporary analog integrated circuits. It provides reference voltage for series voltage regulator circuits, A / D and D / A converters, and is also the regulated power supply or excitation source for most sensors. Voltage sources can also be used as standard batteries, calibration standards for instrument heads, and precision current sources. Voltage references can be found in almost all advanced electronic products. They may be independent or integrated in devices with more functions middle. [0003] When the reference voltage source needs to be shared in many sub-module circuits, due to the different characteristics of each sub-module circuit, different noise will be generated. If the reference voltag...
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IPC IPC(8): G05F1/56
Inventor 徐静田荣军朱启举张鹏张力锋石川
Owner 苏州飞域微电子有限公司