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Switched capacitor type single-end-to-differential circuit

A single-ended to differential, switched capacitor technology, applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, etc., can solve problems such as non-adjustable, to eliminate offset voltage, filter out low-frequency noise Effect

Pending Publication Date: 2020-12-08
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously its output common mode voltage is a fixed value and cannot be adjusted

Method used

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  • Switched capacitor type single-end-to-differential circuit
  • Switched capacitor type single-end-to-differential circuit
  • Switched capacitor type single-end-to-differential circuit

Examples

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Embodiment Construction

[0022] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0023] Embodiments of the present invention relate to a switched capacitor type single-ended to differential circuit, such as figure 1 As shown, it includes the input terminal, the differential high-level conversion circuit, the differential low-level conversion circuit, the first output terminal Vo + and the second output terminal Vo - , the input end is connected to the input end of the differential high level conversion c...

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Abstract

The invention relates to a switched capacitor type single-end-to-differential circuit, which comprises a differential high-level conversion circuit and a differential low-level conversion circuit, andis characterized in that the differential high-level conversion circuit is used for converting a voltage signal with the input amplitude of Vin into a voltage signal with the amplitude of Vref + Vinand outputting the voltage signal with the amplitude of Vref + Vin; filtering low-frequency noise mixed in the input signal in a clock period; the differential low-level conversion circuit is used forconverting a voltage signal with the input amplitude being Vin into a signal with the amplitude being VrefVin to be output, and filtering out low-frequency noise mixed in the input signal within oneclock period. The offset voltage of the operational amplifier can be eliminated while the voltage is converted.

Description

technical field [0001] The invention relates to a single-end to differential circuit, in particular to a switched capacitor type single-end to differential circuit. Background technique [0002] The fully differential circuit utilizes the symmetry of circuit parameters to amplify differential signals and suppress common-mode signals. The differential signal can effectively suppress the even-order harmonics of the system through subtraction, so high-performance circuits mostly adopt the form of fully differential circuits. And because the fully differential circuit usually has a higher gain bandwidth and a larger output swing, it has a wide range of applications in AD / DA converters, active filters, sample-and-hold circuits, and interface circuits. [0003] The single-ended to differential circuit is used as an interface circuit. On the one hand, it must be able to realize signal conversion. At the same time, because the KTC noise, offset noise, and flicker noise of the circu...

Claims

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Application Information

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IPC IPC(8): H03K19/0185
CPCH03K19/0185
Inventor 汪明亮袁晓兵汤耀云张欣轶李宝清
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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