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Integrator with wide output range and high precision

An integrator, high-precision technology, applied in the field of integrators, can solve problems such as mutual constraints, and achieve the effects of improving circuit performance, expanding output voltage range, and high precision

Pending Publication Date: 2020-07-17
上海微阱电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle of its existence is the same as Figure 1 The structure of the integrator shown is only at this time that the accuracy of the output voltage is closely related to the minimum voltage of the output in the reset state.

Method used

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  • Integrator with wide output range and high precision
  • Integrator with wide output range and high precision
  • Integrator with wide output range and high precision

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Embodiment Construction

[0029]In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] as attached Figure 4 And attached Image 6 As shown, a kind of integrator with wide output range and high precision provided by the present invention includes an integrating current source It, a first current source I1, a first switch S1, a reset switch S2, an operational amplifier OTA, a first resistor R1, and an integrating capacitor Ct and the load capacitance CL, wherein, the inverting input end of the operational amplifier OTA is simultaneously connected to one end of the first switch S1, one end of the integrating current source It, one end of the integrating capacitor Ct, one end of the reset switch S2, and the other end of the first switch S1 One end is connected to one end of the first current source I1, the...

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Abstract

The invention discloses an integrator with a wide output range and high precision. The inverting input end of an operational amplifier is connected with one end of a first switch, one end of an integrating current source, one end of an integrating capacitor and one end of a reset switch, the other end of the first switch is connected with one end of a first current source, the other end of the integrating capacitor is connected with the output end of the operational amplifier, the other end of the reset switch is connected with one end of the first resistor, the other end of the first resistoris connected with the output end of the operational amplifier, and the non-inverting input end of the operational amplifier is connected with a reference signal VCM; the current directions of the integral current source and the first current source are opposite, and the current value output by the first current source is larger than that output by the integral current source. The output voltage of the integrator in the reset state can be flexibly set, the operational amplifier structure can be flexibly adopted to improve the performance of the whole circuit, and the performance of the integral current source generation circuit can be improved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an integrator with wide output range and high precision. Background technique [0002] The function of the integrator is to output a voltage signal that changes with time by integrating the current to charge and discharge the capacitor during the integration phase. Integrators are widely used in analog circuit chips, such as integral analog-to-digital converter (ADC) circuits and Sigma_Delta analog-to-digital converter circuits. Integrating ADCs are widely used in current CMOS image sensor chips because of their simple structure, high precision, and ease of multi-column ADC parallel processing. Therefore, integrators are also widely used in CMOS image sensor chips. [0003] In CIS (CMOS Image Sensor, CMOS image sensor), it is usually necessary to convert the light signal into a voltage signal in the photosensitive unit (pixel) and then connect the PGA (Programmable Gain Amplif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12H03F1/42H03F3/45
CPCH03M1/1245H03F1/42H03F3/45179
Inventor 何学红
Owner 上海微阱电子科技有限公司
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