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Current mode sigma-delta modulator and method of operation thereof, analog-to-digital converter and solid-state imaging device

A current mode, modulator technology, applied in analog conversion, code conversion, TV and other directions, can solve the problem that the modulator cannot work normally

Active Publication Date: 2022-03-18
SONY SEMICON SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of modulator does not work properly because once the external driver 341 is connected, the input current on capacitor 331 can be removed

Method used

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  • Current mode sigma-delta modulator and method of operation thereof, analog-to-digital converter and solid-state imaging device
  • Current mode sigma-delta modulator and method of operation thereof, analog-to-digital converter and solid-state imaging device
  • Current mode sigma-delta modulator and method of operation thereof, analog-to-digital converter and solid-state imaging device

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Embodiment Construction

[0027] Before describing any embodiments of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and arrangement of the components set forth in the following description or shown in the following drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways.

[0028] For example, although the following description is provided using an example implemented using an image sensor and an imaging device, the present invention is not limited thereto. A current mode sigma-delta modulator according to the present invention may be used in any implementation that performs analog-to-digital conversion, including but not limited to audio sensor circuits, autonomous vehicles, industrial sensing systems, and the like.

[0029]

[0030] Figure 4 A current mode sigma-delta modulator 400 is shown that does not require a reference current source or an external driver...

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PUM

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Abstract

The present invention relates to a current-mode Σ-Δ modulator, an operating method thereof, an analog-to-digital converter and a solid-state imaging device including the current-mode Σ-Δ modulator. The current mode Σ-Δ modulator includes: an input node; a comparator that compares a voltage of the input node with a reference voltage and outputs a comparison result; an integrating capacitor connected to an input of the comparator; and a switch A capacitor circuit connected at a first terminal to the input node, the input of the comparator, and the integrating capacitor and at a second terminal to the output of the comparator. The current mode Σ-Δ modulator is a component of an analog-to-digital converter. The current mode Σ-Δ modulator according to the invention is robust to clock jitter.

Description

technical field [0001] The present invention relates to analog-to-digital conversion. More specifically, the present invention relates to systems and methods for providing efficient analog-to-digital conversion using current mode sigma-delta (sigma-delta) modulators. Background technique [0002] In digital image or video capture systems, image sensors are used to convert light energy into electrical signals so that digital representations can be obtained. A digital image sensor in such systems typically includes a pixel array, a set of sample-and-hold (SH) circuits, a set of analog-to-digital converters (ADC), readout circuits, timing circuits, and control circuits. [0003] Depending on the application, various types of ADCs can be used in image sensors. These ADCs include single-step conversion (flash) ADCs, single-slope ADCs, successive approximation ADCs, pipelined ADCs, sigma-delta ADCs (also known as delta-sigma ADCs), and the like. Sigma-delta ADCs are often used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M3/00
CPCH03M3/464H03M3/372H03M3/43H03M3/454H03M3/456H03M3/45H04N25/78H04N23/54H04N25/75H03M3/462H03M3/486H03M3/496
Inventor 瓦丹·特卡乔夫
Owner SONY SEMICON SOLUTIONS CORP