Two-step single-slope ADC circuit based on TDC, conversion method and application

CN120263188APending Publication Date: 2025-07-04KUNMING INST OF PHYSICS
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Patent Information

Application Number
CN202510333800.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-20
Publication Date
2025-07-04

AI Technical Summary

Technical Problem

In the prior art, single-step single-slope ADCs face high-frequency clock transmission problems in image sensors, resulting in high power consumption and impact on imaging quality, and two-step coarse fine clock frequency matching is difficult to achieve.

Method used

A two-step single-slope ADC circuit based on TDC is adopted, and a local ring oscillator is used to generate a precision quantization clock. Combined with the N-bit mapping module to reduce the frequency matching requirements, the connection between coarse quantization and precision quantization is achieved through the residual time detection module.

Benefits of technology

Analog-to-digital conversion with high sampling rate, low power consumption, and low area is realized, suitable for high-performance image sensors and infrared focal plane detectors, improving imaging quality and reducing power consumption.

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Abstract

The invention discloses a TDC-based two-step single-slope ADC circuit, a TDC-based two-step single-slope ADC conversion method and application, and the method comprises the steps: employing an M-bit single-slope SS ADC in the first step, employing a high-precision time resolution TDC in the second step for fine quantization, extracting residual time through a residual time detection module for the TDC to carry out counting quantization from the connection of coarse quantization to fine quantization, and enabling the TDC to carry out counting quantization; m-bit coarse quantization and N-bit fine quantization required by the two steps are formed; the TDC adopts a local ring oscillator to generate a high-frequency fine quantization clock required by TDC quantization in the second step, and external input is not needed; by adopting the N-bit mapping module, the accurate frequency matching requirement of the two-step ADC on the coarse quantization clock and the fine quantization clock is reduced, so that the ring oscillator can ensure the correct connection of the two-step ADC and the linearity of the ADC without a frequency correction circuit. The reading circuit does not need high-frequency precise quantization clock global transmission, limits the action time of the precise quantization clock, has the characteristic of low power consumption, and is suitable for an image sensor and an infrared focal plane detector reading circuit.
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