High-speed and high-precision image signal analog-to-digital conversion circuit

Abstract

The invention discloses a high-speed and high-precision image signal analog-to-digital conversion circuit, belongs to the technical field of conversion circuits, the high-speed and high-precision image signal analog-to-digital conversion circuit comprises a multi-stage pipeline circuit, a delay alignment register array and a digital calibration circuit. Each stage of pipeline circuit comprises a sampling and holding module, two sub ADC modules, a sub DAC module, a subtraction circuit, a margin amplification module and an output register, an analog input signal is a group of pipeline circuits;firstly, a signal is sampled and held in the sampling and holding module; then, the signals are input into the sub ADC modules to be quantized; a digital signal is output to the output register and the sub DAC module; the sub-DAC modules convert signals into analog signals and then output the analog signals to the subtraction circuit, the analog signals are subtracted from the sampled and held signals, then the signals are amplified by a certain multiple through the margin amplification module and output to the delay alignment register array, the conversion speed is increased, the conversion quality is improved through comparison, and errors are avoided.

Description

technical field [0001] The invention belongs to the technical field of conversion circuits, and in particular relates to a high-speed, high-precision image signal analog-to-digital conversion circuit. Background technique [0002] An analog-to-digital converter, or A / D converter, or ADC for short, usually refers to an electronic component that converts an analog signal into a digital signal. A common analog-to-digital converter converts an input voltage signal into an output digital signal. Since the digital signal itself has no practical significance, it only represents a relative size. Therefore, any analog-to-digital converter needs a reference analog quantity as a conversion standard, and the more common reference standard is the largest convertible signal size. The output digital quantity represents the magnitude of the input signal relative to the reference signal. [0003] The following problems exist in the prior art: the conversion speed of the existing image sig...

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Problems solved by technology

[0003] The prior art has the following problems: the existing image signal analog-to-digital conversion circuit has a slow conversion speed during use, which affects the conversion speed of the image signal, and the structure is complicated at the same time, causing inconvenience in use

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