CN111740742A - A high-speed, high-precision image signal analog-to-digital conversion circuit - Google Patents

Abstract

The invention discloses a high-speed high-precision image signal analog-digital conversion circuit, belonging to the technical field of conversion circuits, wherein the high-speed high-precision image signal analog-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 sample-hold 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, the signal is sampled and held by the sample-hold module, then, the signal is input to the sub-ADC module to be quantized, a digital signal is output to the output register and the sub-DAC module, the sub-DAC module converts the signal into an analog signal and then outputs the analog signal to the subtraction circuit, the analog signal is subtracted from the signal after the sample-hold, and then, the signal is amplified by a certain multiple through the margin amplification module and then is output, the conversion speed is improved, and through comparison, the conversion quality is improved, and errors are avoided.

Description

A high-speed, high-precision image signal analog-to-digital conversion circuit

technical field

The invention belongs to the technical field of conversion circuits, in particular to a high-speed and high-precision image signal analog-to-digital conversion circuit.

Background technique

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 typical 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 the conversion standard. The more common reference standard is the maximum convertible signal size. The output digital quantity represents the magnitude of the input signal relative to the reference signal.

The existing technology 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 at the same time, the structure is complicated, which causes inconvenience in use.

SUMMARY OF THE INVENTION

In order to solve the problems raised in the above background art. The invention provides a high-speed and high-precision image signal analog-to-digital conversion circuit, which has the characteristics of simple structure, fast conversion speed and portable use.

In order to achieve the above purpose, the present invention provides the following technical solutions: a high-speed, high-precision image signal analog-to-digital conversion circuit, the high-speed, high-precision image signal analog-to-digital conversion circuit includes a multi-stage pipeline circuit, a delay alignment register array and digital calibration circuit, each stage of pipeline circuit includes sample and hold module, two sub-ADC modules, sub-DAC module, subtraction circuit, residual amplifier module and output register, a set of pipeline circuits for analog input signal, firstly in the sample-and-hold module pair The signal is sampled and held, and then the signal is input to the sub-ADC module to quantize the signal, and the digital signal is output to the output register and sub-DAC module. The sub-DAC module converts the signal into an analog signal and outputs it to the subtraction circuit. The signal is subtracted, and then the signal is amplified by a certain multiple and output to the delay alignment register array through the margin amplification module. The output register of each group of pipeline circuits is connected to the delay alignment register array, and the delay alignment register array is output. Connected with digital calibration circuit, the signal is output after calibration.

Further in the present invention, the high-speed, high-precision image signal analog-to-digital conversion circuit includes a timer, and the output of the timer is respectively connected with the delay alignment register array and the digital calibration circuit.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention includes a sampling and holding module, two sub-ADC modules, sub-DAC modules, a subtraction circuit, a residual amplifying module and an output register in each stage of the pipeline circuit, and a set of pipeline circuits for simulating the input signal. After sampling and holding, the signal is input to the sub-ADC module to quantize the signal, and the digital signal is output to the output register and sub-DAC module. The sub-DAC module converts the signal into an analog signal and outputs it to the subtraction circuit. Then, the signal is amplified by a certain multiple and output to the delay alignment register array through the margin amplifying module, which improves the conversion speed, and through comparison, improves the conversion quality and avoids errors.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, the present invention provides the following technical solutions: a high-speed, high-precision image signal analog-to-digital conversion circuit, the high-speed, high-precision image signal analog-to-digital conversion circuit includes a multi-stage pipeline circuit, a delay alignment register array and a digital calibration The circuit, each stage of the pipeline circuit includes a sample and hold module, two sub-ADC modules, a sub-DAC module, a subtraction circuit, a residual amplifier module and an output register, a set of pipeline circuits for analog input signals, first in the sample-and-hold module to sample the signal Hold, then input the signal to the sub-ADC module to quantify the signal, and output the digital signal to the output register and sub-DAC module. The sub-DAC module converts the signal into an analog signal and outputs it to the subtraction circuit, and the analog signal is subtracted from the sampled and held signal. Then, the signal is amplified by a certain multiple and output to the delay alignment register array through the margin amplification module. The output register of the output of each group of pipeline circuits is connected with the delay alignment register array, and the delay alignment register array output and digital calibration The circuit is connected, and the signal is output after calibration.

Further, the high-speed, high-precision image signal analog-to-digital conversion circuit includes a timer, and the output of the timer is respectively connected with the delay alignment register array and the digital calibration circuit.

The working principle and use process of the present invention: the analog-to-digital conversion circuit of the present invention includes a multi-stage pipeline circuit, a delay alignment register array and a digital calibration circuit, and each stage of the pipeline circuit includes a sample and hold module, two sub-ADC modules, and a sub-DAC. Module, subtraction circuit, residual amplifier module and output register, a set of pipeline circuits for analog input signal, firstly, the signal is sampled and held in the sample and hold module, and then the signal is input to the sub-ADC module to quantize the signal, and the digital signal is output to the output Register and sub-DAC module, the sub-DAC module converts the signal into an analog signal and outputs it to the subtraction circuit, the analog signal is subtracted from the signal after sampling and holding, and then the signal is amplified by a certain multiple of the residual amplifier module and output to the delay alignment register array , the output register of each group of pipeline circuits is connected with the delay alignment register array, the output of the delay alignment register array is connected with the digital calibration circuit, and the signal is output after being calibrated.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (2)

1. a high-speed, high-precision image signal analog-to-digital conversion circuit, is characterized in that: the described high-speed, 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 The first-stage pipeline circuit includes a sample-and-hold module, two sub-ADC modules, a sub-DAC module, a subtraction circuit, a residual amplifier module and an output register, and a set of pipeline circuits for analog input signals. First, the sample-and-hold module samples and holds the signal, and then Input the signal to the sub-ADC module to quantize the signal, and output the digital signal to the output register and sub-DAC module. The sub-DAC module converts the signal into an analog signal and outputs it to the subtraction circuit. The analog signal is subtracted from the sampled and held signal, and then processed by The margin amplification module amplifies the signal by a certain multiple and outputs it to the delay alignment register array. The output register of each group of pipeline circuits is connected to the delay alignment register array, and the delay alignment register array output is connected to the digital calibration circuit. The signal is output after calibration. 2. A high-speed, high-precision image signal analog-to-digital conversion circuit according to claim 1, characterized in that: the high-speed, high-precision image signal analog-to-digital conversion circuit comprises a timer, and the output of the timer is respectively The delay alignment register array is connected to the digital calibration circuit.

Images