Analog-to-digital converting device and analog-to-digital converting method

Abstract

An analog-to-digital converting device (100, 200) includes: an integrator (102, 202) arranged to generate an integrating signal according to an analog input signal and a first analog feedback signal; a low-pass filter (104, 304, 404, 504, 604, 704) arranged to generate a first filtered signal according to the integrating signal; an analog-to-digital converter (106) arranged to generate a digital output signal according to the first filtered signal; and a first digital-to-analog converter (108) arranged to generate the first analog feedback signal according to the digital output signal.

Description

【Technical field】 [0001] The present invention relates to an analog-to-digital conversion device and a related method, in particular to an analog-to-digital conversion device with filtering function and a related method. 【Background technique】 [0002] In a wireless communication system, after a radio frequency signal is received by an antenna, an analog-to-digital conversion device is used to convert the analog signal into a digital signal. However, the antenna may receive signals other than the desired signal at the same time, so a filter is used to filter the unwanted signal before the signal is input to the ADC. Generally speaking, a filter that occupies a large area or consumes a large amount of power has a better filtering effect, but it also means that the cost of the filter is more expensive, and if a filter with a poor filtering effect is used, the module The digital converter needs to have a wide dynamic range so that unwanted signals can be suppressed by the anal...

AI Technical Summary

Problems solved by technology

Generally speaking, a filter that occupies a large area or consumes a large amount of power has a better filtering effect, but it also means that the cost of the filter is more expensive, and if a filter with a poor filtering effect is used, the module The digital converter needs to have a wide dynamic range so that unwanted signals can be suppressed by the analog-to-digital converter. However, the dynamic range of the analog-to-digital converter is inversely proportional to the supply voltage of the analog-to-digital converter, and the supply voltage is Under the advanced semiconductor process, it will only get smaller and smaller

Another way to increase the dynamic range of the ADC is to lower the noise floor of the ADC, however, this method may again increase the Therefore, it is an urgent problem in the field of wireless communication systems to provide a filter-type analog-to-digital converter to reduce the consumption of area and cost.

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