Bit extending system and bit extending method for analog-to-digital conversion

Abstract

The invention relates to a bit extending system and a bit extending method for analog-to-digital conversion. The bit extending method mainly comprises the following steps that a signal amplification module amplifies inputted analog signals into various analog amplification signals with gain ratios, a comparator judges whether the various analog amplification signals with the gain ratios exceed a preset voltage range or not; an analog amplification signal which has the highest gain ratio and does not exceed the voltage range is selected to be inputted in an analog-to-digital converter so as to be sampled and quantified into digital data, and the digital data are transferred rightwards according to the corresponding gain ratio. The gain ratio of an amplifier is not required to be adjusted, so that the noise is avoided, and sampling, quantification and judgment on the level of voltage are not required to be finished by the amplifier and can be finished by the comparator of which the cost is much lower than that of the analog-to-digital converter.

Description

technical field [0001] The present invention relates to an analog-to-digital conversion bit extension system, in particular to an analog-to-digital conversion bit extension system with a simplified overall system architecture and low cost. Background technique [0002] The intermediate frequency signal (Intermediate frequency, IF) mainly refers to a signal source generated after mixing with a local oscillating signal, which is mainly used to up-frequency or down-frequency the signal source to a specific frequency. After receiving at the receiving end, the received signal source must be lowered to the intermediate frequency signal by frequency reduction, and then the signal analysis work is performed. [0003] Electronic devices with information acquisition functions, such as spectrum analyzers, usually use an analog-to-digital converter (Analog to Digital Converter, ADC) to convert the voltage of the analog intermediate-frequency signal into power during the transmission of ...

AI Technical Summary

Problems solved by technology

[0012] To sum up, the bit expansion system of the early analog-to-digital conversion will affect the measurement accuracy due to noise caused by setting the amplifier magnification, while the bit expansion system that improves the analog-to-digital conversion by multi-channel amplification will still be affected by the analog-to-digital There is a problem of signal loss due to the response time of the converter, and the cost is increased; however, at least two analog-to-digital converters are needed to sample the pre-amplified signal and then determine the gain ratio. The expansion system still needs improvement

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