Amplitude-interleaving analog digital composite signal processing circuit

Abstract

The invention belongs to the technical field of integrated circuits and particularly relates to an amplitude-interleaving analog digital composite signal processing circuit. The circuit at least comprises sampling capacitors and front-end switch arrays, wherein the sampling capacitors are directly proportional to the channel number; and the circuit further comprises a foldable multi-input operational amplifier and an analog signal channel selector judged based on the high-impedance state. The amplitude-interleaving technology realizes the signal storage exceeding the power supply voltage according to the difference charging and discharging principle of the passive device and records the information of partial signals in the form of figures, so that the purpose of simplifying the design index of the operational amplifier is achieved, and the difficult problem of design of the low supply voltage analog circuit in the advanced process is relieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit manufacturing, and in particular relates to an input stage circuit of analog and analog-digital mixed signals that widens the input range of a signal source. Background technique [0002] With the continuous development of modern information technology, people's demand for high-precision analog circuits and analog-digital hybrid circuits is also increasing. At the same time, due to the development of process technology, the technical nodes of integrated circuit manufacturing technology are constantly advancing, and the power supply voltage of analog circuits and analog-digital hybrid circuits is also decreasing. The input signal amplitude of high-precision analog and analog-digital hybrid circuits is mainly determined by the power supply voltage, while the noise amplitude is determined by thermal noise. The expression of thermal noise is: [0003] [0004] Where k is Boltzmann's con...

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Problems solved by technology

For every n-fold increase in the signal-to-noise ratio, the n-fold reduction in the thermal noise amplitude requires an increase in n 2 times the sampling capacitor, under the premise of ensuring the same charge and discharge speed, the output current of the final stage of the operational amplifier must also be increased correspondingly by n 2 times, that is, the power consumption of the entire analog and analog-to-digital hybrid circuit is also increased by n 2 times

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