Analog-to-digital conversion circuit for complement quantization of RRAM storage and calculation integrated chip

Abstract

The invention relates to an analog-to-digital conversion circuit, in particular to an analog-to-digital conversion circuit for complement quantization of an RRAM storage and calculation integrated chip, which comprises a current and voltage conversion module, eight sampling switches, two asymmetric capacitor arrays, a comparator and a logic control module. Thecurrent and voltage conversion module converts the output current of the RRAM array into a voltage, one sampling switch is connected with one asymmetric capacitor array, the other seven sampling switches are connected with the other asymmetric capacitor array, the two asymmetric capacitor arrays are connected with the two input ends of the comparator, and the output end of the comparator is connected with the logic control module. The logic control module outputs a comparator control clock and a capacitor array control signal, and outputs a quantization result. Through the novel complement quantization analog-to-digital converter, the problem of complement quantization of multi-bit weight of an RRAM storage and calculation integrated chip in array multiplication and addition operation can be solved, the operation rate and the degree of parallelism of the RRAM storage and calculation integrated chip are improved, and the area of the chip is saved.

Description

technical field [0001] The invention relates to an analog-to-digital conversion circuit, in particular to an analog-to-digital conversion circuit used for complementary code quantization of an RRAM memory-computing integrated chip. Background technique [0002] The current mainstream computer architecture is facing the von Neumann bottleneck due to the separation of storage and computing modules. The in-memory computing technology based on RRAM can realize the integration of storage unit and logic unit, break through the von Neumann bottleneck, and promote the development of artificial intelligence and integrated circuit technology. When the RRAM-based memory-computing integrated chip is used in artificial intelligence applications, the most critical link is the multiplication and addition operation of the array, that is, the multiplication and addition operation of the input signal and the storage weight, and the readout of the result is quantization, so the design is reaso...

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Problems solved by technology

[0003] The present invention provides an analog-to-digital conversion circuit for complementary code quantization of an RRAM integrated chip to solve the problem of complementary code quantization of RRAM arrays in multiplication and addition operations. A PN-DAC asymmetrical SAR ADC structure is adopted, wherein P-DAC receives the sign bit output in the RRAM array, N-DAC receives the digital bit output in the RRAM array, and adjusts the weight of each bit through charge redistribution, and finally realizes the complement quantization of the output result of the RRAM array

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