On-chip sine wave excitation generator and manufacturing method

Abstract

The invention belongs to the technical field of integrated circuit design, and discloses an on-chip sine wave excitation generator, which comprises a lookup table LUT, a digital-to-analog converter DAC and a low-pass filter, and is characterized in that pre-stored data in the lookup table LUT is obtained by processing a sine wave signal needing to be generated through a pre-distortion method and a Sigma Delta modulator in sequence; the order L and the oversampling rate OSR of the Sigma Delta modulator are determined by the signal-to-noise ratio SNR of a sine wave signal needing to be generated, the level quantity of a quantizer of the Sigma Delta modulator is determined by the resolution of a digital-to-analog converter DAC, and according to the harmonic distortion condition of an output signal passing through the digital-to-analog converter DAC and a low-pass filter, the level quantity of a quantizer of the Sigma Delta modulator is determined by the level quantity of a quantizer of the Sigma Delta modulator. And selecting a corresponding pre-distortion method to eliminate the Nth harmonic in the sine wave signal needing to be generated. The invention further discloses a manufacturing method of the on-chip sine wave excitation generator.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to an on-chip sine wave excitation generator and a manufacturing method. Background technique [0002] The cost of post-silicon verification accounts for about 50% of the cost of developing a chip. Therefore, it is necessary to invent a lower-cost on-chip test method to reduce the dependence of post-silicon verification on high-end automated test instruments, Parallel characterization with the lowest possible cost. In the design of low-cost on-chip test solutions, it is a design difficulty to use a medium-precision digital-to-analog converter to implement a low-noise, high-linearity sinusoidal excitation generator. [0003] The on-chip sinusoidal excitation generator generally consists of a look-up table, a digital-to-analog converter, and a low-pass filter. Among them, the excitation signal data of one cycle is stored in the look-up table, and then the control s...

AI Technical Summary

Problems solved by technology

The implementation of this method only needs to modify the data stored in the lookup table. The side effect is that when a certain harmonic distortion is eliminated, a new harmonic distortion will be generated near the sampling frequency, so the sampling frequency must be fast enough.

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