公开(公告)号：GB2606238A

公开(公告)日：2022-11-02

申请号：GB202115782

申请日：2021-11-03

Applicant: IBM

Inventor： SUDIPTO CHAKRABORTY ,  RAYMOND RICHETTA ,  PAT ROSNO

IPC: H03H11/04 ,  G06N10/40

Abstract: A filter stage system includes a continuous time baseband filter 500 that generates a filtered current iout, and a mirroring component (Fig.1, 106) that mirrors the filtered current to an output (Fig.1, 108). The continuous time baseband filter comprises a feedback loop that employs at least one first impedance node, at C1, providing a dominant pole and at least one second impedance node, at C2, providing a non-dominant pole; the first impedance node has a higher impedance that the second impedance node. A method for quantum computing and a computer program product, each using the filter stage system, are also provided. The mirroring component may selectively change a mirroring ratio to achieve a variable gain. The continuous time baseband filter may be single-ended or differential (Fig.10). The system may include a plurality of continuous time baseband filters, a subset of which may provide low-pass, band-pass or high-pass characteristics. The filter may be used in a radio frequency (RF) digital-to-analog converter (DAC) (Fig.1, 100) and in applications where the low distortion provided by current mode processing is advantageous, such as arbitrary waveform generation.