Threshold computation circuit for S-FSK receiver, integrated circuit, and method associated therewith

    公开(公告)号:US10797921B2

    公开(公告)日:2020-10-06

    申请号:US16450065

    申请日:2019-06-24

    Abstract: A threshold computation circuit includes an input circuit, a maximum filter circuit, a minimum filter circuit, and a calculating circuit. The input circuit receives a discrete frequency signal from a digital filtering circuit. The discrete frequency signal is based on an S-FSK waveform received by an S-FSK receiver associated with the digital filtering circuit. The discrete frequency signal is representative of digital logic levels in a series of data frames modulated using S-FSK to form the S-FSK waveform. The maximum filter circuit adjusts a maximum amplitude parameter based on the discrete frequency signal and a predetermined threshold. The minimum filter circuit adjusts a minimum amplitude parameter based on the discrete frequency signal and the predetermined threshold. The calculating circuit adapts the predetermined threshold for a next data frame based on the maximum and minimum amplitude parameters. An integrated circuit and a method for computing the threshold are also disclosed.

    THRESHOLD COMPUTATION CIRCUIT FOR S-FSK RECEIVER, INTEGRATED CIRCUIT, AND METHOD ASSOCIATED THEREWITH

    公开(公告)号:US20200259690A1

    公开(公告)日:2020-08-13

    申请号:US16450065

    申请日:2019-06-24

    Abstract: A threshold computation circuit includes an input circuit, a maximum filter circuit, a minimum filter circuit, and a calculating circuit. The input circuit receives a discrete frequency signal from a digital filtering circuit. The discrete frequency signal is based on an S-FSK waveform received by an S-FSK receiver associated with the digital filtering circuit. The discrete frequency signal is representative of digital logic levels in a series of data frames modulated using S-FSK to form the S-FSK waveform. The maximum filter circuit adjusts a maximum amplitude parameter based on the discrete frequency signal and a predetermined threshold. The minimum filter circuit adjusts a minimum amplitude parameter based on the discrete frequency signal and the predetermined threshold. The calculating circuit adapts the predetermined threshold for a next data frame based on the maximum and minimum amplitude parameters. An integrated circuit and a method for computing the threshold are also disclosed.

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