Table Of Contents

Linear Chirp Specifications

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    Last Modified: March 31, 2021

    The following specifications apply to the Configure Chirp (N Ch) VI when configuring a linear chirp signal.

    Start frequency range 0 to PDM rate/2
    Stop frequency range 0 to PDM rate/2
    Pre-chirp duration range 0 to 232 − 1 PDM samples, or approximately 23 minutes at PDM rate of 3.072 MHz
    Chirp duration range 0 to 232 − 1 − Pre-chirp duration samples

    The linear chirp rate range, in seconds, is defined by the following equation:

    Linear chirp rate range = ± ( Stop freq - Start freq ) / Chirp duration

    Refer to the following table for maximum chirp rates at different PDM rates.

    Table 1. Maximum Linear Chirp Rate at Different PDM Rates
    Maximum Linear Chirp Rate PDM Rate = 600 kHz PDM Rate = 800 kHz PDM Rate = 2.4 MHz PDM Rate = 3.072 MHz PDM Rate = 4.8 MHz
    Range ±1.37 MHz/s ±2.44 MHz/s ±21.9 MHz/s ±35.9 MHz/s ±87.8 MHz/s
    Minimum Time DC to PDM rate/2 7 ms 5 ms 2 ms 2 ms 1 ms

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