US Patent 10345418 Calibration device for automatic test equipment

Example automatic test equipment (ATE) includes: a test instrument for outputting test signals to test a device under test (DUT), and for receiving response signals based on the test signals; a device interface board (DIB) connected to the test instrument, with the DIB including an application space having a site to which the DUT connects, and with the test signals and the response signals passing through the site; and calibration circuitry in the application space on the DIB. The calibration circuitry includes a communication interface over which communications pass, with the communications comprising control signals to the calibration circuitry and measurement signals from the calibration circuitry. The calibration circuitry also includes non-volatile memory to store calibration data and is controllable, based on the control signals, to pass the test signals from the test instrument to the DUT and to pass the response signals from the DUT to the test instrument.