09-02-2017 дата публикации
Номер: US20170041087A1
A method for operating a phase shifter chip RF self-test. The method includes outputting, by control hardware, a first signal from a phased locked loop to a pre-amplifier and an input peak detector, outputting, by the control hardware, a second signal from the pre-amplifier to a device under test, selecting, by the control hardware, a target level, and adjusting, by the control hardware, a pre-amplifier gain of the pre-amplifier to cause the input peak detector value to approximately match the target level. The input peak detector is configured to output an input peak detector value based on the first signal. 1. A method comprising:outputting, by control hardware, a first signal from a phased locked loop to a pre-amplifier and an input peak detector, wherein the input peak detector is configured to output an input peak detector value based on the first signal;outputting, by the control hardware, a second signal from the pre-amplifier to a device under test;selecting, by the control hardware, a target level; andadjusting, by the control hardware, a pre-amplifier gain of the pre-amplifier to cause the input peak detector value to approximately match the target level.2. The method of claim 1 , further comprising:adjusting, by the control hardware, a precision variable gain adjuster connected to the pre-amplifier; andmeasuring an output peak detector value of an output peak detector connected to an output of the device under test.3. The method of claim 2 , further comprising adjusting claim 2 , by the control hardware claim 2 , a device under test gain of the device under test until the output peak detector value approximately matches the target level.4. The method of claim 3 , further comprising:stopping, by the control hardware, all signals to the pre-amplifier and the device under test;measuring, by the control hardware, a current input peak detector value of the input peak detector as an input peak detector offset; andmeasuring a current output peak detector value ...
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