Patent ID: 8649989
Filing Date: 2014-02-11
Classification: G01R

Abstract:
1. A test and measurement instrument, comprising: an input terminal to receive a radio frequency (RF) signal under test; an analog-to-digital converter (ADC) to digitize the RF signal; a digital downconverter to produce I (in-phase) and Q (quadrature) baseband component information from the digitized RF signal; a power detector to determine a power level using the I and Q baseband component information; one or more demodulators to produce IQ-based time-domain traces when the power level determined by the power detector exceeds a predefined power threshold, wherein the predefined power threshold is user-definable; a comparator operatively coupled to the power detector and configured to compare the user-definable power threshold with the power level received from the power detector, the comparator producing a logic signal for enabling the one or more demodulators, wherein the logic signal includes a trigger enable signal; trigger circuitry configured to trigger on an event associated with the IQ-based time-domain traces responsive to the trigger enable signal when the IQ-based time domain trace is within a window defined by first and second thresholds; and a display unit for displaying the I and Q baseband component information in response to a trigger signal generated by the trigger circuitry.