Method for measuring locking time and frequency error in RF receiver
OwnerWei Guoinventor
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Abstract
A method is provided for measuring the locking time of an RF receiver. The method comprises inputting to the RF receiver an input sine wave with a certain frequency difference relative to the system operation frequency. An oscilloscope is used to capture the analog I and Q output signal of the receiver. The locking time is determined from the waveform imaged on the screen of the oscilloscope. Using the method allows measuring locking time accurately and in a short amount of time.
Claims5
A method of measuring radio frequency (RF) receiver locking time, the method comprising:
- inputting to the RF receiver an input sine wave that has a predetermined frequency difference relative to a system operation frequency of the RF receiver;
- transforming in the RF receiver the input sine wave into in-phase (I) and quadrature (Q) components and outputting the I and Q components to an oscilloscope;
- using the oscilloscope to capture the I and Q output signal of the receiver and displaying the I and Q output signal onto a screen of the oscilloscope;
- determining a locking time from the waveform imaged on the screen of the oscilloscope as the interval between initial capture of the I and Q output signal by the oscilloscope and when a stable sine wave occurs.
A method of measuring locked frequency error of a radio frequency (RF) receiver, the method comprising:
- inputting to the RF receiver an input sine wave with a predetermined frequency difference relative to a system operation frequency of the RF receiver;
- transforming in the RF receiver the input sine wave into in-phase (I) and quadrature (Q) components and outputting the I and Q components to an oscilloscope;
- using an oscilloscope to capture an analog I and Q output signal of the receiver and displaying the I and Q output signal onto a screen of the oscilloscope;
- determining a frequency error from comparing the frequency of the output waveform imaged on the screen of the oscilloscope to that of the input sine wave.
Dependencies are inferred from the claim text.