Patent ID: 11874308
Assignee: KEYSIGHT TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A test instrument, comprising a real-time spectrum analyzer (RTSA) and a display, wherein the RTSA comprises:
analog-to-digital converter (ADC) configured to convert in real-time an input analog signal into a digital input data stream;
a digital down-converter (DDC) configured to down-convert in real-time the digital input data stream into a down-converted input data stream;
a fast Fourier transform (FFT) unit configured to generate in real-time FFTs of the down-converted input data stream;
an acquisition memory circuit configured to store in real-time the FFTs generated by the FFT unit; and
an plotter configured to read in non-real time the FFTs stored in the acquisition memory and to generate display data for the display, the display data being a frequency domain representation of the input analog signal.