Patent ID: 11901922
Assignee: HONEYWELL INTERNATIONAL INC.
Field: Measurement (Instruments)
Classification: CPC H  G | IPC H

Claim 11:
12. A method comprising:
converting, by a digital-to-analog converter (DAC) based on a clock rate (fs), a digital signal to an analog signal comprising analog signal content from signal images in more than one Nyquist region;
filtering out, by a bandpass filter, a first portion of the analog signal content that is within a lowest Nyquist region to generate an intermediate-frequency (IF) signal comprising IF signal content that is in Nyquist regions above the lowest Nyquist region, wherein the lowest Nyquist region comprises frequencies between zero and one-half of fs;
up-converting, by a mixer based on a local oscillator (LO) signal, the IF signal from an output of the DAC to a radio-frequency (RF) signal;
generating the LO signal with an LO circuit;
filtering the RF signal by at least removing, from the RF signal, first RF signal content that is in a first frequency range that is greater than a difference between a frequency of the LO signal and one-half of fs and less than a sum of the frequency of the LO signal and one-half of fs, resulting in a filtered RF signal, wherein the filtered RF signal comprises second RF signal content in a second frequency range that is greater than the sum of the frequency of the LO signal and one-half of fs; and
transmitting the filtered RF signal.