Basics of Vector Signal Generators Part 1: Real-time waveform generation mode
White Papers
Engineers use signal generators to test RF components, receivers, and test systems in various applications, such as design, verification, troubleshooting, manufacturing, and repair. The output can range from a simple continuous wave (CW) to a complex digitally modulated signal. Analog signal generators supply sinusoidal CW signals and several types of analog modulation, like analog, frequency, and pulse modulation. Vector signal generators add the ability to create digital modulation schemes. Traditional vector signal generators have a built-in baseband IQ modulator to generate complex modulation formats, such as quadrature phase-shift keying (QPSK), quadrature amplitude modulation (QAM), and more complex orthogonal frequency-division multiplexing (OFDM) signals. Some nextgeneration vector signal generators replace the IQ modulator with direct digital synthesis technology to produce the same complex formats with higher signal fidelity and better overall modulation quality.