Agilent Technologies E8267C PSG Manuale Utente Scaricare il pdf (Pagina 9)

Vector Test Stimulus

Rather than summing CW signals from multiple analog signal generators to create

multitone signals, an equivalent test stimulus can be achieved from a single signal

generator using a vector approach. The PSG vector signal generator takes advantage

of its internal baseband generator and integrated I/Q modulator to generate multitone

signals with fixed or random initial phase sets. Figure 7 shows the simplified hardware

setup to generate multitone test stimulus using the PSG vector signal generator.

Figure 7. Simplified setup to generate a multitone test stimulus using the vector approach.

This technique employs complex modulation to deliver an accurate and repeatable

multitone test signal (with up to 64 tones!) that can easily be configured to perform

either in-band or out-of-band distortion measurements by setting the characteristics of

each tone independently. Multitone waveforms are created at baseband frequencies and

upconverted to the desired carrier frequency using an I/Q modulator. To illustrate this

concept, consider the examples in Figure 8.

Isolator

AMP

LPF

Combiner

External equipmentBank of PSG CW signal generators

E8267C PSG vector signal generator

Internal baseband generator

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Agilent Technologies E8267C PSG Manuale Utente Pagina 9