The new SG384 from Stanford Research Systems is a 4 GHz RF signal generator featuring an innovative architecture known as Rational Approximation Frequency Synthesis to deliver impressive performance figures. The unit boasts frequency resolution of 1 μHz and low phase noise at a competitive cost.
The standard model produces sine waves from DC to 4,05 GHz, while an optional frequency doubler extends the frequency range to 8,10 GHz. Low-jitter differential clock outputs are also available, as is an external I/Q modulation input. For demanding applications, the signal generator can be ordered with a rubidium time base.
The SG384 has two front-panel outputs with overlapping frequency ranges. A BNC provides outputs from DC to 62,5 MHz with adjustable offsets and amplitudes from 1 mV to 1 Vrms into a 50 Ω load. An N-type output supplies frequencies from 950 kHz to 4,05 GHz with power from +13 dBm to -110 dBm (1 Vrms to 0,707 μVrms) into a 50 Ω load.
The instrument offers a wide variety of modulation capabilities. Modes include amplitude modulation (AM), frequency modulation (FM), phase modulation (M) and pulse modulation. There is an internal modulation source as well as an external modulation input. The internal modulation source produces sine, ramp, saw, square and noise waveforms.
An external modulation signal may be applied to the rear-panel modulation input. The internal modulation generator is available on the rear-panel modulation output. Unlike traditional analog signal generators, the SG384 can sweep continuously from DC to 62,5 MHz; for frequencies above 62,5 MHz, each sweep range covers more than an octave.
Remote operation of the SG384 is supported with GPIB, RS232 and Ethernet interfaces. All instrument functions can be controlled and read over any of the interfaces. Up to nine instrument configurations can be saved in non-volatile memory.
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