srs SG380 Series-Up to 6 GHz signal generators

srs SG380 Series-Up to 6 GHz signal generators

主要指标与说明The SG380 Series RF Signal Generators use a unique, innovative architecture (Rational Approximation Frequency Synthesis) to deliver ultra-high frequency resolution (1 μHz), excellent phase noise, and versatile modulation capabilities (AM, FM, ?M, pulse modulation and sweeps) at a fraction of the cost of competing designs.The standard models produce sine waves from DC to 2.025 GHz (SG382), 4.05 GHz (SG384) and 6.075 GHz (SG386).

SG380 Series RF Signal GeneratorsDC to 2 GHz, 4 GHz or 6 GHz1 μHz resolutionAM, FM, ?M, PM and sweepsOCXO timebase (std.)-116 dBc/Hz phase noise (20 kHz offset, f = 1 GHz)Rubidium timebaseSquare wave clock outputsAnalog I/Q inputsEthernet, GPIB and RS-232SG380 Series RF Signal GeneratorsIntroducing the new SG380 Series RF Signal Generators-finally, high performance, affordable RF sources.The SG380 Series RF Signal Generators use a unique, innovative architecture (Rational Approximation Frequency Synthesis) to deliver ultra-high frequency resolution (1 μHz), excellent phase noise, and versatile modulation capabilities (AM, FM, ?M, pulse modulation and sweeps) at a fraction of the cost of competing designs.The standard models produce sine waves from DC to 2.025 GHz (SG382), 4.05 GHz (SG384) and 6.075 GHz (SG386). There is an optional frequency doubler (Opt. 02) that extends the frequency range of the SG384 and SG386 to 8.10 GHz. Low-jitter differential clock outputs (Opt. 01) are available, and an external I/Q modulation input (Opt. 03) is also offered. For demanding applications, the SG380 Series can be ordered with a rubidium timebase (Opt. 04).On the Front PanelPhase NoiseAmplitude ModulationThe SG380 Series Signal Generators have 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 ? load. An N-type output sources frequencies from 950 kHz to 4.05 GHz with power from +16.5 dBm to -110 dBm (amplitude from 1 Vrms to 0.707 μVrms) into a 50 ? load.ModulationThe SG380 Signal Generators offer a wide variety of modulation capabilities. Modes include amplitude modulation (AM), frequency modulation (FM), phase modulation (ΦM), 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 as an output on the rear panel.Unlike traditional analog signal generators, the SG380 Series can sweep continuously from DC to 62.5 MHz. And for frequencies above 62.5 MHz, each sweep range covers more than an octave.

OCXO or Rubidium TimebaseThe SG380 Series come with a oven-controlled crystal oscillator (OCXO) timebase. The timebase uses a third-overtone stress-compensated 10 MHz resonator in a thermostatically controlled oven. The timebase provides very low phase noise and very low aging. An optional rubidium oscillator (Opt. 04) may be ordered to substantially reduce frequency aging and improve temperature stability.The internal 10 MHz timebase (either the standard OCXO or the optional rubidium reference) is available on a rear-panel output. An external 10 MHz timebase reference may be supplied to the rear-panel timebase input.Square Wave Clock OutputsOptional differential clock outputs (Opt. 01) are available on the rear-panel that make the SG384 a precision clock generator in addition to a signal generator. Transition times are typically 35 ps, and both the offset and amplitudes of the clock outputs can be adjusted for compliance with PECL, ECL, RSECL, LVDS, CML, and NIM levels.I/Q InputsOptional I/Q inputs (Opt. 03) allow I & Q baseband signals to modulate carriers from 400 MHz to 4.05 GHz. This option also allows the I/Q modulator to be driven by an internal noise generator with adjustable amplitude and bandwidth. Rear-panel outputs allow the noise source to viewed or used for other purposes.Output Frequency DoublerThe SG384 and SG386 can be ordered with a frequency doubler (Opt. 02) that extends the frequency range to 8.10 GHz. The amplitude of the rear-panel RF output can be adjusted from –10 dBm to +13 dBm. This option also comes with a bias source output which can be set with 5 mV resolution over ±10 VDC.Easy CommunicationRemote operation is supported with GPIB, RS-232 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.A New Frequency Synthesis TechniqueThe SG380 Series Signal Generators are based on a new frequency synthesis technique called Rational Approximation Frequency Synthesis (RAFS). RAFS uses small integer divisors in a conventional phase-locked loop (PLL) to synthesize a frequency that would be close to the desired frequency (typically within ±100 ppm) using the nominal PLL reference frequency. The PLL reference frequency, which is sourced by a voltage control crystal oscillator that is phase locked to a dithered direct digital synthesizer, is adjusted so that the PLL generates the exact frequency. Doing so provides a high phase comparison frequency (typically 25 MHz) yielding low phase noise while moving the PLL reference spurs far from the carrier where they can be easily removed. The end result is an agile RF source with low phase noise, essentially infinite frequency resolution, without the spurs of fractional-N synthesis or the cost of a YIG oscillator.Noise SpectraI/Q Noise ModulationPolar Plot 1Clock OutputsPolar Plot 2

SG380 Series RF Signal GeneratorsFrequency SettingFrequency ranges DC to 62.5 MHz (BNC output, all models) SG382 950 kHz to 2.025 GHz (N-type output) SG384 950 kHz to 4.05 GHz (N-type output)4.05 GHz to 8.1 GHz (w/ Opt. 02) SG386 950 kHz to 6.075 GHz (N-type output)6.075 GHz to 8.1 GHz (w/ Opt. 02)Frequency stability <1×10-11 (1 s Allan variance)Frequency resolution 1 μHz at any frequencySwitching speed <8 ms (to within 1 ppm)Frequency error <(10–18 + timebase error) × fCFront-Panel BNC OutputFrequency range DC to 62.5 MHzAmplitude 1.00 to 0.001 VrmsOffset ±1.5 VDCOffset resolution 5 mVMax. excursion 1.817 V (amplitude + offset)Amplitude resolution <1 %Amplitude accuracy ±5 %Harmonics <-40 dBcSpurious <-75 dBcOutput coupling DC, 50 Ω ±2 %User load 50 ΩReverse protection ±5 VDCFront-Panel N-Type OutputFrequency range SG382 950 kHz to 2.025 GHz SG384 950 kHz to 4.05 GHz SG386 950 kHz to 6.075 GHzPower output SG382 +16.5 dBm to -110 dBm SG384 +16.5 dBm to -110 dBm (<3 GHz) SG386 +16.5 dBm to -110 dBm (<4 GHz)Voltage output SG382 1.5 Vrms to 0.7 μVrms SG384 1.5 Vrms to 0.7 μVrms (<3 GHz) SG386 1.5 Vrms to 0.7 μVrms (<4 GHz)Power resolution 0.01 dBmPower accuracy ±1 dB (±2 dB above 4 GHz and +5 dBm)Output coupling AC, 50 ?User load 50 ?VSWR <1.6Reverse protection 30 VDC, +25 dBm RFSpectral Purity of the RF Output Referenced to 1 GHz*Sub harmonics none (No doubler used below 4 GHz)Harmonics <-25 dBc (<+7 dBm on N-type output)Spurious <10 kHz offset <-65 dBc >10 kHz offset <-75 dBcPhase noise (typ.) 10 Hz offset -80 dBc/Hz 1 kHz offset -102 dBc/Hz 20 kHz offset -116 dBc/Hz (SG382 & SG384), -114 dBc/Hz (SG386) 1 MHz offset -130 dBc/Hz (SG382 & SG384), -124 dBc/Hz (SG386)Residual FM (typ.) 1 Hz rms (300 Hz to 3 kHz bandwidth)Residual AM (typ.) 0.006 % rms (300 Hz to 3 kHz bandwidth)* Spurs, phase noise and residual FM scale by 6 dB/octave to other carrier frequenciesPhase Setting on Front-Panel OutputsMax. phase step ±360°Phase resolution 0.01° (DC to 100 MHz)0.1° (100 MHz to 1 GHz)1.0° (1 GHz to 8.1 GHz)Standard OCXO TimebaseOscillator type Oven controlled, 3rd OT, SC-cut crystalStability (0 to 45° C) <±0.002 ppmAging <±0.05 ppm/yearRubidium Timebase (opt. 04)Oscillator type Oven controlled, 3rd OT, SC-cut crystalPhysics package Rubidium vapor frequency discriminatorStability (0 to 45° C) <±0.0001 ppmAging <±0.001 ppm/yearTimebase InputFrequency 10 MHz, ±2 ppmAmplitude 0.5 to 4 Vpp (-2 dBm to +16 dBm)Input impedance 50 Ω, AC coupledTimebase OutputFrequency 10 MHz, sineSource 50 Ω, DC transformer coupledAmplitude 1.75 Vpp ±10 % (8.8 ± 1 dBm)Internal Modulation SourceWaveforms Sine, ramp, saw, square, pulse, noiseSine THD -80 dBc (typical at 20 kHz)Ramp linearity <0.05 % (1 kHz)Rate 1 μHz to 500 k Hz (fc ≤ 62.5 MHz (SG382 & SG384), fc ≤ 93.75 MHz (SG386))1 μHz to 50 k Hz (fc > 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386))Rate resolution 1 μHzRate error <1:231 + timebase errorNoise function White Gaussian noise (rms = dev/5)Noise bandwidth 1 μHz < ENBW < 50 kHzPulse generator period 1 μs to 10 sPulse generator width 100 ns t