Skip to the beginning of the images gallery

SRS SG384 4 GHz RF Signal Generator

Previous Next

Availability: In stock

Product Code:

29003

Manufacturer: Stanford Research Systems

Special Price £7,075.18 £8,490.22 Regular Price £8,752.80

DC to 4 GHz analog signal generator:

DC to 4 GHz
1 µHz resolution
AM, FM, ØM, PM and sweeps
OCXO timebase (std.)
-116 dBc/Hz SSB phase noise (20 kHz offset, f = 1 GHz)
Rubidium timebase (opt.)
Square wave clock outputs (opt.)
Analog I/Q inputs (opt.)
Ethernet, GPIB and RS-232 interfaces

Description

Lambda Exclusive Promotion:
Additional 12 months warranty for free (2 years total) via our UK Service Centre.

The Stanford Research Systems 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, ØM, 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).

The 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 +13 dBm to -110 dBm (amplitude from 1 Vrms to 0.707 µVrms) into a 50 O load.

Modulation
The SG380 Signal Generators offer a wide variety of modulation capabilities. Modes include amplitude modulation (AM), frequency modulation (FM), phase modulation (FM), 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.

Timebase
The 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.

Outputs
Optional 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.

Inputs
Optional 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.

Interfaces
Remote 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.

Frequency Synthesis
The 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.

Specifications

*SG380 Series RF Signal Generators*
Frequency Setting
Frequency 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 frequency
Switching speed	<8 ms (to within 1 ppm)
Frequency error	<(10^–18 + timebase error) × f_C
Front-Panel BNC Output
Frequency range	DC to 62.5 MHz
Amplitude	1.00 to 0.001 Vrms
Offset	±1.5 VDC
Offset resolution	5 mV
Max. excursion	1.817 V (amplitude + offset)
Amplitude resolution	<1 %
Amplitude accuracy	±5 %
Harmonics	<-40 dBc
Spurious	<-75 dBc
Output coupling	DC, 50 Ω ±2 %
User load	50 Ω
Reverse protection	±5 VDC
Front-Panel N-Type Output
Frequency range
SG382	950 kHz to 2.025 GHz
SG384	950 kHz to 4.05 GHz
SG386	950 kHz to 6.075 GHz
Power 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 dBm
Power accuracy	±1 dB (±2 dB above 4 GHz and +5 dBm)
Output coupling	AC, 50 Ω
User load	50 Ω
VSWR	<1.6
Reverse protection	30 VDC, +25 dBm RF
Spectral 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 dBc
Phase 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 frequencies
Phase Setting on Front-Panel Outputs
Max. 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 Timebase
Oscillator type	Oven controlled, 3rd OT, SC-cut crystal
Stability (0 to 45° C)	<±0.002 ppm
Aging	<±0.05 ppm/year
Rubidium Timebase (opt. 04)
Oscillator type	Oven controlled, 3rd OT, SC-cut crystal
Physics package	Rubidium vapor frequency discriminator
Stability (0 to 45° C)	<±0.0001 ppm
Aging	<±0.001 ppm/year
Timebase Input
Frequency	10 MHz, ±2 ppm
Amplitude	0.5 to 4 Vpp (-2 dBm to +16 dBm)
Input impedance	50 Ω, AC coupled
Timebase Output
Frequency	10 MHz, sine
Source	50 Ω, DC transformer coupled
Amplitude	1.75 Vpp ±10 % (8.8 ± 1 dBm)
Internal Modulation Source
Waveforms	Sine, ramp, saw, square, pulse, noise
Sine THD	-80 dBc (typical at 20 kHz)
Ramp linearity	<0.05 % (1 kHz)
Rate	1 µHz to 500 k Hz (f_c ≤ 62.5 MHz (SG382 & SG384), f_c ≤ 93.75 MHz (SG386)) 1 µHz to 50 k Hz (f_c > 62.5 MHz (SG382 & SG384), f_c > 93.75 MHz (SG386))
Rate resolution	1 µHz
Rate error	<1:2³¹ + timebase error
Noise function	White Gaussian noise (rms = dev/5)
Noise bandwidth	1 µHz < ENBW < 50 kHz
Pulse generator period	1 µs to 10 s
Pulse generator width	100 ns to 9999.9999 ms
Pulse timing resolution	5 ns
Pulse noise function	PRBS 2⁵ - 2¹⁹. Bit period (100 + 5N) ns
Modulation Waveform Output
Output impedance	50 Ω (for reverse termination)
User load	Unterminated 50 Ω coax
AM, FM, ØM	±1 V for ± full deviation
Pulse/Blank	"Low" = 0 V, "High" = 3.3 VDC
External Modulation Input
Modes	AM, FM, ØM, Pulse, Blank
Unmodulated level	0 V input for unmodulated carrier
AM, FM, ØM	±1 V input for ± full deviation
Modulation bandwidth	>100 kHz
Modulation distortion	<-60 dB
Input impedance	100 kΩ
Input offset	<500 µV
Pulse/Blank threshold	+1 VDC
Amplitude Modulation
Range	0 to 100 % (decreases above +7 dBm output)
Resolution	0.1 %
Modulation source	Internal or external
Modulation distortion	<1 % (f_c < 62.5 MHz, f_m = 1 kHz, BNC output) <3 % (f_c > 62.5 MHz, f_m = 1 kHz, N-type output)
Modulation bandwidth	>100 kHz
Frequency Modulation
Frequency deviation
Minimum	0.1 Hz
Maximum
*SG382 & SG384*
f_c < 62.5 MHz	Smaller of f_c or (64 MHz - f_c)
62.5 MHz < f_c ≤ 126.5625 MHz	1 MHz
126.5625 MHz < f_c ≤ 253.1250	2 MHz
253.1250 MHz < f_c ≤ 506.25 MHz	4 MHz
506.25 MHz < f_c ≤ 1.0125 GHz	8 MHz
1.0125 GHz < f_c ≤ 2.025 GHz	16 MHz
2.025 GHz < f_c ≤ 4.050 GHz (SG384)	32 MHz
4.050 GHz < f_c ≤ 8.100 GHz (Opt.02)	64 MHz
*SG386*
f_c < 93.75 MHz	Smaller of f_c or (96 MHz - f_c)
93.75 MHz < f_c ≤ 189.84375 MHz	1 MHz
189.84375 MHz < f_c ≤ 379.6875 MHz	2 MHz
379.6875 MHz < f_c ≤ 759.375 MHz	4 MHz
759.375 MHz < f_c ≤ 1.51875 GHz	8 MHz
1.51875 GHz < f_c ≤ 3.0375 GHz	16 MHz
3.0375 GHz < f_c ≤ 6.075 GHz (SG384)	32 MHz
6.075 GHz < f_c ≤ 8.100 GHz (Opt.02)	64 MHz
Deviation resolution	0.1 Hz
Deviation accuracy	<0.1 % (f_c ≤ 62.5 MHz (SG382 & SG384), f_c ≤ 93.75 MHz (SG386)) <3 % (f_c > 62.5 MHz (SG382 & SG384), f_c > 93.75 MHz (SG386))
Modulation source	Internal or external
Modulation distortion	<-60 dB (f_c = 100 MHz, f_M = 1 kHz, f_D = 1 kHz)
Ext FM carrier offset	<1:1,000 of deviation
Modulation bandwidth	500 kHz (f_c ≤ 62.5 MHz (SG382 & SG384), f_c ≤ 93.75 MHz (SG386))
	100 kHz (f_c > 62.5 MHz (SG382 & SG384), f_c > 93.75 MHz (SG386))
Frequency Sweeps (Phase Continuous)
Frequency span	10 Hz to entire sweep range
Sweep ranges
SG382 & SG384	DC to 64 MHz 59.375 to 128.125 MHz 118.75 to 256.25 MHz 237.5 to 512.5 MHz 475 to 1025 MHz 950 to 2050 MHz 1900 to 4100 MHz (SG384) 3800 to 8200 MHz (opt. 02 only)
SG386	DC to 96 MHz 89.0625 MHz to 192.188 MHz 178.125 MHz to 384.375 MHz 356.25 MHz to 768.75 MHz 712.5 MHz to 1537.5 MHz 1425 MHz to 3075 MHz 2850 MHz to 6150 MHz 5950 MHz to 8150 MHz (w/ Opt. 02)
Deviation resolution	0.1 Hz
Sweep source	Internal or external
Sweep distortion	<0.1 Hz + deviation/1,000
Sweep offset	<1:1,000 of deviation
Sweep function	Triangle, ramp or sine sweeps up to 120 Hz
Phase Modulation
Deviation	0 to 360°
Deviation resolution	0.01° to 100 MHz, 0.1° to 1 GHz, 1° above 1 GHz
Deviation accuracy
	<0.1 % (f_c ≤ 62.5 MHz (SG382 & SG384), f_c ≤ 93.75 MHz (SG386)) <3 % (f_c > 62.5 MHz (SG382 & SG384), f_c > 93.75 MHz (SG386))
Modulation source	Internal or external
Modulation distortion	<-60 dB (f_c = 100 MHz, f_M =1 kHz, Ø_D =50°)
Modulation bandwidth	500 kHz (f_c ≤ 62.5 MHz (SG382 & SG384), f_c ≤ 93.75 MHz (SG386)) 100 kHz (f_c > 62.5 MHz (SG382 & SG384), f_c > 93.75 MHz (SG386))
Pulse/Blank Modulation
Pulse mode	Logic "high" turns RF "on"
Blank mode	Logic "high" turns RF "off"
On/Off ratio
BNC output	70 dB
Type-N output	57 dB (f_c < 1 GHz) 40 dB (1 GHz ≤ f_c< 4 GHz) 35 dB (f_c ≥ 4 GHz)
Pulse feed-through	10 % of carrier for 20 ns at turn-on (typ.)
Turn on/off delay	60 ns
RF rise/fall time	20 ns
Modulation source	Internal or external pulse
External I/Q Modulation (opt. 03)
Carrier frequency range	400 MHz to 2.025 GHz (SG382) 400 MHz to 4.05 GHz (SG384) 400 MHz to 6.075 GHz (SG386)
Modulated output	Front-panel N-type only
I/Q inputs	50 Ω, ±0.5 V
I or Q input offset	<500 µV
I/Q full scale	(I²+ Q²)^1/2 = 0.5 V
Carrier suppression	>40 dBc (>35 dBc above 4 GHz)
Modulation bandwidth	200 MHz (-3 dB)
Square Wave Clock Outputs (opt. 01)
Differential clocks	Rear-panel SMAs drive 50 Ω loads
Frequency range	DC to 4.05 GHz
Transition time	<35 ps (20 % to 80 %)
Jitter
(f_c > 62.5 MHz)	300 fs rms (typical, 1 kHz to 5 MHz BW at 1 GHz)
(f_c ≤ 62.5 MHz)	<10^-4 U.I. (1 kHz to 5 MHz or f_c/2 BW)
Amplitude	0.4 to 1 Vpp
Offset	±2 VDC
Ampl & Offs resolution	5 mV
Ampl & Offs accuracy	±5 %
Output coupling	DC, 50 Ω ±2 %
Compliance	ECL, PECL, RSECL, CML, NIM & LVDS
Frequency Doubler Output (opt. 02)
Output	Rear-panel SMA
Frequency range	4.05 GHz to 8.10 GHz (SG384) 6.075 GHz to 8.10 GHz (SG386)
RF amplitude	-10 dBm to +13 dBm (4.05 GHz to 7 GHz) >-10 dBm to +7 dBm (7 GHz to 8.10 GHz) +13 to +16.5 dBm (spec. not guaranteed)
Sub harmonic (f_c/2)	<-25 dBc (fC < 6.5 GHz) <-12 dBc (fC < 8.1 GHz)
Mixing products (3f_c/2)	<-20 dBc
Harmonics (n x f_c)	<-25 dBc
Spurious (8 GHz)	<-55 dBc (>10 kHz offset)
Phase noise (8 GHz)	-98 dBc/Hz at 20 kHz offset (typ.)
Amplitude resolution	0.01 dBm
Amplitude accuracy	±1 dB (4.05 GHz to 6.5 GHz) ±2 dB (6.5 GHz to 8.1 GHz)
Modulation modes	FM, ØM, Sweeps
Output coupling	AC, 50 Ω
Reverse protection	30 VDC, +25 dBm RF
DC Bias Source (comes with opt. 02)
Output	Rear-panel SMA
Voltage range	±10 V
Offset voltage	<20 mV
DC accuracy	±0.2 %
DC resolution	5 mV
Output resistance	50 Ω
Current limit	20 mA
Computer Interfaces (all are standard)
Ethernet (LAN)	10/100 Base-T. TCP/IP & DHCP default
GPIB	IEEE-488.2
RS-232	4800 to 115,200 baud, RTS/CTS flow line
General
Line power	<90 W, 90 to 264 VAC, 47 to 63 Hz with PFC
Dimensions	8.5" × 3.5" × 13" (WHL)
Weight	10 lbs.
Warranty	One year parts and labor on defects in materials & workmanship

Downloads

Stanford Research Systems SG380 Series Datasheet

Stanford Research Systems SG380 Series RF Signal Generators User Manual

Technical Overview of Four RF Signal Generators

Why buying from Lambda makes sense

Reviews

Write Your Own Review

Product	SKU
SRS SG382 2 GHz RF Signal Generator	-	>
SRS SG392 2 GHz RF Vector Signal Generator	-	>
SRS SG386 6 GHz RF Signal Generator	-	>
SRS SG394 4 GHz RF Vector Signal Generator	-	>
SRS SG396 6 GHz RF Vector Signal Generator	-	>

SRS SG384 4 GHz RF Signal Generator

More info and finance questions

Company

Support

Contact Us