Home Stanford Research Systems SRS SG384 4 GHz RF Signal Generator

SRS SG384 4 GHz RF Signal Generator

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

More info and finance questions

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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.

 

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) × fC

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 (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 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 % (fc < 62.5 MHz, fm = 1 kHz, BNC output)
<3 % (fc > 62.5 MHz, fm = 1 kHz, N-type output)

   

Modulation bandwidth

>100 kHz

   

Frequency Modulation

   

Frequency deviation

   

   Minimum

0.1 Hz

   

   Maximum

   

      SG382 & SG384

   

         fc < 62.5 MHz

Smaller of fc or (64 MHz - fc)

   

         62.5 MHz < fc ≤ 126.5625 MHz

1 MHz

   

         126.5625 MHz < fc ≤ 253.1250

2 MHz

   

         253.1250 MHz < fc ≤ 506.25 MHz

4 MHz

   

         506.25 MHz < fc ≤ 1.0125 GHz

8 MHz

   

         1.0125 GHz < fc ≤ 2.025 GHz

16 MHz

   

         2.025 GHz < fc ≤ 4.050 GHz (SG384)

32 MHz

   

         4.050 GHz < fc ≤ 8.100 GHz (Opt.02)

64 MHz

   

      SG386

   

         fc < 93.75 MHz

Smaller of fc or (96 MHz - fc)

   

         93.75 MHz < fc ≤ 189.84375 MHz

1 MHz

   

         189.84375 MHz < fc ≤ 379.6875 MHz

2 MHz

   

         379.6875 MHz < fc ≤ 759.375 MHz

4 MHz

   

         759.375 MHz < fc ≤ 1.51875 GHz

8 MHz

   

         1.51875 GHz < fc ≤ 3.0375 GHz

16 MHz

   

         3.0375 GHz < fc ≤ 6.075 GHz (SG384)

32 MHz

   

         6.075 GHz < fc ≤ 8.100 GHz (Opt.02)

64 MHz

   

Deviation resolution

0.1 Hz

   

Deviation accuracy

<0.1 % (fc ≤ 62.5 MHz (SG382 & SG384), fc ≤ 93.75 MHz (SG386))
<3 % (fc > 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386))

   

Modulation source

Internal or external

   

Modulation distortion

<-60 dB (fc = 100 MHz, fM = 1 kHz, fD = 1 kHz)

   

Ext FM carrier offset

<1:1,000 of deviation

   

Modulation bandwidth

500 kHz (fc ≤ 62.5 MHz (SG382 & SG384), fc ≤ 93.75 MHz (SG386))

   

 

100 kHz (fc > 62.5 MHz (SG382 & SG384), fc > 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 % (fc ≤ 62.5 MHz (SG382 & SG384), fc ≤ 93.75 MHz (SG386))
<3 % (fc > 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386))

   

Modulation source

Internal or external

   

Modulation distortion

<-60 dB (fc = 100 MHz, fM =1 kHz, ØD =50°)

   

Modulation bandwidth

500 kHz (fc ≤ 62.5 MHz (SG382 & SG384), fc ≤ 93.75 MHz (SG386))
100 kHz (fc > 62.5 MHz (SG382 & SG384), fc > 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 (fc < 1 GHz)
40 dB (1 GHz ≤ fc< 4 GHz)
35 dB (fc ≥ 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

    (fc > 62.5 MHz)

300 fs rms (typical, 1 kHz to 5 MHz BW at 1 GHz)

   

     (fc ≤ 62.5 MHz)

<10-4 U.I. (1 kHz to 5 MHz or fc/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 (fc/2)

<-25 dBc (fC < 6.5 GHz)
<-12 dBc (fC < 8.1 GHz)

   

Mixing products (3fc/2)

<-20 dBc

   

Harmonics (n x fc)

<-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

   

 

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