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RF Signal Generators SG380 Series ... from $3900
SG380 Series Up to 6 GHz signal generators
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SG380 Series RF Signal Generators
  • DC to 2 GHz, 4 GHz or 6 GHz
  • 1 µHz resolution
  • AM, FM, ØM, PM and sweeps
  • OCXO timebase (std.)
  • -116 dBc/Hz phase noise
    (20 kHz offset, f = 1 GHz)
  • Rubidium timebase
  • Square wave clock outputs
  • Analog I/Q inputs
  • Ethernet, GPIB and RS-232
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, 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).

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SG380 Series RF Signal Generators

Introducing 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, 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).

On the Front Panel

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 Ω 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 Ω load.

Modulation

The 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 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.

Square Wave Clock 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.

 I/Q 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.

Output Frequency Doubler

The 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 Communication

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.

A New Frequency Synthesis Technique

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

Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.comwww.thinkSRS.com

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
 
 
 
 
 
Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.comwww.thinkSRS.com