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Vector Signal Generators SG390 Series ... from $5400
SG390 Series Up to 6 GHz vector signal generators
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SG390 Series Vector Signal Generators
  • 2 GHz, 4 GHz and 6 GHz models
  • Dual baseband arb generators
  • Analog and vector modulation
  • I/Q modulation inputs (300 MHz RF BW)
  • ASK, FSK, MSK, PSK, QAM, VSB & custom I/Q
  • Presets for GSM, EDGE, W-CDMA, APCO-25, DECT, NADC, PDC, ATSC-DTV and TETRA
  • GPIB, RS-232 and Ethernet interfaces

Introducing the new SG390 Series Vector Signal Generators — high performance, affordable RF sources. Three new RF Signal Generators, with carrier frequencies from DC to 2.025 GHz, 4.050 GHz and 6.075 GHz, support both analog and vector modulation. The instruments utilize a new RF synthesis technique which provides spur free outputs with low phase noise (–116 dBc/Hz at 1 GHz) and extraordinary frequency resolution (1 μHz at any frequency). Both analog modulation and vector baseband generators are included as standard features.

 

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SG390 Series Vector Signal Generators

Introducing the new SG390 Series Vector Signal Generators — high performance, affordable RF sources. Three new RF Signal Generators, with carrier frequencies from DC to 2.025 GHz, 4.050 GHz and 6.075 GHz, support both analog and vector modulation. The instruments utilize a new RF synthesis technique which provides spur free outputs with low phase noise (–116 dBc/Hz at 1 GHz) and
extraordinary frequency resolution (1 μHz at any frequency). Both analog modulation and vector baseband generators are included as standard features.

The instruments use an ovenized SC-cut oscillator as the standard timebase, providing a 100 fold improvement in the stability (and a 100 fold reduction in the in-close phase noise) compared to instruments which use a TCXO timebase.

A New Frequency Synthesis Technique

The SG390 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 controlled 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.

Analog Modulation

The SG390 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 SG390 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.

Vector Modulation

The SG390 series builds upon this performance by adding full support for vector signal modulation on RF carriers between 400 MHz and 6.075 GHz. It features a dual, arbitrary waveform generator operating at 125 MHz for baseband signal generation. The generator has built-in support for the most common vector modulation schemes: ASK, QPSK, DQPSK, π/4 DQPSK, 8PSK, FSK, CPM. QAM (4 to 256), 8VSB, and 16VSB. It also includes built-in support for all the standard pulse shaping filters used in digital communications: raised cosine, root-raised cosine, Gaussian, rectangular, triangular, and more. Lastly, it provides direct support for the controlled injection of additive white Gaussian noise (AWGN) into the signal path.

Internal baseband generators

Using a novel architecture for I/Q modulation, the SG390 series provides quick, user-friendly waveform generation. The baseband generator supports the playback of pure digital data. It automatically maps digital symbols into a selected I/Q constellation at symbol rates of up to 6 MHz and passes the result through the selected pulse shaping filter to generate a final waveform updated in real time at 125 MHz. This baseband signal is then modulated onto an RF carrier using standard IQ modulation techniques.

Preset communications protocols (GSM, GSM EDGE, W-CDMA, APCO-25, DECT, NADC, PDC, TETRA, and ATSC DTV) quickly configure the signal generator to the correct modulation type, symbol data rates, TDMA duty cycles and digital waveform filters. The preset protocols also configure the rear-panel TDMA, START of FRAME, and SYMBOL CLOCK digital outputs. The baseband generators can be configured for these protocols without the use of external computers or third party software.

The I/Q waveforms are computed in real time. Symbols are mapped to constellations, digitally filtered, and up-sampled to 125 Msps to drive the I/Q modulator via dual 14-bit DACs. The symbols can be a fixed pattern, PRBS data from an internal source, or come from a downloaded user list of up to 16 Mbits. The constellation mapping can be modified by the user. Digital filters include Nyquist, root Nyquist, Gaussian, rectangular, linear, sinc, and user-defined FIR.

External I/Q Modulation

The rear-panel BNC I/Q modulation inputs and outputs enable arbitrary vector modulation via an external source. The external signal path supports more than 300 MHz of bandwidth with a full scale range of ±0.5 V and a 50 Ω input impedance.

Power vs Frequency

All SRS RF signal generators have cascaded stages of amplifiers and digital attenuators to drive the RF output. Five stages can provide up to +25 dB of gain to -130 dB of attenuation in 156 digitally controlled steps. During factory calibration the output power is measured at 32 frequencies per octave for each of the 156 attenuator steps to populate a memory matrix with about 40,000 elements. When set to a particular frequency and power, the instrument interpolates between these matrix elements to determine the best attenuator setting. An analog attenuator is used to provide 0.01 dB resolution between matrix elements and to compensate for residual thermal effects.

This method eliminates the need for precision attenuators and automatic level controls (ALC) without any sacrifice in performance. Eliminating the ALC also removes its unwanted interactions with amplitude, pulse and I/Q modulation.

OCXO or Rubidium Timebase

The SG390 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. An external 10 MHz timebase reference may be supplied to the rear-panel timebase input.

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.

 

 

 

SG380

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

SG390 Series Analog Specifications
Frequency Setting
Frequency ranges DC to 62.5 MHz (BNC output, all models)
     SG392 950 kHz to 2.025 GHz (N-type output)
     SG394 950 kHz to 4.05 GHz (N-type output)
     SG396 950 kHz to 6.075 GHz (N-type output)
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
     SG392 950 kHz to 2.025 GHz
     SG394 950 kHz to 4.05 GHz
     SG396 950 kHz to 6.075 GHz
Power output
     SG392 +16.5 dBm to -110 dBm
     SG394 +16.5 dBm to -110 dBm (<3 GHz)
     SG396 +16.5 dBm to -110 dBm (<4 GHz)
Voltage output
     SG392 1.5 Vrms to 0.7 µVrms
     SG394 1.5 Vrms to 0.7 µVrms (<3 GHz)
     SG396 1.5 Vrms to 0.7 µVrms (<4 GHz)
Power resolution 0.01 dBm
Power accuracy ±1 dB (±2 dB above 4 GHz and above +5 dBm or below -100 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 (SG392 & SG394), -114 dBc/Hz (SG396)
    1 MHz offset -130 dBc/Hz (SG392 & SG394), -124 dBc/Hz (SG396)
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 6.075 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)
Output Power Error
SG392 power error -30 dBm to +10 dBm, DC to 2 GHz
SG394 power error -30 dBm to +10 dBm, DC to 4 GHz
SG396 power error -30 dBm to +10 dBm, DC to 6 GHz
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 (SG392 & SG394),
                               fc ≤ 93.75 MHz (SG396))
1 µHz to 50 k Hz (fc > 62.5 MHz (SG392 & SG394),
                             fc > 93.75 MHz (SG396))
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
      SG392 & SG394
         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 (SG394) 32 MHz
      SG396
         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 (SG394) 32 MHz
Deviation resolution 0.1 Hz
Deviation accuracy <0.1 % (fc ≤ 62.5 MHz (SG392 & SG394), fc ≤ 93.75 MHz (SG396))
<3 % (fc > 62.5 MHz (SG392 & SG394), fc > 93.75 MHz (SG396))
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 (SG392 & SG394), fc ≤ 93.75 MHz (SG396))
  100 kHz (fc > 62.5 MHz (SG392 & SG394), fc > 93.75 MHz (SG396))
Frequency Sweeps (Phase Continuous)
Frequency span 10 Hz to entire sweep range
Sweep ranges
    SG392 & SG394

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 (SG394)

    SG396 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
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 (SG392 & SG394), fc ≤ 93.75 MHz (SG396))
<3 % (fc > 62.5 MHz (SG392 & SG394), fc > 93.75 MHz (SG396))
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 (SG392 & SG394), fc ≤ 93.75 MHz (SG396))
100 kHz (fc > 62.5 MHz (SG392 & SG394), fc > 93.75 MHz (SG396))
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
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
SG390 Series Vector Specifications
External I/Q Modulation
Carrier frequency range
     SG392 400 MHz to 2.025 GHz
     SG394 400 MHz to 4.05 GHz
     SG396 400 MHz to 6.075 GHz
I/Q inputs 50 Ω, ±0.5 V (rear panel)
I/Q full scale input √(I2 + Q2) = 0.5 V
Modulation bandwidth 300 MHz RF bandwidth
I or Q input offset <500 µV
Carrier suppression >40 dBc (>35 dBc above 4 GHz)
Dual Baseband Generator (for Vector I/Q Modulation)
Channels 2 (I and Q)
DAC data format Dual 14-bit at 125 MS/s
Reconstruction filter 10 MHz, 3rd order Bessel LPF
Arb symbol memory Up to 16 Mbits
Symbol rate 1 Hz to 6 MHz (1 µHz resolution)
Symbol length 1 to 9 bits (maps to constellation)
Symbol mapping Default or user-defined constellation
Symbol source User-defined symbols, built-in PRBS generator, or settable pattern generator
PRBS length 2n - 1 (5<n<32)
Pattern generator 16 bits
Digital filtering
    Filter type Nyquist, Root Nyquist, Gaussian, Rectangular, Linear, Sinc, User FIR
    Filter length 24 symbols
Noise impairments
    Additive noise White, Gaussian
    Level -70 dBc to -10 dBc (band limited by digital filter)
Vector Modulation
Modulation type PSK, QAM, FSK, CPM, MSK, ASK, VSB
     PSK derivatives PSK, BPSK, QPSK, OQPSK, DQPSK, π/4DQPSK, 8 PSK, 16 PSK, 3π/8 8 PSK
     QAM derivatives 4, 16, 32, 64, 256
     FSK derivatives 1-bit to 4-bit with deviations from 0 to 6 MHz
     ASK derivatives 1-bit to 4-bit
     CMP derivatives 1-bit to 4-bit with modulation indices from 0 to 1.0
      VSB derivatives 8 and 16 (at rates to 12 MS/s)
Preset modes GSM, GSM-EDGE, W-CDMA, APCO-25, DECT, NADC, PDC, TETRA, ATSC DTV, audio clip
Rear-Panel Markers
Type Symbol Clock, Data Frame, TDMA, and user-defined
Amplitude 0.5 to 4 Vpp (-2 dBm to +16 dBm)
Output impedance 50 Ω, AC coupled
EVM or FSK Errors
TETRA (π/4 DQPSK, 24.3 kS/s, 420 MHz, 0 dBm)
     0.76 % EVM (typ)
 
 
 
 
 
 
 
NADC (π/4 DQPSK, 24.3 kS/s, 875 MHz, 0 dBm)
     0.33 % EVM (typ)
 
 
 
 
 
 
 
APCO-25 (FSK4-C4FM, 4.8 kS/s, 850 MHz, 0 dBm)
     0.46 % EVM (typ)
 
 
 
 
 
 
 
DECT (FSK2, 1.152 Mbps, 1.925 GHz)
     1.5 % FSK error (typ.)
 
 
 
 
 
 
 
GSM (GMSK, 270.833 kS/s, 935 MHz, 0 dBm)
     0.3 % EVM (typ)
GSM (GMSK, 270.833 kS/s, 1.932 GHz, 0 dBm)
      0.6 % EVM (typ)
 
 
 
 
 
 
 
GSM-EDGE (3π/8 8PSK, 270.833 kS/s, 935 MHz, 0 dBm)
     0.3 % EVM (typ)
GSM-EDGE (3π/8 8PSK, 270.833 kS/s, 1.932 GHz, 0 dBm)
     0.5 % EVM (typ)
 
 
 
 
 
W-CDMA (QPSK, 3.840 Mcps, 1.850 GHz, 0 dBm)
     1.7 % EVM (typ)
 
 
 
 
 
 
 
QAM256 (6 MS/s, 2.450 GHz, 0 dBm)
     1.1 % EVM (typ)
 
 
 
 
 
 
 
QAM32 (6 MS/s, 5.800 GHz, 0 dBm)
     2.5 % EVM (typ)
 
 
 
 
 
 
 
ATSC-DTV (8 VSB, 10.762 MS/s, 695 MHz, 0 dBm)
     2.2 % EVM (typ)
 
 
 
 
 
 
 
 
 
 
 
 
 
Phone: (408)744-9040 • Fax: (408)744-9049 • email: info@thinkSRS.comwww.thinkSRS.com