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· DC to 4.05GHz
· 1μHz resolution
· AM, FM, ΦM, PM and sweeps
· OCXO timebase (std.)
· −116dBc/Hz SSB phase noise(20kHz offset, f=1GHz)
· Rubidium timebase (opt.)
· Square wave clock outputs (opt.)
· Analog I/Q inputs (opt.)
· Ethernet, GPIB, and RS-232 |
SRS最新设计的SG384—4 GHz射频信号发生器是一个高性能，价格适中的射频源。
该SG384采用独特的，创新的架构（频率合成），可提供超高频分辨率（1μHz），出色的相位噪声，多功能调制功能（调幅，调频，ΦM，脉冲调制和扫描）在一个相互竞争的设计的成本一小部分。
Specifications
Frequency Setting
Frequency ranges DC to 62.5 MHz (BNC output)
950 kHz to 4.05 GHz (N-type output)
4.05 GHz to 8.1 GHz (opt. 2, rear panel)
Frequency resolution 1 µHz at any frequency
Switching speed <8 ms (to within 1 ppm)
Frequency error <(10-18 + timebase error) × fc
Frequency stability <1×10-11 (1 s Allan variance)
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 ±1.41 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 950 kHz to 4.05 GHz
Power output +13 dBm to -110 dBm
Voltage output 1 Vrms to 0.7 µVrms
Power resolution 0.01 dBm
Power accuracy ±1 dB
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 <-65 dBc <10 kHz offset
Spurious <-75 dBc >10 kHz offset
Phase noise -80 dBc/Hz (typ.) 10 Hz offset
Phase noise -102 dBc/Hz (typ.) 1 kHz offset
Phase noise -116 dBc/Hz (typ.) 20 kHz offset
Phase noise -130 dBc/Hz (typ.) 1 MHz offset
Residual FM 1 Hz rms (typ.) 300 Hz to 3 kHz bandwidth
Residual AM 0.006 % rms (typ.) 300 Hz to 3 kHz bandwidth
* Spurs, phase noise and residual FM scale by 6 dB/octave to other carrier frequencies
Phase Setting of 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)
1 µHz to 50 k Hz (fc > 62.5 MHz)
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 (200 + 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
Connector Rear-panel BNC
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 kHz
Input offset <500 µV
Pulse/Blank threshold +1 VDC
Connector Rear-panel BNC
Amplitude Modulation
Range 0 to 100 % (decreases above +7 dBm output)
Resolution 0.1 %
Modulation source Internal or external
Modulation distortion <0.1 % (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 10 Hz to 1 MHz
Deviation resolution Larger of 1 Hz or 0.1 % of deviation
Deviation accuracy <0.1 % (fc < 62.5 MHz), <3 % (fc > 62.5 MHz)
Modulation source Internal or external
Modulation distortion <-70 dB (fc = 1 GHz, fM = 20 kHz, fD = 20 kHz)
Ext FM carrier offset <1:1,000 of deviation
Modulation bandwidth >100 kHz
Frequency Sweeps (Phase Continuous)
Frequency span 10 Hz to entire sweep range
Sweep ranges DC to 62.5 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
3800 to 8200 MHz (opt. 02 only)
Deviation resolution Larger of 1 Hz or 0.1 % of deviation
Sweep source Internal or external
Sweep distortion <0.1 Hz + deviation/1,000
Sweep offset <1:1,000 of deviation
Sweep function Triangle or ramp 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), <3 % (fc > 62.5 MHz)
Modulation source Internal or external
Modulation distortion <-70 dB (fc = 1 GHz, fM = 20 kHz, ØD = 90°)
Modulation bandwidth >100 kHz
Pulse/Blank Modulation
Pulse mode Logic "high" turns RF "on"
Blank mode Logic "high" turns RF "off"
On/Off ratio 40 dB (1 to 4 GHz)
60 dB (0.1 to 1 GHz)
75 dB (DC to 100 MHz)
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 4.05 GHz
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
Modulation bandwidth 200 MHz
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 (1 kHz to 5 MHz bandwidth)
Jitter (fc < 62.5 MHz) <10-4 U.I. rms (1 kHz to 5 MHz bandwidth)
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
RF Doubler Output (opt. 02)
Output Rear-panel SMA
Frequency range 4.05 GHz to 8.10 GHz
RF amplitude -15 dBm to +7 dBm
Sub harmonic (fc/2) <-25 dBc
Mixing products (3fc/2) <-25 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
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