Instruments, RF Signal Generator

SG380 Series - Up to 6 GHz signal generators

Stanford Research Systems

The SG380 Series RF Signal Generators use a unique, innovative architecture (Rational Approximation Frequency Synthesis) to deliver ultra-high frequency resolution (1 �Hz), excellent phase noise, and versatile modulation capabilities (AM, FM, ?M, 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).; Smaller of fc or (64 MHz - fc); 1 MHz; 126.5625 MHz 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386)); BNC output; Type-N output; 57 dB (fc 40 dB (1 GHz � fc 35 dB (fc � 4 GHz)SG380 Series RF Signal Generators DC to 2 GHz, 4 GHz or 6 GHz 1 �Hz resolution AM, FM, ?M, 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-232Features Specifications 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 �Hz), excellent phase noise, and versatile modulation capabilities (AM, FM, ?M, 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 Phase Noise Amplitude Modulation 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 +16.5 dBm to -110 dBm (amplitude from 1 Vrms to 0.707 �Vrms) into a 50 ? load. Modulation The SG380 Signal Generators offer a wide variety of modulation capabilities. Modes include amplitude modulation (AM), frequency modulation (FM), phase modulation (�M), 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. Frequency Modulation 1 GHz Spectra 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. Frequency Shift Keying (FSK) Pulse Modulation 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. Noise Spectra I/Q Noise Modulation Polar Plot 1 Clock Outputs Polar Plot 2 Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com SG380 Series RF Signal GeneratorsSG380 Series RF Signal Generators Frequency SettingFrequency 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 Frequency resolution 1 �Hz at any frequency Switching speed Frequency error Front-Panel BNC OutputFront-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 Amplitude accuracy �5 % Harmonics Spurious Output coupling DC, 50 � �2 % User load 50 � Reverse protection �5 VDC Front-Panel N-Type Output Front-Panel N-Type Output Frequency range Frequency range SG382 950 kHz to 2.025 GHz SG384 950 kHz to 4.05 GHz SG386 950 kHz to 6.075 GHz Power outputPower output SG382 +16.5 dBm to -110 dBm SG384 +16.5 dBm to -110 dBm ( SG386 +16.5 dBm to -110 dBm ( Voltage outputVoltage output SG382 1.5 Vrms to 0.7 �Vrms SG384 1.5 Vrms to 0.7 �Vrms ( SG386 1.5 Vrms to 0.7 �Vrms ( Power resolution 0.01 dBm Power accuracy �1 dB (�2 dB above 4 GHz and +5 dBm) Output coupling AC, 50 ? User load 50 ? VSWR Reverse protection 30 VDC, +25 dBm RF Spectral Purity of the RF Output Referenced to 1 GHz* Spectral Purity of the RF Output Referenced to 1 GHz* Sub harmonics none (No doubler used below 4 GHz) Harmonics SpuriousSpuriousSpuriousSpurious >10 kHz offset Phase noise (typ.)Phase noise (typ.)Phase noise (typ.)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 * Spurs, phase noise and residual FM scale by 6 dB/octave to other carrier frequencies Phase Setting on Front-Panel Outputs 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 Standard OCXO Timebase Oscillator type Oven controlled, 3rd OT, SC-cut crystal Stability (0 to 45� C) Aging Rubidium Timebase (opt. 04) Rubidium Timebase (opt. 04) Oscillator type Oven controlled, 3rd OT, SC-cut crystal Physics package Rubidium vapor frequency discriminator Stability (0 to 45� C) Aging Timebase Input Timebase Input Frequency 10 MHz, �2 ppm Amplitude 0.5 to 4 Vpp (-2 dBm to +16 dBm) Input impedance 50 �, AC coupled Timebase Output Timebase Output Frequency 10 MHz, sine Source 50 �, DC transformer coupled Amplitude 1.75 Vpp �10 % (8.8 � 1 dBm) Internal Modulation Source Internal Modulation Source Waveforms Sine, ramp, saw, square, pulse, noise Sine THD -80 dBc (typical at 20 kHz) Ramp linearity Rate 1 �Hz to 500 k Hz (fc � 62.5 MHz (SG382 & SG384), fc � 93.75 MHz (SG386)) 1 �Hz to 50 k Hz (fc > 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386)) Rate resolution 1 �Hz Rate error Noise function White Gaussian noise (rms = dev/5) Noise bandwidth 1 �Hz Pulse generator period 1 �s 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 OutputModulation Waveform Output Output impedance 50 � (for reverse termination) User load Unterminated 50 � coax AM, FM, ?M �1 V for � full deviation Pulse/Blank "Low" = 0 V, "High" = 3.3 VDC External Modulation Input External Modulation Input Modes AM, FM, ?M, Pulse, Blank Unmodulated level 0 V input for unmodulated carrier AM, FM, ?M �1 V input for � full deviation Modulation bandwidth >100 kHz Modulation distortion Input impedance 100 k? Input offset Pulse/Blank threshold +1 VDC Amplitude Modulation Amplitude Modulation Range 0 to 100 % (decreases above +7 dBm output) Resolution 0.1 % Modulation source Internal or external Modulation distortion 62.5 MHz, fm = 1 kHz, N-type output) Modulation bandwidth >100 kHz Frequency Modulation Frequency Modulation Frequency deviation Frequency deviation Minimum 0.1 Hz Maximum Maximum SG382 & SG384 SG382 & SG384 fc Smaller of fc or (64 MHz - fc) 62.5 MHz 1 MHz 126.5625 MHz 2 MHz 253.1250 MHz 4 MHz 506.25 MHz 8 MHz 1.0125 GHz 16 MHz 2.025 GHz 32 MHz 4.050 GHz 64 MHz SG386 SG386 fc Smaller of fc or (96 MHz - fc) 93.75 MHz 1 MHz 189.84375 MHz 2 MHz 379.6875 MHz 4 MHz 759.375 MHz 8 MHz 1.51875 GHz 16 MHz 3.0375 GHz 32 MHz 6.075 GHz 64 MHz Deviation resolution 0.1 Hz Deviation accuracy 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386)) Modulation source Internal or external Modulation distortion Ext FM carrier offset 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 Sweeps (Phase Continuous) Frequency span 10 Hz to entire sweep range Sweep rangesSweep 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 Sweep offset Sweep function Triangle, ramp or sine sweeps up to 120 Hz Phase Modulation Phase Modulation Deviation 0 to 360� Deviation resolution 0.01� to 100 MHz, 0.1� to 1 GHz, 1� above 1 GHz Deviation accuracy Deviation accuracy 62.5 MHz (SG382 & SG384), fc > 93.75 MHz (SG386)) Modulation source Internal or external Modulation distortion 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/Blank Modulation Pulse mode Logic "high" turns RF "on" Blank mode Logic "high" turns RF "off" On/Off ratio On/Off ratio BNC output 70 dB Type-N output 57 dB (fc 40 dB (1 GHz � fc 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) 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 �, �0.5 V I or Q input offset 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)Square Wave Clock Outputs (opt. 01) Differential clocks Rear-panel SMAs drive 50 � loads Frequency range DC to 4.05 GHz Transition time JitterJitterJitterJitter (fc > 62.5 MHz) 300 fs rms (typical, 1 kHz to 5 MHz BW at 1 GHz) (fc � 62.5 MHz) Amplitude 0.4 to 1 Vpp Offset �2 VDC Ampl & Offs resolution 5 mV Ampl & Offs accuracy �5 % Output coupling DC, 50 � �2 % Compliance ECL, PECL, RSECL, CML, NIM & LVDS Frequency Doubler Output (opt. 02) 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) Mixing products (3fc/2) Harmonics (n x fc) Spurious (8 GHz) 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, ?M, Sweeps Output coupling AC, 50 � Reverse protection 30 VDC, +25 dBm RF DC Bias Source (comes with opt. 02) DC Bias Source (comes with opt. 02) Output Rear-panel SMA Voltage range �10 V Offset voltage DC accuracy �0.2 % DC resolution 5 mV Output resistance 50 � Current limit 20 mA Computer Interfaces (all are standard)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 GeneralGeneral Line power 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.com ? www.thinkSRS.com Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com Phone: (408)744-9040 ? Fax: (408)744-9049 ? email: info@thinkSRS.com ? www.thinkSRS.com