Vector Signal Generators SG390 Series — DC to 2 GHz, 4 GHz and 6 GHz vector signal generators Stanford Research Systems, Inc. Model SG396 DC to 6.05 GHz Vector Signal Generator # ANALOG . VECTOR PRESETS ADD. NOISE EVENTS EmOD or EN8W PULSE WIDTH or Dim • Vector and analog modulation • Presets for GSM, EDGE, W-CDMA, APCO-2S, DECT, NADC, PDC, ATSC- • GPIB, RS-232 & Ethernet interfaces 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 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 GEfz) and extraordinary frequency resolution (1 uFfz 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) Stanford Research Systems

SG390 Series Vector Signal Generators 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...

SG390 Series Vector Signal Generators Easy Communication 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....

SG390 Series Specifications (Analog) Frequency Setting Frequency ranges SG392 SG394 SG396 Frequency resolution Switching speed Frequency error Frequency stability DC to 62.5 MHz (BNC output, all models) 950 kHz to 2.025 GHz (N-type output) 950 kHz to 4.05 GHz (N-type output) 4.05 GHz to 8.1 GHz (w/ Opt. 02) 950 kHz to 6.075 GHz (N-type output) 6.075 GHz to 8.1 GHz (w/ Opt. 02) 1 µHz at any frequency <8 ms (to within 1 ppm) <(10–18 + timebase error) × fC 1 × 10–11 (1 s Allan variance) 1 MHz offset Residual FM (typ.) Residual AM (typ.) * Spurs, phase noise and residual FM scale by 6 dB/octave to...

SG390 Series Specifications (Analog) Oscillator type Physics package Timebase Input Input impedance Timebase Output Output Power Error Oven controlled, 3rd OT, SC-cut crystal Rubidium vapor frequency discriminator SG392 Output Power Error vs. Frequency SG394 Output Power Error vs. Frequency SG396 Output Power Error vs. Frequency Internal Modulation Source Ramp linearity Rate resolution Rate error Noise function Noise bandwidth Pulse generator period Pulse generator width Pulse timing resolution Pulse noise function Sine, ramp, saw, square, pulse, noise White Gaussian noise (rms = dev/ 5) Modulation...

SG390 Series Specifications (Analog) Amplitude Modulation Range Resolution Modulation source Modulation distortion BNC output N-type output Modulation bandwidth 0 to 100 % (decreases above +7 dBm) 0.1 % Internal or external <1 % (fC < 62.5 MHz, fM = 1 kHz) <3 % (fC > 62.5 MHz, fM = 1 kHz) >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 ≤ 253.125 MHz 2 MHz 253.125 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...

SG390 Series Specifications (Vector) Vector Modulation Carrier frequency range 400 MHz to 2.025 GHz (SG392) 400 MHz to 4.05 GHz (SG394) 400 MHz to 6.075 GHz (SG396) I/Q inputs 50 Ω, ±0.5 V (rear panel) I/Q full scale input (I2 + Q2)1/2 = 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) Modulation type PSK derivatives QAM derivatives FSK derivatives ASK derivatives CMP derivatives VSB derivatives Preset modes PSK, QAM, FSK, CPM, MSK, ASK, VSB PSK, BPSK, QPSK, OQPSK, DQPSK, π/4DQPSK, 8 PSK, 16 PSK, 3π/8 8 PSK 4, 16, 32,...

SG390 Series Specifications (Vector) NADC constellation NADC I-Eye diagram I-Eye diagram each symbol DECT constellation DECT PEye diagram each symbol SRS Stanford Research Systems

SG390 Series Specifications (Vector) Amplitude Droop (142 syms): RMPH Offset:--- I/Q Measured Polar Vector GSM-EDGE constellation lagnitude Error: active Channels: 7 Slot* IE Stanford Research Systems