Stanford Research CG635 Clock Generator – 2 GHz
Stanford Research Systems RF Signal Sources. Frequency range: 1 µHz to 2.05 GHz, Resolution: 16 digits (≥10 kHz), Accuracy: Δf <.
- Model
- Stanford Research Systems CG635
- Calibration
- Available on request
- Price
- $4,359
- Status
- In stock
- RFQ ref
- CG635
This unit
The Stanford Research Systems CG635 is a synthesized square wave clock generator delivering frequencies from 1 µHz to 2.05 GHz with exceptional timing precision. Built for digital component development, system characterization, and network testing, it combines sub-picosecond jitter, multiple output formats, and flexible timebase options to meet demanding metrology and RF applications.
Technical Specifications
Frequency Performance- Frequency range: 1 µHz to 2.05 GHz
- Frequency resolution: 16 digits (≥10 kHz); 1 pHz (<10 kHz)
- Frequency accuracy: Δf < ±(2 × 10⁻¹⁹ + timebase error) × f
- Settling time: <30 ms
- Jitter (random): <1 ps rms
- Rise/fall transition time: 80 ps
- Phase noise: <-80 dBc/Hz at 100 Hz offset (622.08 MHz carrier)
- Spurious response: Better than -70 dBc Timebase Options
- Standard: 10 MHz crystal-controlled, <5 ppm stability
- Optional OCXO: <0.01 ppm stability
- Optional Rubidium: 200 MHz); 10× finer per decade below, maximum one nano-degree
- Time modulation range: ±5 ns
- Time modulation input sensitivity: 1 ns/V
- Time modulation bandwidth: DC to >10 kHz
Key Features
- Complementary square wave outputs with continuously adjustable amplitude and offset
- Low-jitter architecture suitable for precision clock distribution and RF signal generation
- Differential outputs drive 50 Ω terminated loads; single-ended levels double when unterminated
- Rear-panel CAT-6 shielded cable compatibility with 100 Ω terminations
- Optional PRBS generator (Option 01) with complementary LVDS for eye-pattern testing
Typical Applications
- High-speed digital component and system characterization
- Precision timing for network synchronization and RF test benches
- Clock generation for signal acquisition and data converter testing
- Phase-locked operation to external atomic standards
Compatibility & Integration Optional line receivers (CG640–CG649 series) accept power from rear-panel RJ-45 connector. PRBS outputs available on SMA connectors via Option 01.
Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 1 µHz to 2.05 GHz | Power Range (dBm): '+7 dBm RF output | Voltage / Current Range: Amplitude: 0.2 V to 1.0 V |
| Offset | -2 V to +5 V |
| Auxiliary power | ±5 VDC |
Stanford Research Systems CG635 — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Stanford Research Systems CG635. Calibration covers output frequency accuracy, output power level accuracy across the full frequency range, AM/FM/PM/pulse modulation accuracy, harmonic and spurious output levels, and phase noise floor verification. All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Stanford Research Systems CG635 faults: YIG oscillator failure (no output or loss of lock), step attenuator wear (output drops or steps at set attenuation), ALC loop failure (uncontrolled output power), I/Q modulator assembly failure. HP/Agilent 836xx series most common faults are YIG oscillator failure and step attenuator contact wear causing output steps or drops at specific attenuation settings. Keysight E4428C/E4438C units most commonly develop ALC loop failure and I/Q modulator assembly faults. YIG oscillator replacement and attenuator service are stocked repairs.
Stanford Research Systems CG635 price
This Stanford Research Systems CG635 is listed at $4,359. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Stanford Research Systems CG635 calibration cost
NIST-traceable calibration for the Stanford Research Systems CG635 is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers output frequency accuracy, output power level accuracy across the full frequency range, AM/FM/PM/pulse modulation accuracy, harmonic and spurious output levels, and phase noise floor verification. Turnaround is 1 to 3 business days after receipt. See full calibration details →
