Stanford Research Systems CG635 Gesynthetiseerde Klokgenerator
Stanford Research Systems CG635 Synthesized Clock Generator
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Stanford Research Systems CG635 genereert uiterst stabiele blokgolven van 1 µHz tot 2,05 GHz met 16-cijferige frequentieresolutie, 80 ps stijgtijden en meerdere uitvoerformaten voor nauwkeurigheid...
Productdetails
| Model | CG635 |
| Fabrikant | Stanford Research Systems |
| Categorie | RF- en microgolfsignaalvormers |
| Beschikbaarheid | Op bestelling |
Beschrijving
Overzicht
De Stanford Research Systems CG635 is een krachtige gesynthetiseerde klokgenerator die uiterst stabiele blokgolven produceert tussen 1 µHz en 2,05 GHz. Met 16-cijferige frequentieresolutie en ultralage jitter is de CG635 ideaal voor toepassingen die schone, nauwkeurige klokken vereisen—van snelle ADC/DAC-testen tot RF-onderdeel karakterisering. De flexibele uitvoerniveaus van het instrument en modulatiemogelijkheden maken het essentieel voor het valideren van digitale systeemprestaties met ideale klokbronnen.
Belangrijkste functies
- Frequentiebereik: 1 µHz tot 2,05 GHz met 16-cijferige resolutie
- Stijg- en daltijden: 80 ps
- Meerdere uitvoerformaten: CMOS, PECL, ECL, LVDS, RS-485
- Fasebediening met tot één nano-gradige resolutie
- Tijdmodulatie: ±5 ns via ingang aan achterkant
- Optioneel PRBS voor eye-pattern-testen
- Optionele OCXO (ovengestuurde kristal) en rubidium-tijdbases voor verbeterde stabiliteit
- 10 MHz fasevergrendeling-ingang voor synchronisatie met externe referenties
- Minimalisering van laagfrequent fasruis met optionele tijdbases
Toepassingen
- Snelle ADC- en DAC-testen en karakterisering
- Klokjitter- en modulatiebeveiligingsmetingen
- RF-mixer en signaalverwerkingsonderdeel ontwikkeling
- Digitaal systeem- en netwerktesten en validatie
- Nauwkeurige timing voor laboratorium- en testomgevingen
- Kloksynchronisatie in multi-instrument systemen
Specificaties
| Output Drivers | The CG635 has several clock outputs. The front-panel Q and -Q outputs provide complementary square waves at standard logic levels (ECL, PECL, LVDS or +7 dBm). The square wave amplitude may also be set from 0.2 V to 1.0 V, with an offset between -2 V and +5 V. These outputs operate from DC to 2.05 GHz, have transition times of 80 ps, a source impedance of 50 Ω, and are intended to drive 50 Ω loads. Output levels double when these outputs are unterminated. The front-panel CMOS output provides square waves at standard logic levels. The output may also be set to any amplitude from 0.5 V to 6.0 V. The CMOS output has transition times of less than 1 ns and operates up to 250 MHz. It has a 50 Ω source impedance and is intended to drive high impedance loads at the end of any length of 50 Ω coax cable. A rear-panel RJ-45 connector provides differential square wave clocks on twisted pairs at RS-485 levels (up to 105 MHz) and LVDS levels (up to 2.05 GHz). This output also provides ±5 VDC power for optional line receivers (CG640 to CG649). The clock outputs have 100 Ω source impedances and are intended to drive shielded CAT-6 cable with 100 Ω terminations. The differential clocks may be used directly by the target system, or with optional line receivers that provide complementary logic outputs on SMA connectors. |
| Choice of Timebases | The standard crystal timebase has a stability of better than 5 ppm. The CG635's 10 MHz timebase input allows the instrument to be phase-locked to an external 10 MHz reference. The 10 MHz output may be used to lock two CG635s together. There are two optional timebases. An oven-controlled crystal oscillator (OCXO) provides about 100 times better frequency stability than the standard crystal oscillator. A rubidium frequency source provides about 10,000 times better stability. Either optional timebase will substantially reduce the low-frequency phase noise of the synthesized output. |
| Phase and Time Modulation | The clock phase can be adjusted with high precision. The phase resolution is one degree for frequencies above 200 MHz, and increases by a factor of ten for each decade below 200 MHz, with a maximum resolution of one nano-degree. This allows clock edges to be positioned with a resolution of better than 14 ps at any frequency between 0.2 Hz and 2.05 GHz. The timing of clock edges can be modulated over ±5 ns via a rear-panel time-modulation input. The input has a sensitivity of 1 ns/V and a bandwidth from DC to over 10 kHz, allowing an analog signal to control the phase of the clock output. This feature is very useful for characterizing a system's susceptibility to clock modulation and jitter. |
| For Every Application | With its exceptionally low phase noise and high frequency resolution, the CG635 replaces RF signal generators in many applications. Front-panel outputs provide square waves up to +7 dBm—ideal for driving RF mixers. Should your application require sine waves, in-line low-pass filters are commercially available to convert the CG635's square wave outputs to low distortion sine wave outputs. The CG635 can provide a wide range of clean, precise clocks for the most critical timing requirements. The instrument is an essential tool for demonstrating a system's performance with a nearly ideal clock, and for understanding a system's susceptibility to a compromised clock. The CG635 has the frequency range, precision, stability, and jitter-free performance needed to fulfill all your clock requirements. |
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Stanford Research Systems CG635 Gesynthetiseerde Klokgenerator
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