Stanford Research Systems CG635 Syntetiserad Clock Generator
Stanford Research Systems CG635 Synthesized Clock Generator
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Stanford Research Systems CG635 genererar extremt stabila kvadratiska klocksignaler från 1 µHz till 2.05 GHz med 16-siffrig frekvenslösning, 80 ps stigtider och flera utdataformat för precisions...
Produktinformation
| Modell | CG635 |
| Tillverkare | Stanford Research Systems |
| Kategori | RF- och mikrovågssignalgeneratorer |
| Tillgänglighet | Tillverkas på beställning |
Beskrivning
Översikt
Stanford Research Systems CG635 är en högpresterande syntetiserad clock generator som producerar extremt stabila kvadratiska vågor mellan 1 µHz och 2.05 GHz. Med 16-siffrig frekvenslösning och ultralåg jitter är CG635 idealisk för tillämpningar som kräver rena, precisa klocksignaler—från höghastigade ADC/DAC-testning till RF-komponentkarakterisering. Instrumentets flexibla utdatanivåer och moduleringsmöjligheter gör det väsentligt för validering av digital systemprestation med ideala klockkällor.
Viktiga funktioner
- Frekvensintervall: 1 µHz till 2.05 GHz med 16-siffrig lösning
- Stigtider och fallningstider: 80 ps
- Flera utdataformat: CMOS, PECL, ECL, LVDS, RS-485
- Faskontroll med upp till nano-grads lösning
- Tidsmodulering: ±5 ns via bakre paneleinmatning
- Valfri PRBS för ögonmönstertestning
- Valfri OCXO (ugnscontrollerad kristall) och rubidum tidsunderlag för förbättrad stabilitet
- 10 MHz fas-lås-inmatning för synkronisering med externa referenser
- Låg frekvens fasbrus minimering med valfria tidsunderlag
Tillämpningar
- Höghastigade ADC och DAC testning och karakterisering
- Klocka jitter och moduleringsöverkänslighetsmätningar
- RF-blandare och signalbehandlingskomponentutveckling
- Digitalt system och nätverk testning och validering
- Precisionstiming för laboratorium- och testmiljöer
- Klockssynkronisering i multi-instrumentsystem
Specifikationer
| 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 Syntetiserad Clock Generator
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