Stanford Research Systems CG635 Gerador de Relógio Sintetizado
Stanford Research Systems CG635 Synthesized Clock Generator
Stanford Research Systems CG635 gera ondas quadradas de relógio extremamente estáveis de 1 µHz a 2,05 GHz com resolução de frequência de 16 dígitos, tempos de subida de 80 ps e múltiplos formatos de saída para precisão ...
Detalhes do produto
| Modelo | CG635 |
| Fabricante | Stanford Research Systems |
| Categoria | Geradores de Sinal RF e Micro-ondas |
| Disponibilidade | Por encomenda |
Descrição
Visão Geral
O Stanford Research Systems CG635 é um gerador de relógio sintetizado de alto desempenho que produz ondas quadradas extremamente estáveis entre 1 µHz e 2,05 GHz. Com resolução de frequência de 16 dígitos e jitter ultra-baixo, o CG635 é ideal para aplicações que requerem relógios limpos e precisos—desde testes de ADC/DAC de alta velocidade até caracterização de componentes RF. Os níveis de saída flexíveis do instrumento e os recursos de modulação o tornam essencial para validar o desempenho do sistema digital com fontes de relógio ideais.
Características Principais
- Faixa de frequência: 1 µHz a 2,05 GHz com resolução de 16 dígitos
- Tempos de subida e descida: 80 ps
- Múltiplos formatos de saída: CMOS, PECL, ECL, LVDS, RS-485
- Controle de fase com resolução de até um nano-grau
- Modulação de tempo: ±5 ns via entrada do painel traseiro
- PRBS opcional para teste de padrão de olho
- Bases de tempo OCXO (cristal controlado por forno) e rubídio opcionais para estabilidade melhorada
- Entrada de sincronização de fase de 10 MHz para sincronização com referências externas
- Minimização de ruído de fase de baixa frequência com bases de tempo opcionais
Aplicações
- Testes e caracterização de ADC e DAC de alta velocidade
- Medições de jitter de relógio e suscetibilidade de modulação
- Desenvolvimento de componentes de misturador RF e processamento de sinal
- Testes e validação de sistemas digitais e redes
- Temporização de precisão para ambientes de laboratório e teste
- Sincronização de relógio em sistemas multi-instrumentos
Especificações
| 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 Gerador de Relógio Sintetizado