본 상품은 단종으로 렌탈 및 중고판매 상품입니다.

구입 및 렌탈서비스 상담 010-4221-0660

CG635는 1μHz ~ 2.05GHz 사이의 매우 안정된 구형파 클럭을 생성합니다. 이 장비의 고주파 해상도, 낮은 지터, 빠른 전환 시간 및 유연한 출력 레벨은 사실상 모든 디지털 구성 요소, 시스템 또는 네트워크의 개발 및 테스트에 이상적입니다.

클록 클록은 고속 ADC 또는 DAC를 사용하는 시스템에서 중요합니다. 스퓨리어스 클럭 변조 및 지터는 수집 된 신호 및 재구성 된 파형의 아티팩트 및 노이즈를 생성합니다 

The CG635 generates extremely stable square wave clocks between 1 µHz and 2.05 GHz. The instrument's high frequency resolution, low jitter, fast transition times, and flexible output levels make digital component, system or network.

Clean clocks are critical in systems that use high-speed ADCs or DACs. Spurious clock modulation and jitter create artifacts and noise in acquired signals and in reconstructed waveforms. Clean clocks are also important in communications systems and networks. Jitter, wander, or frequency offsets can lead to high bit error rates, or to a total loss of synchronization. The CG635 can provide the clean, stable clocks required for the most critical applications.

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.

Clock and PRBS Signals at 622.08 MHz

Optional Line Receivers

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.

RF Spectrum of a 100 MHz Clock

Phase Noise for 622.08 MHz and 10 MHz Outputs

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.