The BI401 Clock and Frequency Generator provides extremely accurate and stable square wave clock signals at up to 4.1GHz. Option -2G goes up to 2.1GHz, while -4G goes up to 4.1GHz. You can set the frequency with an unmatched resolution of 20 digits, and the jitter is below 0.3ps regardless of the frequency. There are two outputs – one single ended which provides up to 6Vpk-pk at 300MHz, and one differential with up to 1Vpk-pk at the full frequency range. The minimum frequency is 1µHz (one cycle in more than 11 days) and you can also output DC levels with 1mV accuracy. The instrument includes a high performance timebase and can serve as an excellent frequency reference for the whole system with very low phase noise. Both sine waves and square waves are available on the reference outputs.
Ultra-Low Phase Noise and Jitter
Using advanced synthesizer technology, this instrument produces clock signals with very low phase noise. The time domain jitter is less than 0.3ps regardless of frequency. This is in direct contrast to sinewave generators (RF generators) whose jitter increases at low frequencies. For example, if you use a 2Vpk-pk 10MHz sinewave as a system clock, its slew rate is 62.8V/µs or 62.8mV/ns. Therefore, 1mv of noise will add 16ps of jitter. If this signal is a sampling clock for a 14-bit ADC, the ADC will be degraded significantly. Since the output of the BI401 is a square wave whose slew rate is the same for all frequencies, there is no added jitter at low frequencies.
BI401 Virtual Front Panel Software
Actual phase noise measurements at 10 MHz, 622.08 MHz, and 1 GHz (spur were not removed)
|Frequency range||BI401-2G: 1µHz to 2.1GHz, plus DC; BI401-4G: 1µHz to 4.1GHz, plus DC|
|Switching time||< 250µs|
|Jitter||< 0.3ps rms (1kHz to 10MHz bandwidth)|
|Wander||< 10ps (10s persistence)|
|Brand||Carmel Instruments LLC|