SHOP FOR
PicoSource PG900 Series

Differential picosecond pulse generators

PG911 and PG914

  • Integral 50 Ω SMA(f) Step Recovery Diode outputs
  • < 60 ps transition time
  • Dual 2.5 to 6 V variable amplitude outputs
  • ±1 ns in 1 ps steps timing deskew
  • 200 ns to 4 μs pulse width
  • 1 μs to 1 s internal clock period
  • ​< 3 ps RMS jitter relative to external trigger
  • –20 dB 10 GHz SMA(m-f) attenuator included with Step Recovery Diode outputs

PG912 and PG914

  • External 50 Ω N(m) positive and negative Tunnel Diode pulse heads
  • < 40 ps transition time
  • Dual > 200 mV fixed amplitude outputs
  • ​±200 ps in 1 ps steps timing deskew
  • Inter-series N(f) – SMA(m) adapter included with Tunnel Diode pulse heads

The fast-transition pulse can stimulate a transmission path, device or network with a broad spectrum signal in a single instant. Such a pulse is very useful for many of the high-speed broadband measurements that we need to make; for instance in time-domain reflectometry, semiconductor test, gigabit interconnect and port test and in radar.

Differential high-speed data in particular dominates the measurement challenge in our digital, computing, interconnect and telecommunications systems. Surprisingly, cost-effective fast-transition differential pulse generators have been very hard to find ... until now!

Typical applications include:

  • TDR/TDT network and match analysis
  • Spectral and flatness measurements
  • Timing, jitter and crosstalk determinations

A versatile, portable triggered differential USB pulse generator

The PicoSource PG900 Series are low-jitter triggered differential USB pulse generators. Pulse outputs are optimized for broad spectral content (fastest transition time) to best suit spectral and time-domain transmission and reflectometry measurements. An internal clock is provided for stand-alone, self-triggered operation and trigger input and output allow the generators to source or respond to system triggers. Differential outputs ensure that the proliferation of gigabit differential interconnect and systems can all be addressed (e.g. SATA, USB3, HDMI, Ethernet).

 

Essential to any differential test or measurement is the ability to adjust for small but significant velocity and path length differences that are bound to exist in any measurement setup. The PG900 pulse outputs can each be adjusted (time-skewed) in 1 ps increments to deskew path differences before the measurement, or to deliberately stress a transmission path with timing skew.

Despite their small size and portability the PicoSource PG900 generators pack quite a punch, with integrated Step Recovery Diode outputs of up to 6 V pk each into 50 Ω. That’s a whopping 12 V pk differential pulse amplitude to drive lossy paths or stress system ports. Outputs are adjustable in 10 mV steps down to 2.5 V pk. A user-settable amplitude limit is provided to protect more sensitive system ports and 20 dB attenuators are supplied fitted to the pulse outputs for small-signal and optimum-match applications.

 

Step Recovery variable amplitude pulse

The positive (fast rise) and negative (fast fall) pulses are both ground referenced and each pulses in opposite polarity to their user selected amplitude. This amplitude (the 'mark') is held for the user-selected pulse width and then returns to ground. Further pulses are prevented for the user set hold-off period and thereafter will repeat at 40 ns after the next received trigger. When the internal clock is selected, the pulse will repeat at the user-set period and holdoff is inactive. An output trigger is generated 40 ns before every pulse, however initiated.

Pulse transition time is typically 55 ps and spectral content (compared with a simulated ideal infinitely fast edge) extends to around 13 GHz @ –10 dB.

The negative (fast fall) pulse can be selected for even faster transition time by selecting 'fast' rather than 'smooth' mode. Pulse aberration is compromised but transition time is typically 45 ps and spectral content extends to around 14 GHz @ –10 dB.

Tunnel Diode Head fixed-amplitude pulse

The positive (fast rise) and negative (fast fall) pulses are both ground-referenced and each pulses in opposite polarity to its user-selected amplitude. This amplitude (the 'mark') is held for the user-selected pulse width and then returns to ground. Further pulses are prevented for the user-set holdoff period and thereafter will repeat at 40 ns after the next received trigger. When the internal clock is selected, the pulse will repeat at the user-set period and holdoff is inactive. An output trigger is generated 40 ns prior to every pulse, however initiated.

Pulse transition time is typically 55 ps and spectral content (compared with a simulated ideal infinitely fast edge) extends to around 13 GHz @ –10 dB.

The negative (fast fall) pulse can be selected for even faster transition time by selecting 'fast' rather than 'smooth' mode. Pulse aberration is compromised but transition time is typically 45 ps and spectral content extends to around 14 GHz @ –10 dB.

Features
  • 2.5 V to 6 V variable amplitude outputs
  • single-ended pulse transition time : < 60 ps for PG911 and < 40 ps for PG912
  • 200 ns to 4 μs pulse width
  • Adjustable 1 μs to 1 s internal clock period
  • Typical 3.0 ps RMS jitter relative to external trigger
BrandPico Technology

No Review