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2 Ch TD Differential pulse generator

  • 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

Typical applications include:

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

PG912, 2 Ch Tunnel Diod ( TD)

Differential 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

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.


More Information
Number of Output Channels 2
Pulse Generation Technique TD
Output Impedance 50 Ω
Output Amplitude 200 mv fixed
Pulse Transition Time <40 ps
Output Connector N(m)
Differential Deskew 200 ~ 300 ps
Deskew Resolution 1 ps
Host Interface USB2
Software PicoSource PG9000
Dimensions 190X180X40 mm WDH
Manufacturer Pico Technology
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