Nanosecond Pulse Shaping
Programmable Pulse Generator
- Arbitrary pulse generator
- 5 GS/s, 200 ps time bins
- Record length 512 Bytes / 102.4 ns
- 8 bit resolution
- High output amplitude, up to -12 V
- Pulse width up to 4 ns
The PPG 512 is based on a programmable waveform generator, that permits to generate pulse patterns in a cyclic sequence of 512 bytes. The 512 bytes are stored in a special high-speed memory that can be read out at the full speed of 5 GS/s. This results in a timing resolution of 200 ps per byte (other values possible on request). By loading a data set, arbitrary pulse sequences can be defined with an amplitude resolution of 8 bits (0 to 255). This pre-defined sequence can then be run as a gapless loop at the full speed of 5 GS/s or started and stopped by an external control signal.
Output amplitude between 0 V and -12 V
The output of the internal Digital to Analog Converter (DAC) is amplified by a broadband three-stage amplifier, which generates negative output voltages with a maximum amplitude around -12 V (into 50 Ohm). Other amplitudes are available on request. The output of the amplifier can further be superimposed by an external DC bias voltage in the range between -10 V to +10 V.
Additional external signal inputs are available to control the reading of the complete 512 byte sequence as well as start or stop the reading at arbitrary times.
A synchronization signal is output by the PPG 512, that signals the full period of all 512 bytes, i.e. every 102.4 ns. An unamplified copy of the pulse pattern is also available at a separate output and can be used to, e.g., trigger other devices such as TCSPC units.
Easy programming via DLL
Programming the pulse patterns is possible via a programming library (DLL) for Windows by simply loading a suited array of 512 bytes into the onboard memory. The programmed pulse pattern is stored in the memory as long as the unit is powered on.
|Readout speed||5 GS/s, 200 ps time bins, other sampling rates <5 GS/s on request|
|Max. pulse width||approx. 4 ns (amplifier limited)|
|Output signals (into 50 Ohm)|
|Main output||adjustable between 0 V and -12 V in 256 steps (8 bit), superimposed by DC Bias, other values on request|
|Aux output||attenuated main output without DC bias, max. amplitude -2 V|
|Sync out||+0.5 V after reading all 512 bytes, i.e. every 102.4 ns|
|DC Bias||any external voltage between -10 V and +10 V|
|Reset||>+3 V stops pulse pattern generation, <0.5 V restarts pattern generation|
|OP mode||>0.75 V and <1.1 V stops pattern generation after reading all 511 bytes
<0.4 V continues pattern generation with byte 0 after reading all 511 bytes
|Operating system||Windows 7 / 8 / 10|
|PC interface||USB 3.0|
All Information given here is reliable to our best knowledge. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external appearances are subject to change without notice.
Output on “RF MAIN out” for the byte sequence:
00 00 00 FF FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FF 00 00 00 00 00 00 00 00