• 3 Delays (SMA Output)
• Delay-Resolution = 25ps
• 44Bit Delayrange (max Delay = 429s)
• very low jitter
• Repetion Rate 8MHz
• Edge, Gate or Pulse Output
• Master/Slave Option if more than 3 Outputs are needed
• several Output voltage levels
• high Load Option
• external/internal Trigger
• external/internal Clock

 

The BME_G02 is a PCI delay generator with 3 outputs generating signals delayed from 50nsec to 429sec, in steps of 25 picoseconds, with respect to a trigger event. The trigger event can be generated by an internal counter or by an external signal fed to the trigger input connector.
The BME_G02 can acheive repetition rates between 0.002Hz and 8MHz.

A trigger circuit starts the delay counters. There are 4 counters, T, A, B and an auxiliary counter. The T, A and B counters actually produce an output signal, while the auxiliary counter can only be used to produce an interrupt.
Three different output modes can be selected:
– Pulse-Mode: a delayed pulse of specified pulse-length
– Edge-Mode: each elapsed delay causes level transition of the output signal. After the last delay expires, all outputs are reset together.
– Gate-Mode: the outputs A and B can be combined to form a gate signal, i.e. a rising(falling) edge after delay A has elapsed and a falling(rising) edge after delay B has elapsed, so you get an pulse with a variable(25ps resolution) pulse-width from 2ns to 429s.

The BME_SG02 card synchronizes the delayed ouputs to an external trigger with an RMS Jitter of less than 250ps.
An external clock can be fed to the external trigger input connector, which can additionally be gated and prescaled.
If more than 3 outputs (or more than 1 gate output) are needed, two ore more cards can be slaved with a ribbon-cable, resulting in 6 or more synchronous delayed outputs.

 

 

General Specifications

 

Delays	Delayrange	50ns-429s (44bit)
	Delayresolution	25ps
	min. Delaytime	50ns (Insertion-Delay) (32bit * 100ns)
	Error	< (1ns +25ppm * delay)1
	RMS Jitter	Output to Output: < (50ps + 10-8 * delay) 1 Trigger to Output: < (250ps + 10-8 * delay)   )only BME_SG02p Trigger to Output: < (50ns + 10-8 * delay)     ) BME_G03p, BME_G05p
Trigger	External	Threshold Range: -2.5V to 2.5V in Steps of 1.2mV Slope : rising or falling edge Input impedance : 10kR or 50R
	Internal	by a modulo-N counter running with the main clock Repetition Rate: 0.002Hz – 8MHz
Outputs T0, A, B	Mode	50R or 25R T0 output can be configured for NIM output pulse
	Risetime	< 2.3ns for TTL < 1.4ns for ECL or NIM (typical)
	Levels	TTL: 0 to 4V normal or inverted ECL: into -2.0 normal or inverted NIM
General	Clock Source	Internal: 10Mhz (80MHz) 25ppm 1 External: max. 250MHz with prescaler
	Interface	PCI-Bus    Signal compatibility 3.3V or 5V
	Interrupts	can be fired with the finish of any of the delays T, A, B or after the auxiliary delay has elapsed. It is also possible to fire an interrupt with the main trigger of the delay generator(s), or after a fixed number of triggers has occurred.

 

¹ Accuracy and Jitter depend on Clock Source (specs with 25ppm clock source) optional 1ppm clock source available

 

 

Options

 

BME_SG02p	Outputs synchronized to external trigger. All other functions as for BME_G02p
BME_G03p	Delays individually resettable with a resolution of 100nsec. All other functions as for BME_G02p
BME_G04p	Delays can be individually fired a second time after main trigger. All other functions as  for BME_G03p
BME_G05p	the outputs can be vetoed with a modulo-counter