the pulse of the future directe d energ y incorporated output voltage to +50v output current to 10a 50% maximum duty cycle pulse widths from <1 m m s to 100 m m s instrument - quality analog vo ltage and current monitors for data acquisition designed for precision pulsing of semiconductor devices for pulsed i - v characterization pvx - 2505 50v, 10a precision pulsed i - v pulse generator the pvx - 2505 pulse generator is designed for pulsed i - v (current - voltage) characterization of semiconductor devices at up to 50 volts and 10 amps. it is also well suited for other applications requiring high current, precision voltage pulses. the i - v char acteristics of semiconductor devices are functions of frequency and temperature. curve tracers and other "dc" test systems typic ally step through a range of gate voltages and, at each gate voltage, sweep the drain voltage over the measurement range. the device essentially reaches thermal equilibrium and electronic (semiconductor - trap) equilibrium at each point, yielding different test characteristics than actual rf operational characteristics. by pulsing the device using the pvx - 2505 and taking a measure ment during the pulse, the measurements can be taken before the device heats up. this circumvents the thermal effects associated with conventional "dc" testing, more closely approximates the characteristics of the device when operating at high frequencies, and doesn't activate the semiconductor "traps". the pvx - 2505 is designed using a bi - directional mosfet output stage using dei ?s de - series fast power mosfets. this design provides fast rise and fall times, with minimal overshoot, undershoot and ringing and fast settling times . this controlled voltage waveform allow s the device under test (dut) to stabilize at voltage within a fe w hundred nanoseconds, allowing i - v measurements to be made before device heating begins. a quiescent (bias) voltage may be applied to the pulse generator, allowing the dut to be held at a voltage other than zero, then pulsed above or below this voltage. the pvx - 2505 requires an input gate signal , pulse (vhigh) and optional quiescent (vlow) d c power supply inputs. the output pulse width and frequency are controlled by the input gate signal. the output voltage amplitud e is controlled by the amplitude of the input vhigh and optional vlow dc power supply amplitudes. the front panel controls and monitors provide the flexibility to operate in pulsed mode, or to switch to dc mode, in which the dc voltage generated by the vh igh power supply is applied directly to the dut. integral instrument - quality voltage and current probes are provided to facilit ate pulse data acquisition. the output pulse is launched on an innovative, low - impedance cable. the design of this cable maintai ns the fidelity of the output pulse without introducing pulse distortion or ringing, and provides a convenient means of connecti ng the pulse generator to the dut or bias tee. the pulse generator is a direct - coupled, air - cooled solid - state design, offering equally fast pulse rise and fall times, low power dissipation, and minimal over - shoot, under - shoot or ringing. it has over - curre nt detection and shut - down circuitry to protect the pulse generator from potential damage due to arcs and shorts in the load or interconnect cable.
the pulse of the future directed energy, inc. an ixys company 2401 research blvd., suite 108 fort collins, co usa 80526 970 - 493 - 1901 fax: 970 - 493 - 1903 email: deiinfo@directedenergy.com web: http://www.directedenergy.com specifications (all specifications measured into a 5 w load connected with 4 feet (~1.2m) 5 w coaxial cable) typical 1 s output waveform, 50v 10a (5 w load, 250ns/div horizontal scale, 10v/div vertical scale) typical 100 s output waveform, 50v 10a (5 w load, 25 s/div horizontal scale, 10v/div vertical scale) typical rise and settling times, 50v 10a (5 w load, 100ns/div horizontal scale, 10v/div vertical scale) 50% duty cycle, 50khz, 50v 10a (5 w load, 10 s/div horizontal scale, 10v/div vertical scale) pulse ( vhigh ) and quiescent ( vlow ) pulse voltage inputs maximum value 75 volts dc, floating minimum value 0 volts dc input connector screw terminals, rear panel output maximum value 50 volts at 10 a minimum value 0 volts maximum current 10 amperes means of adjustment controlled by pulse input voltage pulse rise time < 2 00ns 50v (10% - 90%) typical settling time (1) <400ns, including rise time pulse width <1 m s to 100 m s, controlled by input gate pulse recurrence frequency single shot to 50khz, controlled by input gate maximum duty cycle 0.50 (50%) output connector 15 pin d - sub, front panel. pins 1 - 8 are pulse return and pins 9 - 15 are pulse output monitor outputs voltage monitor 1v/v into 1m w , accuracy < 3% of the actual output voltage voltage monitor connector type bnc, front panel current monitor 0.1v/a into 1m w , accuracy < 3% of the actual output current current monitor connector type bnc, front panel control pulse input source external input level +5v 1v into 50 w rise time <20ns gate input connector type bnc, front panel general size 19? (48.25cm) w x 5.2? (13.2cm) h x 13? (33cm) d support power 100 - 240vac, 50/60hz s pecifications subject to change without notice ( 1) settling time is defined as the time from the 10% point to the 99% point of the pulse. pulsed iv data acqu i- sition of both current and voltage waveforms is most optimum when both derivatives are at or near zero. therefore the data acqui sition point should be set beyond the settling time of the pulse. doc #9200 - 0218 rev 2 ? directed energy, inc. 2000
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