Typical Power Supply. Transient response
with 4.5m (15 ft) of cable and 1W/lead
between source and GSM phone load.
GND
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MODEL 2304A
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MODEL 2303
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1.888.KEITHLEY
2303, 2304A
Optimized for battery-powered
device testing
Ultra-fast transient response to
load changes
5A continuous output
Pulse peak, average, and
baseline current measurements
100nA DC current sensitivity
100W output (20V @ 5A)
Sinks up to 3A
45W output (15V @ 3A, 9V @ 5A)
Sinks up to 2A
500mV/Div.
0.5 A/Div
Power Supply
GSM Phone Current
w w w.keithley.com
Voltage
100µs/Div.
(U.S. only)
Model 2303 or 2304A rear panel
tery’s re sponse during a large load change by minimizing the maximum drop in voltage and recover-
ing to within 100mV of the original voltage in 40µs or less.
When a portable device such as a cellular phone switches from standby mode to the full power mode
of operation, the current draw on the power supply can change by as much as 1000%. While a bat-
tery’s voltage will de crease by the value of the voltage drop across the battery’s low internal resist-
ance, a con ven tion al power supply will have a significant voltage drop (more than one volt) and take
milli seconds to recover to the original voltage level. For portable devices that operate at full power
only for short intervals, the full power event is over before a conventional power supply can recover.
For example, cellular phones designed in ac cor dance with the GSM cellular phone standard transmit
Keithley’s High Speed Power Supply. Transient
response with 4.5m (15 ft) of cable and 1W/
lead between source and GSM phone load.
High Speed Power Supplies
GND
Power Supply Voltage
500mV/Div.
0.5 A/Div
GSM Phone Current
100µs/Div.
A
G R E A T E R
M E A S U R E
The Model 2303/2304A Power Supplies provide
both voltage control and power consumption
moni toring for automated testing of portable,
battery-operated devices. These power supplies
are optimized for testing battery-operated, wire-
less communication devices such as cellular
phones that undergo substantial load changes
for very short time intervals. These power sup-
plies exhibit outstanding voltage stability during
pulse load changes and can simultaneously
measure load currents, even if they are short
pulses. In addition, this family of power supplies
can sink current and, thus, take on the charac-
teristics of a discharged, rechargeable battery for
testing chargers and charger-control circuitry.
5A Output Capacity
Both the 100W Model 2304A and the 45W Model
2303 can supply 5A (at 20V for the Model
2304A and 9V for the Model 2303) to serve the
peak pulse loading requirements of battery-oper-
ated devices. In both instruments, the maximum
current of 5A can be delivered continuously. The
Model 2304A can supply up to 20V DC while the
Model 2303 can supply up to 15V.
Fast Response to Load Changes
Keithley’s High Speed Power Supplies are
designed to simu late the current drive capacity
of a battery. The power supplies simulate a bat-
and receive information in 576µs pulses. If the
power supply used to test them cannot re cov er
quickly enough, the per for mance of the device-
under-test will be compro mised by the power
supply. If the power supply voltage drops below
the threshold of the phone’s low- battery detec-
tion circuitry for a sufficient amount of time, the
phone will turn off during testing, giving a false
indication of a failed device.
The Models 2303/2304A’s fast transient response
to large load changes will enable test engineers
to test their portable products properly and
eliminate false failures due to conventional
power supplies with slow re sponse times. In
this way, the power supplies ensure maximum
production throughput when testing portable
devices.
O F
C O N F I D E N C E
