Test Setup I
(With Linear Tech Board)
level of the DAC, whose data
range is –1V to +1V. –1V corre-
Agilent (HP) E4406A: The
Agilent E4406A, transmitter
Connect an RF signal generator
with GMSK modulated signal to
RFin EGSM port (RF2) or RFin
DCS/PCS (RF1) on the PA con-
trol board. The maximum input
power at RF1 and RF2 is
+10 dBm. Typically +2 dBm is
applied for the EGSM, DCS/PCS
channels. Connect two measure-
ment instruments, one for
spectrum analyzer and the other
VSA, to RFout (RF6). The maxi-
mum output power should be
limited to +35 dBm.
sponds to the zero code level and tester is used to measure power
the actual 10-bit DAC range is 0V level in EGSM/DCS/PCS mode
to +2.048V. The resolution is set
about 2mV per step. The first
sample of the data file is
displaying the characteristic
time mask.
assigned the “default” value,
which is included 1251 sample
Agilent (HP) E4437B: The signal
generator is used to provide
waveform of input data. This is a GMSK GSM modulated input sig-
“code” value for the Lab View
application program. The first
sample being the default value
and the other 1250 samples
being the waveform data to be
outputted to the DAC. The
default value will then be loaded
into all memory locations after
the 1250 samples have been
loaded. After programming the
flash 16k segments the system
can be set to run by setting the
nal at a defined frequency.
Agilent (HP)8593E: The Agilent
8991A is a spectrum analyzer
used to measure the output
power of diplexer in the fre-
quency and time domain.
Connect the LTC-1758 demo
board and the ACPM-7891 PA
control board using 20 pin-
connection socket. The external
signal control board supplies
bias voltage to PA control board
Tek 2235: The Tek 2235 is an
oscilloscope used to monitor
RAMP signal and Vapc con-
nected using the test points of
rotary switch to the programmed PA control board.
and three timing signals — SHDN, memory segment and resetting
TXEN and PCTL — to generate the external signal control board Agilent (HP) 6623A: The Agilent
V
V
signal of the LTC1758. The
signal is Power control volt-
using the reset switch.
6623A, power supply is nomi-
nally set to voltage 3.5V for Vdd.
PCA
PCA
age output and drives V
voltage of ACPM-7891 to define
power ramp profile. Figure C2 in Without LTC1758 demo board,
Appendix C details the LTC1758
timing diagram.
Test Setup II
(Without Linear Tech Board)
APC
SHDN is set to 2.8V as high mode
during TXEN and RAMP are
enable.
we can get the same test result
as above test. In this case, the
Agilent (HP) 3245A generates
two relevant signals, TX_EN and
RAMP with synchronized time.
Agilent (HP) 3245A: The Agilent
3245A, function generator with
two channels is set to two rel-
evant signals based on the GSM
specification. One signal gener-
ates TX_EN with 2.7V that has a
period of 4.615 ms with a duty
cycle of 12.5% (577 µs) and
The RF power supply voltage of
the PA control board is set by
V
on the external signal
BATT ADJ
control board. This voltage can
be varied over a 2.7V to 5.3V
range and is nominally set to
Connect an RF signal generator
with GMSK modulated signal to
RFin EGSM port (RF2) or RFin
DCS/PCS (RF1) on the PA con-
trol board. Typically +2 dBm is
applied for the EGSM, DCS/PCS
channels. Connect two measure-
3.5V. The V
voltage can be
BATT
216 Hz frequency. This TX_EN
connects to TX_EN (TP7) pin on
the RF control board.
monitored on TP5 on the PA
control board.
The other signal is RAMP signal
that is same as PCTL of
LTC1758. This RAMP connects to
RAMP (TP6) pin on the RF con-
trol board.
Linear Technologies supplies the ment instruments, one for
application program associated
with the .txt file to be down-
loaded to the FLASH memory.
The program controls the code
spectrum analyzer and the other
VSA, to RFout (RF6). The maxi-
mum output power should be
limited to +35 dBm.
18
HP [ HEWLETT-PACKARD ]
