參數(shù)資料
型號(hào)： SA900BE
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話(huà)/電話(huà)
英文描述： I/Q transmit modulator
中文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP48
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 191K
代理商： SA900BE
Philips Semiconductors
Preliminary specification
SA900
I/Q transmit modulator
1997 Sept 16
9
AC ELECTRICAL CHARACTERISTICS
(continued)
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
TYP
-42
-55
-65
-45
-33
-45
–104
–47
–41
–41
–41
–21
–136
–136
–95
–101
0.8
0.8
UNITS
MIN
-35
MAX
DUALTX
(cont.)
3rd order
5th order
7th order
VGA = 0dB
VGA = –40dB
I and Q quadrature
869 to 894MHz
824 to 849MHz
2 to 824MHz
849 to 869MHz
894MHz to 8.49GHz
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBc
dBc
dBc
dBc
dBc
dBm/Hz
dBm/Hz
dBc/Hz
dBc/Hz
MHz
V
P-P
k
MHz
V
P-P
k
Linearity (0dB VGA, I and Q inphase)
Carrier suppression (I and Q quadrature)
Carrier suppression (I and Q quadrature)
Sideband suppression
-35
-28
-35
Spurious output
TXLO and harmonics
Broadband noise (0dB VGA)
869 to 894MHz
935 to 960MHz
@30kHz
@60kHz
Max frequency
Differential modulation level
Differential input impedance
Max frequency
Differential modulation level
Differential input impedance
Adjacent channel noise power
Alternate channel noise power
2
1
1.0
1
Q/Q
Baseband quadrature differential input
0.6
1
10
1
0.8
0.8
2
1
1.0
1
I/I
Baseband inphase differential input
0.6
1
10
Buffered TXLO differential outputs (AC
coupled)
Frequency range
900
1040
MHz
VSWR (single-ended)
single-ended
differential
single-ended, 50
differential, 100
2:1
50
100
90
180
LO_1/2
Output impedance
Output level
Out ut level
50
100
mV
P-P
mV
P-P
NOTES:
1. Guaranteed by design.
2. Needs a different matching component. Max test frequency is 850MHz with test circuit shown in Figure 11.
FUNCTIONAL DESCRIPTION
Dual Mode Operation
The SA900 transmit modulator provides direct single sideband
quadrature modulation of the difference of the TXLO and VCO
frequencies, while providing quadrature LO signals for the I/Q
modulator. The quadrature LO signals are modulated with high
linearity by the baseband inphase (I) and quadrature (Q) signals.
The summed modulator output produces the lower sideband, while
rejecting the upper sideband. The I and Q inputs also provide DC
biasing for the modulator inputs. The summed output of the
modulator goes to a variable gain amplifier (VGA) to control the
output level, it has 40.0dB of attenuation control range, with 0.63dB
steps. The power control function is programmed by means of a
6-bit word (see Table 3). The VGA output drives the power amp
output stage to provide +2dBm average minimum power level (at
0dB power control) into 50
, in conjunction with external matching
components on DUALTX. The AD (AMPS/DUAL) and the SE
(synthesizer enable) bit control the power up/down of the DUAL
mode function. The transition of the TXEN, from low to high turns
on the modulator. The falling edge of the TXEN signal disables the
synthesizer and modulator. The TXLO is a system supplied LO
signal. The SA900 buffers the TXLO signal (LO_1/2) for use with
the system synthesizer (such as the SA7025) to form the system LO
synthesizer loop. The DUAL mode can also be used for AMPS
operation. The AMPS and DUAL mode modulation is generated by
the system DSP IC to provide the required I/Q baseband modulation
for the SA900. The DUAL output provides low broadband noise
output power (so that the receiver sensitivity is not degraded) and
high linearity to meet cellular phone system needs. Table 1 provides
the VGA power control limits.
The SA900 DUALTX output is externally matched with either a shunt
inductor to V
CC
and a series capacitor or a shunt inductor to V
CC
and a series inductor. This matches the DUALTX output to 50
.
Values of the matching components are dependent on PCB layout,
typical values are shown in Figure 9.
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