SA9503 Просмотр технического описания (PDF) - Philips Electronics
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SA9503 Datasheet PDF : 16 Pages
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Philips Semiconductors
Dual-band, CDMA/AMPS LNA
and downconverter mixers
Objective specification
SA9503
DESCRIPTION
The SA9503 is an integrated CDMA/AMPS low noise amplifier
(LNA) plus a downconverter, for both the 900 MHz Cellular band and
the 1.9 GHz PCS band. The LNA incorporates 5 settings of digitally
selected stepped gain in the Cellular band and in the PCS band.
One of the modes (high linearity mode) in each of the Cellular and
PCS bands, includes a high IP3 setting in order to meet the 1-tone
CDMA desensitization test. The gain, noise figure and IP3 for the
remaining 4 low current modes in the Cellular band, are designed in
order to have sufficient separation between the antenna power
levels at which the LNA gains are changed, based on multi-tone
interference levels. A 3 dB overlap is allowed in the antenna power
levels for the adjacent modes. Table 1 indicates a typical scenario.
The downconverter portion is based on our SA9502 and is designed
to meet all the stringent spurious rejections that are required in the
Cellular and PCS bands. There are three individual mixer blocks,
each optimized for high linearity with low power consumption for
operation in one of the following modes: 1900 MHz PCS CDMA,
800 MHz Cellular CDMA, or 800 MHz analog FM AMPS/TACS
modes.
The circuit has been designed in our advanced QUBiC3 BiCMOS
process with 30 GHz fT.
FEATURES
Versatile step gain LNA
• Can meet single tone CDMA desensitization requirements
• Can meet CDMA two tone interference requirements
• Cellular
PARAMETER
Gain (dB)
Noise figure (dB)
Input IP3 (dBm)
Current (mA)
• PCS
CEL_L
17
2
5.5
13.2
CEL_1
15.5
1.6
–2
4.9
MODE
CEL_2
9
1.9
–3.5
4.9
CEL_3
3
4.5
2
4.9
CEL_4
–4
11
15
3.7
PARAMETER
Gain (dB)
Noise figure (dB)
Input IP3 (dBm)
Current (mA)
MODE
PCS_L PCS_1 PCS_2 PCS_3 PCS_4
15.2 14.3
8
2
–4.5
2.5
2
2.5
3.7 11.5
4.5
1
–2
–1
16
13.3 5.9
5.9
5.9
3.7
Downconverter typical performance
PARAMETER
Gain (dB)
Noise Figure (dB)
Input IP3 (dBm)
Current (mA)
(Tx) LO output
buffer off
Cellular FM Cellular CDMA PCS CDMA
7.5
11.5
12.5
10
9
9
5
3.5
4
6.8
13
16
• Separate, selectable IF outputs to suit FM and CDMA bandwidths
• Buffered Cellular and PCS LO inputs
• Integrated frequency doubler for PCS mixer LO
• Differential (Tx) LO output buffer (can be switched on or off)
• Low voltage operation down to 2.7 volts
• Mixers current consumption with (Tx) LO buffer on:
– Cellular FM: 16.8 mA
– Cellular CDMA: 23 mA
– PCS: 26 mA
• Low standby current in sleep mode: <50 µA
• BCC32++™ package
APPLICATIONS
• 800 MHz analog FM and CDMA digital receivers
• 1900 MHz PCS band CDMA digital receivers
• Supports dual-band and triple-mode operation
• Digital mobile communications equipment
• Portable, low power radio equipment
BCC32++ is a trademark of Fujitsu Microelectronics.
1999 Jul 29
2
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