资料介绍
蜂窝式手机中的噪声控制0.35 V ( IF ) ( BER )
100dB 80dB
PC
TDMA
3.6V 50% 3dB ( Li+ ) 800mA PCB GSM IS-136
ASIC DSP ASIC
Li+ PROTECTION BOOST SMPS
ASIC
P-CH
S ENABLE BUCK SMPS 2.0V DIGITAL ASIC
PA
S
( ASIC ( LDO )
1)
LDO1 ENABLE FREQUENCY SYNTHESIZER
ENABLE
LDO2
RECEIVE RF
(
GSM IS-95
)
LDO3 ENABLE
TRANSMIT
LDO4
STANDBY POWER
1.
8
MAX881 ( DC-DC ( LO ) IC MAX1688 ) ( 2) ( MAX1687/ ( PLL ) 30kHz ) 2V PLL VCO VCO PLL GaAsFET 25MHz/2V VCO VCO VCO 1 GaAs ( ) 4 MOSFET 2 3 PSRR (TCXO/VCTCXO) Q PLL VCO 12.5MHz/V VCO ( VCO ) AMPS 880MHz ±12.5MHz ( VCO PLL 3V 25MHz ( ) 3)
PA
MAX881 10 MAX GaAs IC (~1mVp-p)
PLL
PLL
LI+ SHDN CHARGE PUMP IN C3 OUT C4 FB P-CH
PA POWER SWITCH
C1+ C1 C1NEGOUT C2
C
L1 450A (MAX) Li+ R1
MAX1687
IN LX1
LX2
5V OUT
2A PEAK
BIAS RF IN
MAX881R
RF TO ANTENNA PA
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