RMPA1765 Fairchild Semiconductor, RMPA1765 Datasheet - Page 4

• Manufacturer Part Number: RMPA1765
• Description: IC MODULE RF PWR AMP 8PIN 3X3LCC
• Manufacturer: Fairchild Semiconductor

Specifications of RMPA1765

• Current - Supply: 45mA
• Frequency: 1.72GHz ~ 1.78GHz
• Gain: 26dB
• Noise Figure: 4dB
• Package / Case: 8-LCC
• Rf Type: CDMA, CDMA2000, AMPS, K-PCS
• Voltage - Supply: 3V ~ 4.2V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• P1db: -
• Test Frequency: -
• Other names: RMPA1765TR

RMPA1765 Rev. C
Efficiency Improvement Applications
In addition to high-power/low-power bias modes, the efficiency of the PA module can be significantly increased at backed-off RF
power levels by dynamically varying the supply voltage (Vcc) applied to the amplifier. Since mobile handsets and power amplifiers fre-
quently operate at 10-20 dB back-off, or more, from maximum rated linear power, battery life is highly dependent on the DC power
consumed at antenna power levels in the range of 0 to +16dBm. The reduced demand on transmitted RF power allows the PA supply
voltage to be reduced for improved efficiency, while still meeting linearity requirements for CDMA modulation with excellent margin.
High-efficiency DC-DC converters are now available to implement switched-voltage operation.
With the PA module in low-power mode (Vmode = +2.0V) at+16dBm output power and supply voltages reduced from 3.4V nominal
down to 1.2V, power-added efficiency is more than doubled from 9.5 percent to nearly 25 percent (Vcc = 1.2V) while maintaining a
typical ACPR1 of –52dBc and ACPR2 of less than –61dBc. Operation at even lower levels of Vcc supply voltage are possible with a
further restriction on the maximum RF output power.
Recommended Operating Conditions
DC Turn-On Sequence
1) Vcc1 = Vcc2 = 3.4V (typical)
2) Vref = 2.85V (typical)
3) High-Power: Vmode = 0V (Pout > 16 dBm)
Parameter
Operating Frequency
Supply Voltage
Reference Voltage
Bias Control Voltage
Linear Output Power
Case Operating Temperature
Low-Power: Vmode = 2V (Pout < 16 dBm)
(operating)
(shutdown)
(low-power)
(high-power)
(high-power)
(low-power)
Vcc1, Vcc2
Symbol
Vmode
Pout
Vref
Tc
f
4
1720
Min
-30
3.0
2.7
1.8
0
0
Typical
2.85
3.4
2.0
Max
1780
+28
+16
+85
4.2
3.1
0.5
3.0
0.5
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Units
MHz
dBm
dBm
°C
V
V
V
V
V