ADL5322 Просмотр технического описания (PDF) - Analog Devices

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ADL5322

700 MHz to 1000 MHz GaAs Matched RF PA Predriver

Analog Devices 

Data Sheet

Figure 16 shows how ACP varies with output power level. The

close-in ACP is a function of the signal coding and is unaffected

by output headroom at these power levels. The ACP measured

at 1.98 MHz carrier offset is −72 dBc at 10 dBm output power

(12 dB below the required 60 dBc). At 4 MHz carrier offset, the

noise and distortion measured in a 1 MHz bandwidth is −75 dBm

at 6 dBm (total) output power (0 dBm per carrier). In a 50 dBm

transmitter, this corresponds to an antenna-referred output

power of −31 dBm (1 MHz), which is 18 dB below what is

required by the CDMA2000 standard.

ADL5322

–30

–30

–40

–40

–50

–50

ACP1 (dBc) – 750kHz OFFSET – 30kHz RBW

–60

–60

–70

ACP3 (dBm) – 4MHz OFFSET – 1MHz RBW

–70

–80

–80

ACP2 (dBc) – 1.98MHz OFFSET – 30kHz RBW

–90

–90

–100

–100

–10 –8 –6 –4 –2 0 2 4 6 8 10

OUTPUT POWER (dBm)

Figure 16. CDMA2000 ACP vs. Output Power per Carrier; 4 Adjacent Carriers

Rev. A | Page 9 of 12

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