MGA-82563-BLKG 데이터 시트보기 (PDF) - Avago Technologies

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MGA-82563-BLKG

0.1 – 6 GHz 3 V, 17 dBm Amplifer

Avago Technologies 

Operation in Saturation for Higher Output Power

For applications such as pre-driver, driver, and output

stages in transmitters, the MGA-82563 can be operated

in saturation to deliver up to 100 mW (20 dBm) of output

power. The power added efficiency approaches 50% at

these power levels.

There are several design considerations related to reli-

ability and performance that should be taken into ac-

count when operating the amplifier in saturation.

First of all, it is important that the stage preceding the

MGA-82563 not overdrive the device. Referring to the

“Absolute Maximum Ratings” table, the maximum

allowable input power is +13 dBm. This should be re-

garded as the input power level above which the device

could be permanently damaged.

Driving the amplifier into saturation will also affect elec-

trical performance. Figure 17 presents the Output Pow-

er, Third Order Intercept Point (Output IP , and Power

3)

Added Efficiency (PAE) as a function of Input Power. This

data represents performance into a 50Ω load. Since the

output impedance of the device changes when driven

into saturation, it is possible to obtain even more output

power with a “power match.” The optimum impedance

match for maximum output power is dependent on spe-

cific frequency and actual output power level and can be

arrived at empirically.

Increased efficiency (up to 45% at full output power) is

another benefit of saturated operation. At high output

power levels, the bias supply current drops by about

15%. This is normal and is taken into account for the PAE

data in Figure 17.

Like other active devices, the intermodulation products

of the MGA-82563 increase as the device is driven fur-

ther into nonlinear operation. The 3rd, 5th, and 7th order

intermodulation products of the MGA-82563 are shown

in Figure 18 along with the fundamental response. This

data was measured in the test circuit in Figure 10.

30

20

10

Pout

0

-10

-20

-30

-40

3rd

-50

5th

7th

-60

-30 -15 -10 -5 0 5 10 15 20

FREQUENCY (GHz)

Figure 18. Intermodulation Products vs. Input Power.

(V = 3.0 V)

d

50

PAE

40

IP3

30

20

Power

10

0

-10

-20 -15 -10 -5 0

POWER IN (dBm)

5 10

Figure 17. Output Power, IP3, and Power-Added-Efficiency vs. Input Power.

(Vd = 3.0 V)

As the input power is increased beyond the linear range

of the amplifier, the gain becomes more compressed.

Gain as a function of either input or output power may

be derived from Figure 17. Gain compression renders the

amplifier less sensitive to variations in the power level

from the preceding stage. This can be a benefit in sys-

tems requiring fairly constant output power levels from

the MGA-82563.

Operation at Bias Voltages Other than 3 Volts

While the MGA-82563 is designed primarily for use in +3

volt applications, the internal bias regulation circuitry al-

lows it to be operated with power supply voltages from

+1.5 to +4 volts. Performance of Gain, Noise Figure, and

Output Power over a wide range of bias voltage is shown

in Figure 19. (This data was measured in the test circuit

in Figure 10.) As can be seen, the gain and NF are fairly

flat, but an increase in output power is possible by using

higher voltages. The use of +4 volts increases the P by

1dB

over 2 dBm.

If bias voltages greater than 3 volts are used, particular

attention should be given to thermal management. Re-

fer to the “Thermal Design Considerations” section for

more details.

8

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