MGA-52543 데이터 시트보기 (PDF) - HP => Agilent Technologies

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MGA-52543

Low Noise Amplifier

HP => Agilent Technologies 

2.2 nH 18 pF

42

3.3 nH

22 nH

360 pF

+5V

Figure 7. Schematic of 1.9 GHz Circuit.

A schematic diagram of the

complete 1.9 GHz circuit with the

input and output match and DC

biasing is shown in Figure 7.

DC bias is applied to the

MGA-52543 through the RFC at

the RF output pin. The power

supply connection is bypassed to

ground with capacitor C2. Provi-

sion is made for an additional

bypass capacitor, C3, to be added

to the bias line near the +5 volt

connection. C3 will not normally

be needed unless several stages

are cascaded using a common

power supply.

Since the input terminal of the

MGA-52543 is at ground potential,

an input DC blocking capacitor is

not needed unless the amplifier is

connected to a preceding stage

that has a voltage present at this

point. The values of the DC

blocking and RF bypass capaci-

tors should be chosen to provide

a small reactance (typically < 5Ω)

at the lowest operating frequency.

For this 1.9 GHz design example,

18 pF capacitors with a reactance

of 4.5 Ω are adequate. The reac-

tance of the RF choke (RFC)

should be high (i.e., several

hundred ohms) at the lowest

frequency of operation. A 22 nH

inductor with a reactance of 262 Ω

at 1.9 GHz is sufficiently high to

minimize the loss from circuit

loading.

The completed 1.9 GHz amplifier

for this example with all compo-

nents and SMA connectors

assembled is shown in Figure 8.

The amplifier input intercept point

IIP3 was measured at a nominal

+17.5 dBm. P1dB measured

+17.5 dBm.

L1

3.3 nH LL1608-FH3N3

L2

2.2 nH LL2012-F2N2

RFC

22 nH LL1608-FH22N

C1

18 pF chip capacitor

C2

470 pF chip capacitor

C3

10000 pF chip capacitor

Table 1. Component Parts List for the

MGA-52543 Amplifier at 1900 MHz.

Performance of MGA-52543

1900 MHz Amplifier

The amplifier is biased at a Vd of

5 volts. The measured noise figure

and gain of the completed ampli-

fier is shown in Figure 9. Noise

figure is a nominal 2.0 to 2.2 dB

from 1800 through 2000 MHz. Gain

is a minimum of 14.3 dB from

1800 MHz through 2000 MHz.

Measured input and output return

loss is shown in Figure 10. The

input return loss at 1900 MHz is

11.2 dB with a corresponding

output return loss of 21.9 dB.

16

Gain

12

8

4

NF

0

1.6 1.8

2

2.2 2.4 2.6

FREQUENCY (GHz)

Figure 9. Gain and Noise Figure Results.

0

-4

Input RL

-8

-12

-16

Output RL

-20

-24

1.6 1.8

2

2.2 2.4 2.6

FREQUENCY (GHz)

Figure 10. Input and Output Return Loss

Results.

Agilent

Technologies

MGA - 5X

IP 9/99

L2

C1

IN L1 42

RFC

C2

OUT

C3

Vd

Figure 8. Complete 1.9 GHz Amplifier Circuit.

11

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