Motorola MRFIC1808 Datasheet

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SEMICONDUCTOR TECHNICAL DATA

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by MRFIC1808/D

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Designed primarily for use in wireless Personal Communication Systems
(PCS) applications such as Digital European Cordless Telephone (DECT),
Japan’s Personal Handy System (PHS) and the emerging North American
systems as a preamp for discrete or integrated downmixers. The MRFIC1808
is a two–stage low noise amplifier in a low–cost SO–8 package. The amplifier
can be matched to optimize gain or noise figure with simple off–chip input
matching. The design employs a novel stacked MESFET design which reuses
bias current for the highest gain at minimal current. A CMOS compatible
RECEIVE ENABLE pin allows for very low standby current while the system is
in transmit mode.

• Usable Frequency Range = 1.7 to 2.1 GHz

• 19 dB Typ Gain

• 1.6 dB Typ Noise Figure

• Simple Off–chip Matching for Maximum Gain/Noise Figure Flexi-

bility

• High Reverse Isolation = –34 dB (Typ)

• Low Power Consumption = 13 mW (Typ)

• Single Bias Supply = 2.7 to 4.5 Volts

• Low Standby Current = 8 µA (Typ)

• Low Cost Surface Mount Plastic Package

• Order MRFIC1808R2 forTape and Reel.

R2 Suffix = 2,500 Units per 16 mm, 13 inch Reel.

• Device Marking = M1808

1.9 GHz GaAs
LOW NOISE

AMPLIFIER

CASE 751–05

(SO–8)

REV 1

1

V

DD1

2

N/C

RF OUT

LNA CAP

3

4

Pin Connections and Functional Block Diagram

RX ENABLE

8

7

GND

RF IN

6

5

GND

 Motorola, Inc. 1997

MRFIC1808MOTOROLA RF DEVICE DATA

1

MAXIMUM RATINGS (T

Supply Voltage V
RF Input Power P
Enable Voltage RX ENABLE 5.5 Vdc
Storage Temperature Range T
Operating Ambient Temperature T

= 25°C unless otherwise noted)

A

Rating

Symbol Limit Unit

DD
RF

stg

A

5.5 Vdc
3 dBm

– 65 to +150 °C

– 30 to +85 °C

RECOMMENDED OPERATING RANGES

Parameter Symbol Value Unit

RF Frequency f
Supply Voltage V
RX Enable Voltage, ON RX ENABLE 2.7 to V
RX Enable Voltage, OFF RX ENABLE 0 to 0.2 Vdc

RF

DD

1.7 to 2.1 GHz

2.7 to 4.5 Vdc
DD

Vdc

ELECTRICAL CHARACTERISTICS (V

Characteristic

RF Gain 16.0 19 — dB
SSB Noise Figure — 1.6 — dB
RF Output 3rd Order Intercept Point — 13 — dBm
Output 1 dB Gain Compression –3.0 1 — dBm
Reverse Isolation (s12) — –34 — dB
Input Return Loss — –12 — dB
Output Return Loss — –15 — dB
Supply Current RX Mode — 4.2 6.5 mA
Supply Current Standby Mode (RX ENABLE = 0 V) — 8 25

V

DD

RF OUT

= 3 V, TA = 25°C, RF = 1.9 GHz, RX ENABLE = 3 V, Tested in Circuit Shown in Figure 1)

DD

Min Typ Max Unit

C4

1

2

3

8

7

L1

6

C2

RX ENABLE

C3

RF IN

m

A

MRFIC1808
2

C1

4

C1 2 pF
C2 1.8 pF
C3, C4 22 pF
L1 5.6 nH

5

Figure 1. Applications Circuit Configuration

MOTOROLA RF DEVICE DATA

21

20

19

18

G, GAIN (dB)

17

16

1.8

5 V

4 V

VDD = 3 V

Pin = –30 dBm
TA = 25

°

C

RX ENABLE = 3 V

1.85 1.9 1.95 2
f, FREQUENCY (GHz)

21

20

19

18

G, GAIN (dB)

17

16

15

1.82 1.86 1.88 1.94 1.96 1.98

1.8

–30°C

25°C

TA = 85°C

Pin = –30 dBm
VDD = 3 V
RX ENABLE = 3 V

1.84 1.9 1.92 2
f, FREQUENCY (GHz)

Figure 2. Gain versus Frequency

6

3

0

–3

–6

out

P , OUTPUT POWER (dBm)

–9

–12

–28 –22 –19

–31

–25 –16 –13 –10

Pin, INPUT POWER (dBm)

4 V

Figure 4. Output Power versus Input Power

4.5
VDD = 3 – 5 V

4

RX ENABLE = V

3.5

3

2.5

2

NF, NOISE FIGURE (dB)

1.5

1

1.7

DD

TA = 85°C

25°C

–30°C

1.8 2 2.1

1.9 2.2

f, FREQUENCY (GHz)

5 V

VDD = 3 V

TA = 25°C
f = 1.9 GHz
RX ENABLE = 3 V

–3

–6

out

P , OUTPUT POWER (dBm)

–9

–12

5.25

4.75

4.5

, SUPPLY CURRENT (mA)

DD

I

4.25

Figure 3. Gain versus Frequency

6

3

0

–31

–28 –22 –19

–25 –16 –13 –10

25°C

Pin, INPUT POWER (dBm)

–30°C

TA = 85°C

VDD = 3 V
f = 1.9 GHz
RX ENABLE = 3 V

Figure 5. Output Power versus Input Power

5

f = 1.9 GHz
TA = 25

°

RX ENABLE = 3 V

4

2.8

3.1 3.7 4

3.4 5.2
VDD, SUPPLY VOLT AGE (VOLTS)

4.3

4.6

25°C

C

4.9

Figure 6. Noise Figure versus Frequency

Figure 7. Supply Current versus V oltage

MRFIC1808MOTOROLA RF DEVICE DATA

3