MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MRFIC1808/D
The MRFIC Line
1.9 GHz GaAs
Low Noise Amplifier
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
MRFIC1808
CASE 751–05
(SO–8)
VDD1
1
8
RX ENABLE
N/C
2
7
GND
RF OUT
3
6
RF IN
LNA CAP
4
5
GND
Pin Connections and Functional Block Diagram
REV 1
©
MOTOROLA RF DEVICE DATA
Motorola, Inc. 1997
MRFIC1808
1
MAXIMUM RATINGS
(TA = 25°C unless otherwise noted)
Rating
Supply Voltage
RF Input Power
Enable Voltage
Storage Temperature Range
Operating Ambient Temperature
Symbol
VDD
PRF
RX ENABLE
Tstg
TA
Limit
5.5
3
5.5
– 65 to +150
– 30 to +85
Unit
Vdc
dBm
Vdc
°C
°C
RECOMMENDED OPERATING RANGES
Parameter
RF Frequency
Supply Voltage
RX Enable Voltage, ON
RX Enable Voltage, OFF
Symbol
fRF
VDD
RX ENABLE
RX ENABLE
Value
1.7 to 2.1
2.7 to 4.5
2.7 to VDD
0 to 0.2
Unit
GHz
Vdc
Vdc
Vdc
ELECTRICAL CHARACTERISTICS
(VDD = 3 V, TA = 25°C, RF = 1.9 GHz, RX ENABLE = 3 V, Tested in Circuit Shown in Figure 1)
Characteristic
RF Gain
SSB Noise Figure
RF Output 3rd Order Intercept Point
Output 1 dB Gain Compression
Reverse Isolation (s12)
Input Return Loss
Output Return Loss
Supply Current RX Mode
Supply Current Standby Mode (RX ENABLE = 0 V)
Min
16.0
—
—
– 3.0
—
—
—
—
—
Typ
19
1.6
13
1
–34
–12
–15
4.2
8
Max
—
—
—
—
—
—
—
6.5
25
Unit
dB
dB
dBm
dBm
dB
dB
dB
mA
m
A
VDD
C4
1
8
RX ENABLE
2
7
L1
RF OUT
3
6
C2
C3
RF IN
4
C1
5
C1
C2
C3, C4
L1
2 pF
1.8 pF
22 pF
5.6 nH
Figure 1. Applications Circuit Configuration
MRFIC1808
2
MOTOROLA RF DEVICE DATA
21
5V
4V
21
–30°C
20
19
25°C
TA = 85°C
20
G, GAIN (dB)
VDD = 3 V
19
G, GAIN (dB)
18
17
18
Pin = –30 dBm
TA = 25°C
RX ENABLE = 3 V
1.85
1.9
f, FREQUENCY (GHz)
1.95
2
17
16
15
1.8
1.82
1.84 1.86
Pin = –30 dBm
VDD = 3 V
RX ENABLE = 3 V
1.88 1.9 1.92 1.94
f, FREQUENCY (GHz)
1.96 1.98
2
16
1.8
Figure 2. Gain versus Frequency
Figure 3. Gain versus Frequency
6
3
0
–3
4V
–6
–9
–12
–31
TA = 25°C
f = 1.9 GHz
RX ENABLE = 3 V
–28
–25
–22
–19
–16
Pin, INPUT POWER (dBm)
–13
–10
5V
VDD = 3 V
6
–30°C
3
0
–3
–6
–9
–12
–31
VDD = 3 V
f = 1.9 GHz
RX ENABLE = 3 V
–28
–22
–19
–25
–16
Pin, INPUT POWER (dBm)
–13
–10
25°C
TA = 85°C
Pout , OUTPUT POWER (dBm)
Pout , OUTPUT POWER (dBm)
25°C
Figure 4. Output Power versus Input Power
Figure 5. Output Power versus Input Power
4.5
4
NF, NOISE FIGURE (dB)
3.5
3
2.5
2
1.5
1
1.7
1.8
TA = 85°C
25°C
–30°C
VDD = 3 – 5 V
RX ENABLE = VDD
5.25
IDD , SUPPLY CURRENT (mA)
5
4.75
4.5
f = 1.9 GHz
TA = 25°C
RX ENABLE = 3 V
3.1
4.6
3.4
3.7
4
4.3
VDD, SUPPLY VOLTAGE (VOLTS)
4.9
5.2
4.25
4
2.8
1.9
2
f, FREQUENCY (GHz)
2.1
2.2
Figure 6. Noise Figure versus Frequency
Figure 7. Supply Current versus Voltage
MOTOROLA RF DEVICE DATA
MRFIC1808
3
–33
–32
–30°C
REVERSE ISOLATION (dB)
–34
REVERSE ISOLATION (dB)
VDD = 3 V
4V
–33
25°C
–34
–35
5V
–35
TA = 85°C
Pin = –30 dBm
VDD = 3 V
RX ENABLE = 3 V
1.82 1.84
1.86 1.88 1.9 1.92 1.94
f, FREQUENCY (GHz)
1.96 1.98
2
–36
Pin = –30 dBm
TA = 25°C
RX ENABLE = 3 V
1.84 1.86 1.88 1.9 1.92 1.94
f, FREQUENCY (GHz)
1.96 1.98
2
–36
–37
1.8 1.82
–37
1.8
Figure 8. Reverse Isolation versus Frequency
Figure 9. Reverse Isolation versus Frequency
MRFIC1808
4
MOTOROLA RF DEVICE DATA
Table 1. Scattering Parameters (VDD = 3 Volts, TA = 25°C, RX ENABLE = 3 Volts, 50
W
System)
f
(MHz)
1500
1530
1560
1590
1620
1650
1680
1710
1740
1770
1800
1830
1860
1890
1920
1950
1980
2010
2040
2070
2100
2130
2160
2190
2220
2250
2280
2310
2340
2370
2400
2430
2460
2490
2520
2550
2580
S11
|S11|
0.859
0.870
0.866
0.871
0.873
0.876
0.877
0.880
0.876
0.876
0.885
0.879
0.881
0.885
0.878
0.873
0.860
0.866
0.859
0.861
0.850
0.844
0.834
0.834
0.830
0.817
0.812
0.811
0.800
0.794
0.791
0.784
0.774
0.769
0.751
0.737
0.707
∠φ
–40.95
–41.50
–42.06
–42.92
–43.47
–43.60
–44.86
–45.35
–46.03
–47.22
–48.69
–48.55
–49.87
–50.71
–51.81
–52.42
–52.98
–54.24
–56.12
–56.69
–57.79
–58.53
–60.21
–61.26
–62.53
–63.84
–64.69
–66.64
–67.89
–69.40
–72.05
–73.59
–75.60
–78.81
–80.46
–83.20
–86.12
|S21|
2.58
2.79
3.01
3.18
3.30
3.37
3.52
3.68
3.80
3.87
3.98
3.98
3.98
4.00
4.09
4.19
4.15
3.98
3.85
3.89
4.04
4.18
4.21
4.15
4.17
4.22
4.21
4.14
3.95
3.83
3.88
4.09
4.30
4.33
4.31
4.23
4.08
S21
∠φ
139.07
134.79
130.60
125.11
118.70
112.85
106.23
100.77
94.40
88.75
82.96
76.83
71.11
66.38
61.64
56.66
51.32
44.93
40.93
37.99
35.71
31.89
26.88
22.38
18.75
14.85
9.17
4.09
1.20
0.29
0.33
–2.06
–8.63
–16.94
–23.37
–27.46
–32.67
|S12|
0.013
0.013
0.013
0.014
0.012
0.012
0.012
0.011
0.012
0.011
0.010
0.010
0.009
0.009
0.009
0.008
0.007
0.006
0.005
0.004
0.004
0.004
0.003
0.003
0.004
0.004
0.005
0.006
0.007
0.008
0.009
0.012
0.014
0.015
0.018
0.021
0.024
S12
∠φ
103.72
105.63
99.14
98.40
98.00
97.39
92.68
93.90
93.12
88.55
88.40
89.46
94.75
97.00
88.22
87.57
88.75
100.17
87.86
99.30
98.94
118.15
137.84
141.53
–164.13
–172.30
–165.76
–148.57
–153.96
–144.49
–133.12
–138.06
–138.55
–146.05
–148.25
–149.08
–155.44
|S22|
0.583
0.530
0.474
0.412
0.348
0.285
0.229
0.186
0.168
0.182
0.221
0.272
0.324
0.376
0.425
0.474
0.522
0.564
0.599
0.634
0.661
0.691
0.714
0.734
0.760
0.776
0.787
0.805
0.808
0.819
0.822
0.826
0.824
0.821
0.815
0.798
0.767
S22
∠φ
–79.05
–80.94
–82.85
–83.57
–83.11
–80.54
–73.01
–60.35
–40.74
–20.50
–6.82
–0.29
3.05
4.39
4.25
3.79
2.22
0.85
–0.87
–3.01
–4.59
–6.96
–8.94
–11.49
–13.48
–15.27
–17.20
–19.42
–21.63
–23.38
–26.10
–28.21
–30.43
–32.72
–35.42
–37.56
–39.31
MOTOROLA RF DEVICE DATA
MRFIC1808
5
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