LT5534 データシートの表示（PDF） - Linear Technology
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LT5534 Datasheet PDF : 10 Pages
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TEST CIRCUIT
LT5534
Figure 2. Component Side Silkscreen of Evaluation Board
Figure 3. Component Side Layout of Evaluation Board
APPLICATIONS INFORMATION
The LT5534 is a logarithmic-based detector, capable of
measuring an RF signal over the frequency range from
50MHz to 3GHz. The 60dB linear dynamic range is
achieved with very stable output over the full temperature
range from –40°C to 85°C. The absolute variation over
temperature is typically within ±1dB over a 47dB dynamic
range at 1.9GHz.
RF Input Port
The RF port is internally biased at VCC-0.18V. The pin
should be DC blocked when connected to ground or other
matching components. A 47Ω resistor (R1) connected to
ground will provide better than 10dB input return loss up
to 2.5GHz. An additional 2nH inductance in series with
R1 will provide improved input matching up to 3GHz.
The impedance vs frequency of the RF input is detailed
in Table 1.
The approximate linear RF input power range of the LT5534
is from –62dBm to –2dBm with a 50Ω source impedance.
However, this range can be adjusted either upward or
Table 1. RF Input Impedance
FREQUENCY
(MHz)
INPUT
IMPEDANCE (Ω)
50
1429-j429
100
947-j710
200
509-j609
400
250-j440
600
149-j344
800
96.8-j278
1000
67.6-j229
1200
49.7-j193
1400
38.4-j165
1600
30.8-j143
1800
25.4-j125
2000
21.4-j109
2200
18.5-j96.2
2400
16.6-j85.0
2600
15.2-j75.7
2800
13.7-j67.5
3000
12.1-j60.1
MAG
0.938
0.934
0.922
0.908
0.900
0.896
0.893
0.889
0.883
0.879
0.873
0.866
0.862
0.848
0.834
0.826
0.822
S11
ANGLE (DEG)
–1.1
–2.9
–5.6
–9.9
–14.1
–18.3
–22.7
–27.3
–32.3
–37.3
–42.6
–48.0
–53.6
–59.6
–65.6
–71.8
–78.2
5534fc
7
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