Low Cost DC-500 MHz 92 dB Logarithmic Amplifier AD8307 CMOScompatible

AD8307
TYPICAL PERFORMANCE CHARACTERISTICS
8
3
7
2
SUPPLY CURRENT (mA)
6
5
4
3
2
ERROR (dB)
1
0
–1
TEMPERATURE ERROR @ +85°C
TEMPERATURE ERROR @ +25°C
TEMPERATURE ERROR @ –40°C
1
0 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7
V ENB (V)
Figure 3. Supply Current vs. VENB Voltage (5 V)
01082-003
1.8 1.9 2.0
–2
–3
–80 –60 –40 –20 0
INPUT LEVEL (dBm)
Figure 6. Log Conformance vs. Input Level (dBm) at +25°C, +85°C, and −40°C
20
01082-006
8
7
3
INPUT FREQUENCY 10MHz
SUPPLY CURRENT (mA)
6
5
4
3
2
V OUT (V)
2
1
INPUT FREQUENCY 100MHz
INPUT FREQUENCY 300MHz
1
0
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7
V ENB (V)
01082-004
1.8 1.9 2.0
0
–80
–60
INPUT FREQUENCY 500MHz
–40 –20 0
INPUT LEVEL (dBm)
20
01082-007
Figure 4. Supply Current vs. VENB Voltage (3 V)
Figure 7. VOUT vs. Input Level (dBm) at Various Frequencies
3
1.5
2
1.0
1
FREQUENCY INPUT = 300MHz
0.5
ERROR (dB)
0
ERROR (dB)
0
CFO VALUE = 0.01µF
–1
FREQUENCY INPUT = 100MHz
–0.5
CFO VALUE = 1µF
CFO VALUE = 0.1µF
–2
–3
–80 –60 –40 –20 0
INPUT LEVEL (dBm)
Figure 5. Log Conformance vs. Input Level (dBm) 100 MHz, and 300 MHz
20
01082-005
–1.0
–1.5
–80 –60 –40 –20 0
INPUT LEVEL (dBm)
Figure 8. Log Conformance vs. CFO Values at 1 kHz Input Frequency
20
01082-008
Rev. C | Page 6 of 24