AD8307 Low Cost DC—500 MHz, 92 dB Logarithmic Amplifier Data ...

AD8307
3.0
3
V OUT (V)
2.5
2.0
1.5
1.0
INT P IN = 4.0V
10MHz, INT = –87.71dBm
INT P IN = 3.0V
10MHz, INT = –96.52dBm
NO CONNECT ON INT
10MHz, INT = –82.90dBm
ERROR (dB)
2
1
0
–1
+INPUT
–INPUT
100MHz
0.5
–2
0
–80 –70 –60 –50 –40 –30 –20 –10 0 10 20
INPUT LEVEL (dBm)
TPC 7. V OUT vs. Input Level at 5 V Supply;
Showing Intercept Adjustment
–3
–80 –60 –40 –20 0
20
INPUT LEVEL (dBm)
TPC 10. Log Conformance vs. Input Level at 100 MHz;
Showing Response to Alternative Inputs
3.0
3
2.5
INT VOLTAGE
INT = 1.0V, INT = –86dBm
2
500MHz
V OUT (V)
2.0
1.5
INT VOLTAGE
INT NO CONNECT, INT = –71dBm
ERROR (dB)
1
0
1.0
–1
100MHz
0.5
INT VOLTAGE
INT = 2.0V, INT = –78dBm
–2
0
–80 –70 –60 –50 –40 –30 –20 –10
INPUT LEVEL (dBm)
0 10
TPC 8. V OUT vs. Input Level at 3 V Supply Using
AD820 as Buffer, Gain = +2; Showing Intercept
Adjustment
–3
–90 –70 –50 –30 –10 10
INPUT LEVEL (dBm)
TPC 11. Log Conformance vs. Input at 100 MHz, 500 MHz;
Input Driven Differentially Using Transformer
2.5
3
2.0
2
500MHz
V OUT (V)
1.5
1.0
100MHz @ –40C
100MHz @ +25C
ERROR (dB)
1
0
–1
100MHz
10MHz
0.5
100MHz @ +85C
–2
0
–80 –60 –40 –20 0
20
INPUT LEVEL (dBm)
TPC 9. V OUT vs. Input Level at Three Temperatures
(–40ºC, +25ºC, +85ºC)
–3
–70 –60 –50 –40 –30 –20 –10 0 10
INPUT LEVEL (dBm)
TPC 12. Log Conformance vs. Input Level at 3 V
Supply Using AD820 as Buffer, Gain = +2
20
REV. B
–5–