Low Cost, DC to 500 MHz, 92 dB
Logarithmic Amplifier
AD8307 Data Sheet
FEATURES FUNCTIONAL BLOCK DIAGRAM Complete multistage logarithmic amplifier
92 dB dynamic range: −75 dBm to +17 dBm to −90 dBm
using matching network
Single supply of 2.7 V minimum at 7.5 mA typical
DC to 500 MHz operation, ±1 dB linearity
Slope of 25 mV/dB, intercept of −84 dBm
Highly stable scaling over temperature
Fully differential dc-coupled signal path
100 ns power-up time, 150 μA sleep current AD8307
VPS 7 INP 8
INM 1 7.5mA BAND GAP REFERENCE
AND BIASING
SIX 14.3dB 900MHz
AMPLIFIER STAGES +INP 3
NINE DETECTOR CELLS
SPACED 14.3dB COM 2 5 INT 2 2µA
/dB 4 OUT 3 OFS 12.5kΩ
COM INPUT-OFFSET
COMPENSATION LOOP 01082-001 APPLICATIONS ENB MIRROR 1.1kΩ
–INP 6 Conversion of signal level to decibel form …