LOGAMP3 90 dB Logarithmic Amplifier


·      High-speed logarithmic signal compression

·      High dynamic range – up to 90 dB

·      Selectable input coupling

·      Selectable input impedance

·      Compact size

·      Input protection for high-voltage transients 


LOGAMP3 is a stand-alone logarithmic amplifier (log amp). It provides high-speed logarithmic signal compression from micro volts to volts with exceptional linearity. Both positive and negative information may be processed over a wide range of duty cycles. The diagram below shows the response chart of the log amp. The weaker signals get higher magnification than the stronger signals. The output signal from the log amp can be further processed by the hardware on a receiver board.

LOGAMP3 is widely used for ultrasonic testing on high attenuation materials which require high dynamic range of signals on one scope screen without using high resolution ADC instrument. Applications in the ultrasonic testing include composite material evaluation, corrosion mapping with rough surfaces, small flaw detections, and some tests with wide range of signal amplitude. Other applications include LIDAR, lasers, and electro-optics.


Input Impedance   100 or 50 ohms switch selectable

 Input Coupling      AC or DC switch selectable

 Input Range           0.0001 to 10 Vp-p

 Input Noise            16 micro volts typical

 Pulse Response     Rise time: 12 ns (DC-30 MHz)

                                  Fall time: 15 ns typical

Operating Temperature    0°C to 50°C

Output                   Single-ended, Noise: 7mVRMS typical, Load: >=50 ohms, Slope: 29 mV/dB typical

 Polarity                 Non-Inverting

 Linearity                +/-1 dB

 Power                   12VAC/100mA from an AC/AC adapter

 Dimension           4.5”x2.7”x1.2” (107mm x 70mm x 30mm)

 Weight                   7 oz. (0.2kg)

Part Number:
LOGAMP3      Stand-alone 90dB Logarithmic Amplifier (full wave form) with BNC connectors, AC-AC power adapter            Download PDF data sheet
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