DA-0520S41NA Datasheet, PDF (1/4 Pages) American Accurate Components, Inc. – Detector Log Video Amplifiers (DLVA)

Detector Log Video Amplifiers (DLVA)
The content of this specification may change without notification7/01/09
DLVA
Detector Log Video Amplifiers (DLVA)
There are three basic types of logarithmic amplifiers,
Detector-Log Video Amplifiers (DLVAs)
Successive Detection Logarithmic
Amplifiers True Log Amplifiers (TLAs)
A detector log video amplifier (DLVA) is a type of
logarithmic amplifier in which the envelope of the
input RF signal is detected by a standard "linear"
diode detector. The output of the detector is
compressed in the video amplifier section, making
input/output relationship similar to a logarithmic
conversion. In general, the DLVA offers the
advantage of operating over the widest frequency
range, but at the sacrifice of dynamic range.
Limited by the detecting range of square law of the
input diode detector, typical dynamic range for a
DLVA is approximately 40 dB.
In quite a lot of usages, two log cascades are put in
parallel with a RF amplifier incorporated in time of
detection of the log cascade, so that the dynamic
range can be extended to approx.70dB.
Features
Advanced Microwave Hybrid Integrated
Circuits Technology
Frequency Range from 0.5 to 18GHz
Superior Log Linearity
Wide Dynamic Range
Wide Bandwidth
Low Current Consumption
DC-Coupled DLVAs
High Performance
High Reliability
High Repeatability
Compact Size And Light Weight
Custom Design Available
Applications
Radar Systems
Navigation Systems
Laboratory Measurement And Test Equipment
Telecommunications And Data Communications
Military And Instrumentation Systems
Other Commercial Applications
The detected video sections of a DLVA can either be
AC coupled, DC coupled, or pseudo DC coupled.
Each has its advantages, depending upon the application
(i.e., CW operation, temperature compensation, etc.).
The basic configuration of a DLVA is simply a
detector diode to convert the RF energy into a DC
voltage followed by a video amplifier with a
logarithmic transfer function. The combination results
in a device which compresses a large RF signal
range into a narrow range of video voltage.
We have put considerable effort into designing a
DC coupled DLVA with very low baseline drift.
Employing a tunnel diode based detector circuit
coupled with a very stable DLVA, high-speed
miniature DC DLVA with good recovery
characteristics is available.
American Accurate Components, Inc.
188 Technology Drive, Unit H, Irvine, CA 92618
1
Tel: [phone] Š Fax: [phone] Š Email: [e-mail]