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1. General Product Description
SMART Amplifier (SMARTAMP) is a bi-directional amplifier designed to match any
advanced spread spectrum system, either direct sequence or frequency hopping, to
extend the operating range of wireless equipment. It is provided in a wide range of
frequencies, such as 900 MHz, 2400 MHz, or 5800 MHz. It works in Time-Division
Duplex (TDD) mode that allows the radio device to share the antenna in different time
intervals. SMARTAMP consists of an intelligent algorithm and Automatic Gain
Controlled (AGC) circuits to maintain the output power and prevent transmit signal
saturation. The input transmit power level is sensed by the Radio Frequency (RF)
sensor and the gain is automatically adjusted to minimize the signal distortion so that
the desired signal quality can be assured..
This product has a wide range of wireless applications in Wireless Local Area Network
(WLAN), Wireless Local Loop (WLL), Wireless Internet Access (WIA), wireless modem
connection with point-to-point, point-to-multipoint, where the Time Division Duplex
(TDD) technology is used.
2. Background
In wireless applications, when longer operating range is required, the add-on antenna
amplifier and DC injector set are often a choice. Because of different site layout and
hardware configuration, it is almost impossible for amplifier manufacture to design the
amplifier and fit all applications. Typically, in most applications, the interconnection
cable could have different length from a few feet to a few hundred feet. Also, different
radio modems have different output powers. Thus, the system installer must carefully
measure the input RF power at the antenna amplifier and specify the gain of the
amplifier in order to maintain the system performance. With different systems, different
amplifiers are required. With this invention, the major difference as compared to other
existing technology, is the “SMART function” - power level detection and automatic gain
control circuit. With SmartAmp, the gain can be intelligently adapt to the input power
level in a wide range and automatically further adjusted to accommodate the cable and
connectors loss, by however length and configuration. The output power level is
monitored and maintained intelligently; hence the desired performance can be achieved
in all hardware configurations for TDD wireless applications irrespective of installation
environment.
The table on the next page summarizes the difference between SMARTAMP and other
TDD antenna-mount amplifier product.
Differences Between Smart Amp and Other TDD Amplifier
SMARTAMP Other TDD Amplifier
Transmit gain Intelli
ent self Fixed
