Andrew Corporation
Proprietary – Use pursuant to Company Instruction
3 of 8
The amplifier has been designed to support an instantaneous bandwidth of 15 MHz.
Multiple carriers may be placed within a continuous 15 MHz span in the CDMA band
and the product shall meet specified performance marks.
The amplifier has a nominal gain of 47.5 dB. The MCPA is designed to meet IS-95
specifications over frequency, temperature (-5°C to +55°C), and power level (up to a
maximum of 75W RF output power).
Functional Blocks:
The 1960 CDMA MCPA is comprised of the following functional areas:
- Predistortion Circuit
- Main amplifier Stage
- Power conversion and conditioning circuit
-
Controller
circuit
-
Communications
circuit
Inputs and Outputs:
The amplifier is powered from a DC supply voltage which can range from +18V to
+30V. The DC power is brought into the amplifier through a D-Sub connector located on
the front faceplate of the amplifier.
A second D-Sub connector located on the amplifier front faceplate is used for RS-485
communication. This connector is used for amplifier configuration, monitoring and
alarms.
Alarms and operating state are communicated to the outside world through the RS-485
communications bus and a visible bi-color LED located on the amplifier front faceplate.
The RF signal is brought into the amplifier through one SMA type connector located on
the front faceplate of the amplifier. The amplifier RF signal is brought out of the
amplifier through a N type connector located on front faceplate of the amplifier
Control System:
A microprocessor controller is used to control the amplifier alarm system, control
environmental compensation of the amplifier, and to maintain a linearization solution for
the predistortion circuit.
