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The device is intended for use within an RF transmit power control
loop in GSM mobile phones and supports GaAs HBT and bipolar RF
single supply power amplifiers. The circuit operates with a single
supply from 2.7V to 3.3V.
The LMV243
contains an RF detector, error amplifier, ramp V/I converter and
output driver. The LMV243 input interface consists of the RF input,
Ramp voltage, and a digital input to perform the function
"Shutdown/Transmit Enable". The device will be active in the case
TX_EN = HI, otherwise, the device goes into a low power consumption
shutdown mode. During shutdown the output will be in high impedance
(tri-state).
A single
external RC combination is used to provide stable operations that
accommodates individual PA characteristics.
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