RF142

The RF142 Power Amplifier (PA) controller is a highly integrated, monolithic device optimized for use in 900 MHz, 1800 MHz, and 1900 MHz Global System For Mobile communications^® (GSM^®) and other Time Division Multiple Access (TDMA) applications. The control current output from the RF142 can be used to control the transmit power of a dual or multi-band Heterojunction Bipolar Transistor (HBT) PA.

The device consists of two sections: an RF detector, and a gain controller. The RF142, when combined with a PA and a coupler, forms a closed PA control loop, where the PA output power is controlled by a single analog reference voltage, typically supplied by the baseband.

The RF142 device package and pin configuration are shown in Figure 1. The signal pin assignments and functional pin descriptions are specified in Table 1. An RF142 block diagram is shown in Figure 2.