The LTC5532 can be used for RF power detection and control. Figure 2 is an example of a transmitter power controller, using the LTC5532 with a capacitive tap to the power amplifier. A 0.5pF capacitor (C1) followed by a 200W resistor (R1) form a coupling circuit with about 20dB loss at 900MHz referenced to the LTC5532 RF input pin. In the actual product implementation, component values for the capacitive tap may be different depending on parts placement, PCB parasitics and parameters of the antenna.