Patent ID: 8447256

Claim:
A circuit comprising: a balun configured to receive a radio frequency (RF) signal at a first input port and a second input port and configured to output the RF signal; and an attenuator coupled in parallel with the first and second input ports of the balun, a power level of the RF signal output by the balun based at least partially on an impedance of the attenuator, as experienced by the RF signal, the attenuator comprising: a resistor ladder configured to receive at least a portion of the RF signal; and a plurality of switches coupled to the resistor ladder and configured to open and close according to a digital control signal received by the switches such that the impedance of the attenuator, as experienced by the RF signal, is a function of which switches are open and which switches are closed such that the power of the RF signal output by the balun is controlled based at least on the opening and closing of the switches.