Accurate UMTS power transition with power alignment loop between two different modulation modes for polar transmitters

Summary form only given, as follows. In UMTS cellular handsets, low-power-consumption RF blocks are strongly demanded. A fast-feedback power control technique named power alignment loop (PAL) is proposed for polar transmitters. The PAL can realize accurate UMTS power transition over the two different modulation modes. Measurement results shows that the power accuracy between the two modes can satisfy the 3GPP standard within 25 microseconds from the slot boundary. The average current consumption of the transmitter is 128.2 mA at the battery.