NOVELTY - The system has a power amplifier (17) i.e. phone board, amplifying a radio frequency (RF) signal i.e. Band I and V signal, of frequency. An envelope tracker controls supply voltage of the power amplifier using an envelope of the RF signal. An inductor is connected between the power amplifier and the envelope tracker. A bypass capacitor i.e. surface mount component, is connected between the power amplifier and the envelope tracker, where the capacitor and the inductor have resonance. Impedances of the capacitor and the inductor are greater than about 200 ohm at the frequency.    USE - Multi-band power amplifier system for use in a mobile device (claimed) e.g. mobile consumer electronic device such as mobile phone e.g. multi-band/multi-mode mobile phone and Global System for Mobile Communications (GSM) mode mobile phone, communicating over different communication bands. Can also be used for memory chips, memory modules, disk driver circuits, telephone, TV, computer monitor, hand-held computer, personal digital assistant (PDA), microwave, refrigerator, automobile, stereo system, cassette recorder or player, DVD player, MPEG audio layer-3 (MP3) player, radio, camcorder, camera, digital camera, portable memory chip, washer, dryer, copier, facsimile machine, scanner, multi functional peripheral device, wrist watch and a clock.    ADVANTAGE - The system controls the voltage provided to the power amplifier, so that power consumption of a battery can be reduced, thus improving performance of a wireless device. The system provides a multi-level supply block and a voltage adjustment block, so that constraint on design of the system can be reduced, thus permitting the system with greater flexibility and improved power efficiency. The system integrates a set of dies on a module so as to achieve reduction of cost, improved ease of manufacture and reduction in length of interconnections. The envelope tracker controls power amplifier supply voltage to improve efficiency of the system and to reduce capacitive load of the envelope tracker or supply control module, thus providing adequate performance for the system to reduce the load capacitance of the envelope tracker.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for reducing capacitance in a power amplifier system    (2) a mobile device comprising a phone board.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a wireless device that includes power amplifier modules.    Wireless device (11)    Antenna (14)    Power amplifier (17)    Processor (20)    Supply control block (22)