NOVELTY - The device has an envelope tracker (30) generating power amplifier supply voltage (Vcc-pa) for a supply node (77) to electrically supply power to a set of power amplifiers (32a-32c) i.e. multi-stage power amplifiers. A switched capacitor (74a) i.e. surface mount capacitor, is associated with one of the amplifiers and has an end electrically connected to the node. A switch (71a) i.e. FET, controls voltage of another end of the capacitor. The switch electrically floats the latter end of the capacitor when the amplifier is disabled to reduce capacitive loading of the tracker.    USE - Mobile or wireless device e.g. multi-band and/or multi-mode device such as multi-band/multi-mode mobile phone and global system for mobile communications (GSM) mode mobile phone. Can also be used for a consumer electronic product e.g. TV, computer monitor, personal digital assistant (PDA), refrigerator, automobile, DVD player, digital camera, washer/dryer, facsimile machine and multi-functional peripheral device.    ADVANTAGE - The switch is configured to electrically float the end of the decoupling capacitor when the amplifier is disabled so as to reduce capacitive loading of the tracker and to operate as a dampening resistor when the amplifier is enabled, thus improving stability of the power amplifier system. The device controls the voltage level of power supply provided to the power amplifiers such that power consumed from a battery of the device can be reduced, thus prolonging service life of the battery. The device is provided with a multi-level supply control block and a voltage adjustment module, thus reducing constraints on a design of the tracker, and hence improving flexibility and power efficiency of the device.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for reducing capacitive loading in a power amplifier system.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit block diagram of a power amplifier system.    Power amplifier supply voltage (Vcc-pa)    Envelope tracker (30)    Power amplifiers (32a-32c)    Switch (71a-71c)    Switched capacitors (74a-74c)    Supply node (77)