Patent ID: 6831519
Filing Date: 2004-12-14
Classification: H03F

Abstract:
A method for allowing efficient pulse-type enhancement of the voltage supplied to a power amplifier fed by a power supply being connected to said power amplifier at a first feeding point through a main supply path connected via a component having a high impedance to an enhancement pulse at said feeding point, and to a second feeding point, comprising:a) providing a supplementary supply path for providing enhance operating voltage to said power amplifier from one of said power supply and a second power supply; b) providing a pair of a first and a second controllable impedances being connected by a common contact, each of which having a separate control input and being capable of being in a non-conducting state, and at least one of which is capable of being in a desired variable level of conduction, up to full conduction; c) connecting one contact of said first controllable impedance to said second feeding point; d) connecting one of said power supply and said second power supply across the contacts of said pair which are not connected at said common contact; e) connecting a capacitor between said common contact and said first feeding point; f) during the time period when no enhancement is required, simultaneously and separately controlling said first controllable impedance, through its separate control input, to be in its conducting state and effectively connect said common contact to said second feeding point of one of said power supply and said second power supply, and controlling said second controllable impedance, through its separate control input, to be in its non-conducting state and thereby, effectively disconnecting said common contact from said second feeding point and allowing said capacitor to charge to essentially the voltage of said power supply; g) during the time period when enhancement is required: g.1) controlling said first controllable impedance, through its separate control input, to effectively disconnect said common contact from one contact of said, or another power supply and; g.2) simultaneously and separately, controlling said second controllable impedance, through its separate control input, to be in a conduction level that corresponds to a desired enhancement voltage level at said first feeding point, thereby increasing the magnitude of the voltage at said common point, to which a contact of said capacitor is connected, and thereby causing an essentially similar increase in the voltage at said first feeding point, to which the other contact of said capacitor is connected, up to said desired enhancement voltage level.