Power amplifier based on radio-frequency direct current feedback
A technology for power amplifiers and power amplification, applied in the direction of power amplifiers, etc., can solve the problems of reducing power amplifier efficiency, increasing costs, and large area
Inactive Publication Date: 2014-08-13
WUXI ZHONGPU MICROELECTRONICS CO LTD
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Problems solved by technology
The advantage of this method is that the drain current of the power amplifier can be tracked very accurately, and the disadvantages are also very obvious: First, due to the large current of the power amplifier, the size of the PMOS transistor M13 of the LDO is very large, which results in a large area. Increase the cost; Second, in order to make the PMOS transistor M13 in the saturation region, a certain voltage must be consumed at both ends of its source and drain (greater than the overdrive voltage between the gate and source), which will reduce the output power and reduce the entire power amplifier at the same time efficiency; third, through V REF The method of controlling the drain (or collector) of the power amplifier to control the output power has a relatively small dynamic range. For the case of high dynamic range requirements, a single level of control often cannot meet the needs
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[0015] The detailed description of the present invention directly or indirectly simulates the operation of the technical solution of the present invention mainly through programs, steps, logic blocks, processes or other symbolic descriptions. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention may be practiced without these specific details. These descriptions and representations herein are used by those skilled in the art to effectively convey the substance of their work to others skilled in the art. In other words, for the purpose of avoiding obscuring the present invention, well-known methods and procedures have not been described in detail since they have been readily understood.
[0016] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the pres...
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The invention provides a power amplifier based on a radio-frequency direct current feedback. The power amplifier comprises a power amplification circuit, a sampling circuit, a direct current conversion circuit and a biasing circuit, wherein the input end of the power amplification circuit receives an externally input radio-frequency input signal through an input capacitor, and the power amplification circuit performs power amplification on the radio-frequency input signal and outputs a radio-frequency output signal through the output end of the power amplification circuit; the sampling circuit samples output current of the power amplification circuit to obtain sampling current; the direct current conversion circuit converts the sampling current into direct current feedback current; the biasing circuit comprises a biasing current source for supplying biasing current and supplies biasing voltage to the input end of the power amplification circuit according to the direct current feedback current and the biasing current. Due to the construction of a direct current feedback loop circuit, the output current of the power amplifier is determined according to a loop gain and the biasing current, so that the output power of the power amplifier can be precisely controlled and is less affected by power supply voltage, temperature and technical deflection.
Description
【Technical field】 [0001] The invention relates to a power amplifier, in particular to a power amplifier based on radio frequency direct current feedback. 【Background technique】 [0002] In the design of the power amplifier, the function of the control circuit module provides the reference of the system on the one hand, and on the other hand, it can meet the requirements of the system for the power amplifier, such as the precise control of the output power, and can also provide various protection measures for the power amplifier. [0003] In the prior art, the control circuit of the power amplifier usually adopts a low dropout voltage regulation method (LDO). image 3 It is a schematic circuit diagram of a power amplifier based on LDO control in the prior art, such as image 3 As shown, the power amplifier includes a first power amplifying transistor M11 and a second power amplifying transistor M12, and the gate of the first power amplifying transistor receives an input radio ...
Claims
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Inventor 韩科锋王小保曲广文承继史云龙任启明雷良军
Owner WUXI ZHONGPU MICROELECTRONICS CO LTD