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Power amplifier

A technology of power amplifiers and amplifiers, applied in the directions of power amplifiers, amplifiers, gated amplifiers, etc., can solve problems such as constraints

Active Publication Date: 2014-06-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, a matching circuit is required in which the high-frequency signal in the transmission frequency band of the power amplifier does not leak to the short-circuited portion by the shunt-type high-frequency switch. Therefore, there is a restriction on the matching circuit on the path where the shunt-type high-frequency switch circuit is inserted. Case

Method used

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Embodiment approach 1

[0021] figure 1 It is a diagram showing a power amplifier according to Embodiment 1 of the present invention. The amplifiers A1, A2 are connected in series between the input terminal IN and the output terminal OUT. A connection point P1 exists between the input terminal IN and the input of the amplifier A1. A connection point P2 exists between the output terminal OUT and the output of the amplifier A2. In the path from the input terminal IN to the output terminal OUT via the amplifiers A1 , A2 , the connection point P2 is the point with the lowest impedance (for example, the collector terminal or the drain terminal of the amplifier A2 ).

[0022] Amplifier A3 is connected in parallel with amplifiers A1, A2 between connection point P1 and connection point P2. The output power of amplifier A3 is smaller than the output power of amplifiers A1 and A2. A connection point P3 exists between the output of the amplifier A3 and the connection point P2. Capacitor C1 is connected bet...

Embodiment approach 2

[0027] figure 2 It is a diagram showing a power amplifier according to Embodiment 2 of the present invention. The inductor L is connected between the output of the amplifier A3 and the path (connection point P2 ) of the amplifiers A1 and A2 . The series inductor L can make the capacitance value of the capacitor C1 of the shunt-type high-frequency switching circuit appear larger when viewed from the path of the amplifiers A1 and A2 , thereby improving the Q value of the shunt-type high-frequency switching circuit. Thereby, the capacitance value of the actually used capacitor C1 can be reduced, and the layout can be miniaturized. In addition, by increasing the Q value, the circuit before the shunt-type high-frequency switching circuit can be regarded as more open, and the isolation of each path can be improved.

Embodiment approach 3

[0029] image 3 It is a diagram showing a power amplifier according to Embodiment 3 of the present invention. A connection point P4 exists between the output of the amplifier A3 and the connection point P2. Capacitor C2 is connected between connection point P4 and ground. The other structures are the same as those in Embodiment 2. In amplifiers A1, A2, and amplifier A3, since optimum impedances are different, impedance conversion is required when connecting these paths. Therefore, the impedance can be converted by inserting an LC circuit composed of the series inductor L and the shunt capacitor C2 between the two paths. In this way, by performing impedance conversion multiple times, the impedance conversion loss can be reduced, so the circuit loss can be further reduced.

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Abstract

The invention relates to power amplifiers to switch between two or more power amplification paths therein so as to achieve high power load efficiency over the entire power range. Amplifiers (A1 and A2) are connected in series between an input terminal (IN) and an output terminal (OUT). A junction point (P1) is located between the input terminal (IN) and the input of the amplifiers (A1 and A2). A junction point (P2) is located between the output terminal (OUT) and the output of the amplifier (A1 and A2). The junction point (P2) is selected to be the lowest impedance point along the power amplification path that includes the input terminal (IN), the amplifiers (A1 and A2), and the output terminal (OUT), connected in series in that order. An amplifier (A3) is connected between the junction points (P 1 and P 2). The amplifier (A3) is connected in parallel with the series connection of the amplifiers (A1 and A2). A junction point (P3) is located between the output of the amplifier (A3) and the junction point (P2). A switch (SW) is connected at one end to the junction point (P3) and at the other end to one end of a capacitor (C1). The other end of the capacitor (C1) is connected to ground. The switch (SW) is turned off when the amplifier (A3) is turned on, and the switch (SW) is turned on when the amplifiers (A1 and A2) are turned on.

Description

technical field [0001] The present invention relates to a power amplifier used in wireless devices such as portable terminals. Background technique [0002] A power amplifier has a function of switching between two or more power amplification paths according to an output power level in order to improve power load efficiency at all power levels. In addition, a series type high-frequency switch is inserted in the connecting portion of each path to ensure the isolation of transistors in each path, so that unnecessary voltage amplitude is not given to the transistor when it is turned off. [0003] In addition, there is also a power amplifier in which a shunt-type high-frequency switch is inserted on the output side, the high-frequency switch is turned on to realize an ideal short-circuit state, and the impedance of the path in which the high-frequency switch is inserted is controlled (for example, see Patent Document 1). [0004] prior art literature [0005] patent documents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20
CPCH03F2203/7221H03F1/0277H03F3/24H03F2203/21175H03F3/72H03F2203/7233H03F3/211
Inventor 春名贵雄佐佐木善伸
Owner MURATA MFG CO LTD