Power amplification module and front end circuit

Patent metadata

Field	Value
Publication number	US-2016112009-A1
Application number	US-201514977814-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Jul 1, 2013
Publication date	Apr 21, 2016
Grant date	—

Abstract

A PA module ( 10 ) includes multiple amplifying elements ( 11 a, 11 b ) and a variable filter circuit ( 12 ). The amplifying elements ( 11 a, 11 b ) amplify a transmission signal in a frequency range including multiple communication bands and are cascade-connected to each other. The variable filter circuit ( 12 ) is connected between the amplifying elements ( 11 a, 11 b ). The variable filter circuit ( 12 ) uses a transmission band corresponding to a used communication band selected from the multiple communication bands as a pass band and a reception band corresponding to the used communication band as an attenuation band.

First claim

1 . A power amplification module comprising:
a plurality of amplifying elements amplifying a transmission signal in a frequency range including a plurality of communication bands and cascade-connected to each other; and a variable filter circuit connected between the amplifying elements, wherein the variable filter circuit uses a transmission band corresponding to a used communication band selected from the plurality of communication bands as a pass band and a reception band corresponding to the used communication band as an attenuation band.

2 . The power amplification module according to claim 1 ,
wherein the variable filter circuit includes a plurality of filter components and a switch circuit switching between the filter components.

3 . The power amplification module according to claim 1 ,
wherein the attenuation band of the variable filter circuit is continuously varied.

4 . The power amplification module according to claim 1 ,
wherein the variable filter circuit is a band pass filter.

5 . The power amplification module according to claim 1 ,
wherein the variable filter circuit is a band elimination filter.

6 . The power amplification module according to claim 1 ,
wherein the variable filter circuit uses only a used transmission modulation band, in the transmission band, as the pass band.

7 . The power amplification module according to claim 1 , further comprising:
at least one matching circuit performing matching in the frequency range including the plurality of communication bands, wherein the amplifying elements include a first amplifying element and a second amplifying element, wherein an output terminal of the first amplifying element is connected to an input terminal of the variable filter circuit, wherein an input terminal of the second amplifying element is connected to an output terminal of the variable filter circuit, and wherein the matching circuit is connected at least one of between the output terminal of the first amplifying element and the input terminal of the variable filter circuit and between the input terminal of the second amplifying element and the output terminal of the variable filter circuit.

8 . The power amplification module according to claim 7 ,
wherein the matching circuit is connected between the output terminal of the first amplifying element and the variable filter circuit and between the input terminal of the second amplifying element and the variable filter circuit.

9 . The power amplification module according to claim 7 ,
wherein the matching circuit is connected to an input terminal side of the first amplifying element and an output terminal side of the second amplifying element.

10 . The power amplification module according to claim 7 ,
wherein the matching circuit includes at least one variable reactance.

11 . The power amplification module according to claim 10 ,
wherein the variable reactance is a variable capacitance element.

12 . The power amplification module according to claim 10 ,
wherein the variable reactance includes a plurality of reactances having values not varied and a switch circuit switching between the reactances.

13 . The power amplification module according to claim 10 ,
wherein the matching circuit performs temperature compensation by varying the variable reactance based on a measurement result by a temperature sensor.

14 . The power amplification module according to claim 7 ,
wherein the matching circuit is configured by cascade-connecting a circuit composed of a reactance connected in series and a reactance connected in parallel.

15 . A front end circuit comprising:
a circulator including a first terminal, a second terminal, and a third terminal; an antenna connected to the first terminal; a reception circuit connected to the second terminal; and a transmission circuit connected to the third terminal and including the power amplification module according to claim 1 , wherein the circulator supplies a high-frequency signal input into the first terminal to the second terminal and supplies a high-frequency signal input into the third terminal to the first terminal in the frequency range including the multiple communication bands.

16 . The power amplification module according to claim 2 ,
wherein the variable filter circuit is a band pass filter.

17 . The power amplification module according to claim 3 ,
wherein the variable filter circuit is a band pass filter.

18 . The power amplification module according to claim 2 ,
wherein the variable filter circuit is a band elimination filter.

19 . The power amplification module according to claim 3 ,
wherein the variable filter circuit is a band elimination filter.

20 . The power amplification module according to claim 2 ,
wherein the variable filter circuit uses only a used transmission modulation band, in the transmission band, as the pass band.

Assignees

• Murata Manufacturing Co

Inventors

• HITOMI Shinya
• OBIYA Hidenori
• Sato Tsuyoshi
• Yanagihara Shingo

Classifications

• H04B2001/0416

  having gain or transmission power control · CPC title

• H03F2203/21139

  An impedance adaptation circuit being added at the output of a power amplifier stage · CPC title

• H03F1/0205 Primary

  in transistor amplifiers · CPC title

• H04B1/04

  Circuits · CPC title

• H03F1/565

  using inductive elements · CPC title