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Amplifier device

A technology for amplifiers and peak amplifiers, applied to amplifiers, parts of amplifiers, improved amplifiers to improve efficiency, etc., can solve problems such as degradation of distortion characteristics

Inactive Publication Date: 2007-05-09
KOKUSA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case the distortion characteristics are inevitably degraded

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0038] Referring to FIG. 4 , in the amplifier device according to the first embodiment of the present invention, an input signal from a signal input terminal 1 is input to a coupler 11 . For example, the coupler 11 is a T-shaped branch line, a 3-dB coupler, or an unequal splitter formed on a wiring substrate, and includes a first coupling terminal 11a and a second coupling terminal 11b. The first coupling terminal 11 a is connected to the input terminal of the level sensor 12 , and the second coupling terminal 11 b is connected to the input terminal of the delay line 15 . For example, the level sensor 12 is a wave detector. The output terminal of the delay line 15 is connected to the input terminal of the splitter 2 .

[0039] One output terminal of the splitter 2 is connected to an input terminal of a carrier amplifier 4 including an input matching circuit 41 , an amplifier element 42 and an output matching circuit 43 . The other output terminal of the splitter 2 is connect...

no. 2 example

[0065] Referring to Fig. 6, an amplifier device according to a second embodiment will be described. As shown in FIG. 6, the amplifier device of the second embodiment is obtained by adding the following elements to the device of the first embodiment: a level shifter 16, which is arranged between the level shifter 12 and the preamplifier 54; A preamplifier 44 is provided on the input side of the carrier amplifier 4 and operates as a class AB amplifier; and a preamplifier 54 is provided on the input side of the peak amplifier 5 . The level shifter 16 converts the signal sensed by the level sensor 12 into a bias voltage, which is input to a control terminal of the preamplifier 54 . The bias voltage controls the preamplifier 54 to move from class C to class AB. Other elements of the second embodiment are similar to those of the first embodiment. Corresponding reference numerals denote these elements, and no detailed description thereof will be given.

[0066] The level shifter 1...

no. 3 example

[0070] Referring to Fig. 7, an amplifier device according to a third embodiment will be described.

[0071] As shown in FIG. 7, a variable attenuator 21 and a preamplifier 22 operating as a class AB amplifier are inserted between the delay line 15 and the splitter 2 of the first embodiment to obtain the third embodiment. In addition, the level shifter 13 converts the signal sensed by the level sensor 12 into a control voltage, which is then input to the variable attenuator 21 . Furthermore, the third embodiment does not employ elements corresponding to the variable attenuator 34 in the first embodiment. Since other elements of the third embodiment are similar to those of the first embodiment, these elements are denoted by corresponding reference numerals and will not be described in detail again.

[0072] The signal input to the input terminal 1 is guided to the coupler 11 . Signals are output from the coupler 11 to the first and second coupling terminals 11a and 11b. The s...

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PUM

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Abstract

The first control unit (14) controls the bias applied to the peaking amplifier (5) to: (a) operate the peaking amplifier (5) as class C when the level of the input signal is below a first threshold , (b) when the level of the input signal is higher than a second threshold higher than the first threshold, the peaking amplifier (5) is operated as a class AB with a second conduction angle substantially equal to the second conduction angle a conduction angle, and (c) when the level of the input signal is not lower than the first threshold and is not higher than the second threshold, the peaking amplifier (5) is operated as a class AB with a third conduction angle, the first The third conduction angle is smaller than the first conduction angle.

Description

technical field [0001] The present invention relates to a Doherty amplifier arrangement with improved linearity. Background technique [0002] In a conventional general amplifier for amplifying the power of a radio frequency signal such as a Code Division Multiple Access (CDMA) signal or a multicarrier signal, a distortion compensator is used to widen an operating range to a region near a saturation region, thereby reducing power consumption. There are limitations to reducing the power consumption of conventional amplifiers using only feedforward distortion compensators or predistortion compensators. In recent years, Doherty amplifiers have attracted attention as high-efficiency amplifiers. [0003] In a conventional Doherty amplifier as shown in FIG. 1, a splitter 2 divides an input signal from an input terminal 1 into two signals. One of the generated signals is input to a carrier amplifier 4 . The signal output from the carrier amplifier 4 is directed to a node 62 thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07H03F1/32
CPCH03F3/602H03F1/0288
Inventor 大久保阳一武田康弘中村学本江直树安达胜
Owner KOKUSA ELECTRIC CO LTD
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