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Amplifier circuit and method

An amplifier and amplifier-level technology, applied in the direction of amplifiers, high-frequency amplifiers, radio frequency amplifiers, etc., can solve problems such as poor distribution of switching points

Active Publication Date: 2016-11-09
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Thus, each of the amplifier arrangements described in Figures 2, 3 and 4 has the disadvantage of requiring several clipped drive signals and also has the disadvantage of a suboptimal distribution of transition points

Method used

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  • Amplifier circuit and method
  • Amplifier circuit and method
  • Amplifier circuit and method

Examples

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Embodiment Construction

[0065] Figure 5a An amplifier arrangement according to the first aspect of the invention is shown. In the example, the amplifier arrangement includes 5 amplifier stages 10 1 to 10 5 , but as will be described below, the amplifier arrangement may comprise any higher number of amplifier stages, including both even and odd numbers of amplifier stages.

[0066] The amplifier arrangement consists of a first amplifier stage 10 1 A quarter wavelength transmission line segment 11 coupled between the output of the amplifier and the output node 15 of the amplifier device 1 to 11 3 cascade. In this example, the cascade consists of three quarter-wavelength transmission line segments 11 1 to 11 3 .

[0067] At least one intermediate junction includes a first amplifier coupled directly to the intermediate junction and a second amplifier coupled to the same intermediate junction via a connecting quarter-wavelength transmission line.

[0068] For example, in Figure 5a , the cascad...

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Abstract

An amplifier arrangement comprises N amplifier stages 101 to 10N, wherein N is an integer equal or greater than five. The amplifier arrangement comprises a cascade of quarter wavelength transmission line segments 111 to 11M coupled between an output of an amplifier of a first amplifier stage and an output node 15 of the amplifier arrangement. At least one intermediate junction 12 in the cascade of quarter wavelength transmission line segments comprises: a first amplifier coupled directly to the intermediate junction 12; and a second amplifier coupled to the same intermediate junction 12 via a connecting quarter wavelength transmission line 131.

Description

technical field [0001] The present invention relates generally to an amplifier circuit and method, and more particularly, to an amplifier circuit and method providing improved efficiency, for example, comprising at least a first An amplifier circuit of the amplifier and the second amplifier. Background technique [0002] Power amplifiers in wideband radio systems are often used to amplify wideband signals or combinations of signals with a high average power ratio PAR. The amplifier must therefore be able to repeatedly output very high power for very short periods, even though the majority of the output power is generated at much lower average power levels. In a system with random phase combinations of many signals (in the absence of any dominant signal), the amplitudes of the signals follow a Rayleigh distribution. [0003] Conventional single-transistor power amplifiers (eg, class B, AB, or F power amplifiers) have a fixed radio frequency (RF) load resistance and a fixed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/60
CPCH03F3/602H03F1/0288H03F3/19H03F2200/255H03F2200/405H03F2200/451
Inventor R·赫尔贝格
Owner TELEFON AB LM ERICSSON (PUBL)
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