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Multiway Doherty amplifier

An amplifier and main amplifier technology, applied in the direction of amplifier, amplifier combination, improving amplifier to improve efficiency, etc., can solve the problems of uneven power, gain, insufficient load modulation of main amplifier, etc., achieve uniform power gain, small circuit size, good The effect of reproducibility and stability

Inactive Publication Date: 2013-06-26
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although high saturation operation of the main amplifier can be avoided in the 3-way series DPA, it still has similar problems as the parallel type II DPA, such as uneven power gain; insufficient load modulation of the main amplifier, etc.

Method used

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Embodiment Construction

[0044] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present invention will be omitted during the description to avoid confusing the understanding of the present invention.

[0045] First refer to Figure 11A and 11B Let's discuss nonlinear characteristics in power transistors. Figure 11A The simplified equivalent circuit diagram of a large-signal power transistor in , shows the main nonlinear part of the amplifier. Taking field-effect transistors (FETs) such as Si LDMOSFETs and GaN HEMTs as examples, their main inherent nonlinearity comes from bias-dependent I-V (current-voltage) and Q-V (quantity-voltage) relationships [14]. A simple empirical hyperbolic tangent expression (Angelov model [15], Fager-Statz model [16]) can be used to represent the characteristics of the nonlinear input capacitance (Cgs) and output current (Ids).

[0046] Figur...

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Abstract

The invention provides a multiway Doherty amplifier which comprises an amplifier input circuit, an amplifier output circuit, a main amplifier, at least a first peak value amplifier, at least a second peak value amplifier, a first impedance transformer, a second impedance transformer and a third impedance transformer. An input circuit of the main amplifier is connected with the amplifier input circuit. An input circuit of the first peak value amplifier is connected with the amplifier input circuit or an output circuit of the main amplifier, and an input circuit of the second peak value amplifier is connected with the amplifier input circuit, or the output circuit of the main amplifier or an output circuit of the first peak value amplifier. The first impedance transformer is connected between the output circuit of the main amplifier and the amplifier output circuit. The second impedance transformer is connected between the output circuit of the first peak value amplifier and an output circuit of the second peak value amplifier. The third impedance transformer is connected between the output circuit of the second peak value amplifier and the amplifier output circuit.

Description

technical field [0001] The present invention relates to the design of power amplifiers, in particular to the design and improvement of multi-channel Doherty amplifiers. Background technique [0002] In modern wireless communication systems, such as Wideband Code Division Multiple Access (WCDMA) and Orthogonal Frequency Division Multiplexing (OFDM) systems, high-efficiency power amplifiers are required to adapt to third-generation (3G) and fourth-generation (4G) communication standards. Require. These new standards provide more and more advanced data services in restricted frequency bands and utilize signals with higher peak-to-average power ratio (PAPR). As a result, base station amplifiers using such signals operate at power levels well below their design peak power most of the time. Therefore, for this signal, a conventional Class AB amplifier is not an ideal candidate, because the efficiency of a conventional Class AB amplifier deteriorates severely when operating below...

Claims

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Application Information

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IPC IPC(8): H03F1/07
CPCH03F1/0288H03F3/602H03F2200/198H03F3/68
Inventor 刘林盛
Owner TELEFON AB LM ERICSSON (PUBL)
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