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Method and apparatus relating electronic compensation

By dividing and combining signals in the compensation circuit and introducing frequency-related phase shifts and amplitude changes, the problems of complexity and high cost of gain compensation in the existing technology are solved, and uniform gain compensation in a high frequency range is achieved, which is suitable for Different operating frequencies and gain requirements.

Inactive Publication Date: 2004-04-14
ERICSSON AB PATENT UNIT LTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention mainly solves the problem of obtaining methods and devices for providing frequency-dependent gain compensation, which is relatively simple and inexpensive and is easily adapted to various conditions, such as different operating frequency ranges and different requirements for the amount of gain compensation

Method used

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Embodiment Construction

[0037] figure 1 is a simple block diagram of power amplifier 1. The power amplifier 1 may be a transistor power amplifier, eg based on bipolar, LDMOS or GaAs transistors. The power amplifier 1 receives input power Pin through an input terminal, and sends output power Pout through an output terminal. The power amplifier is designed to provide power amplification for signals within a predetermined operating frequency range [f1, f2]. figure 2 Curve L1 is shown, which shows how the gain of the power amplifier 1 varies with frequency f in the operating frequency range. Gain Ga decreases with increasing frequency. Thus, the curve L1 has a negative slope. As mentioned earlier, this is often undesirable. It is generally desired that the gain be independent of frequency, at least within the operating frequency range of the power amplifier. figure 2 Curve L2 in (dotted line) shows this ideal situation. Since it is independent of frequency, the curve L2 is completely flat.

[0...

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PUM

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Abstract

The invention addresses the problem of obtaining ways and means for providing a compensational gain, which can be used for gain compensation in connection with power amplifiers (1) and other devices. According to the invention a power splitter (11) splits a signal into two components. A phase shifter (15) introduces a frequency dependent phase shift in one the components. Means (17, 19) are provided for introducing a change of amplitude in one of the components. A combiner (13) combines the components. By selecting appropriately the frequency dependent phase and the change of amplitutde, a desired gain compensation characteristic is achieved.

Description

technical field [0001] The present invention relates to the field of methods and devices relating to electronic compensation, and more particularly to the part of said field relating to gain compensation. Background technique [0002] It is not uncommon in the art for devices to receive input power and transmit output power with said received input power. The ratio of output power to input power is usually called (power) gain. Gain is often frequency dependent. In some instances this is required, but in most cases it is not desired. [0003] A power amplifier is a device used to amplify signal power. Power amplifiers are used in many applications, for example, radio and television, wireless communications (eg cellular telephones), cable television, hi-fi equipment, etc. For power amplifiers, the frequency dependence of gain is often an important characteristic to consider. [0004] The construction of power amplifiers is usually based on transistor technology, and bipol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/32
Owner ERICSSON AB PATENT UNIT LTE