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Cross current minimisation

A minimization and main technology, applied in electrical components, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as CMOS technical errors, achieve high accuracy, minimize harmonic distortion, high no-load time-defining effects

Active Publication Date: 2012-05-16
ST ERICSSON SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limited speed of the comparator can introduce serious errors to some CMOS technologies, especially the high-voltage (HV) CMOS technologies commonly used in integrated power amplifiers

Method used

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  • Cross current minimisation
  • Cross current minimisation
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Embodiment Construction

[0025] Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0026] Figure 5 A simplified block diagram is shown of a structure arranged to implement a method according to an embodiment of the invention. The method is based on the idea of ​​coupling a replica amplifier with a current sensor to the main amplifier. Matching of the replica amplifier to the master amplifier means that the transistors of the replica amplifier are oriented in the same direction as the transistors of the master amplifier, and all transistors operate at substantially the same temperature and use the same supply voltage. Furthermore, in some implementations the physical size of the replica amplifier is the same as the transistor size of the main amplifier. The replica amplifier is placed between the transistors of the main amplifier described later, or at least close to the transistors of the main amplifier. The duration of the de...

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Abstract

The present invention relates to a method of optimising cross current in class D amplifiers and simultaneously minimising the harmonic distortion. The method overcomes the problem of using the limited speed voltage comparators often used in cross current preventing circuits. The method is based on introducing of a replica amplifier with a current sensor matched to a main amplifier. The duration of the sensed cross current is compared by a current comparator with a small enough reference current. The comparator output generates a pulse with duration equal to the duration of the cross current event in the replica amplifier. The duration of that pulse is measured and used to generate dead time pulse, blanking amplifier pre-driver inputs.

Description

technical field [0001] The present invention relates to a method of minimizing cross current in a class D amplifier. More specifically, the proposed method is based on defining the dead time using a replica amplifier. The invention also relates to corresponding modules capable of carrying out the method and a computer program product comprising instructions for carrying out the steps of the method. Background technique [0002] A Class D amplifier, also known as a switching amplifier, is an electronic amplifier that uses a switching pattern, such as a switch of a transistor, to regulate power output. Class D amplifiers are preferred for many applications due to their high power efficiency. [0003] Switching amplifiers usually contain a push-pull output stage with large-sized transistors. A typical problem is cross current, also known as shoot-through current, through the upper and lower sides of the amplifier. Typically each side includes only n-type or p-type Metal Oxi...

Claims

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Application Information

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IPC IPC(8): H03F3/217
CPCH03F3/217
Inventor 奈代尔科·斯拉沃夫
Owner ST ERICSSON SA