Power amplification device and method

Patent metadata

Field	Value
Publication number	US-2016248381-A1
Application number	US-201415030941-A
Country	US
Kind code	A1
Filing date	Sep 29, 2014
Priority date	Oct 23, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

Various embodiments of the present invention relate to a power amplification device and method, wherein the power amplification device can comprise: a power amplifier; a switch mode converter for controlling a bias of the power amplifier; a comparator for providing a switching signal to the switch mode converter according to an envelope signal; and a control unit for determining whether a switching frequency of the switch mode converter is within a specific band and applying an offset to the switching frequency so as to deviate from the specific band if the switching frequency of the switch mode converter is within the specific band. Various other embodiments can be carried out.

First claim

1 . A method comprising:
determining whether a switching frequency of a switch mode converter is included in a reception band; and applying an offset to the switching frequency to allow the switching frequency to escape from the reception band when the switching frequency of the switch mode converter is included in a reception specific band.

2 . The method of claim 1 , wherein the switching frequency of the switch mode converter is changed based on an input signal or a reference voltage of a comparator supplying a switching signal to the switch mode converter.

3 . The method of claim 1 , wherein the input signal of the comparator is distributed by a variable resistance of an input terminal.

4 . The method of claim 2 , wherein the comparator is configured by a Schmidt trigger circuit and the reference voltage of the comparator includes one of a first reference voltage changing from high to low and a second reference voltage changing from low to high.

5 . The method of claim 1 , wherein the switching signal is a pulse signal having a frequency spectrum similar to an envelope signal, and the switching frequency is changed by changing a number of times of turning on/off during a predetermined time.

6 . The method of claim 1 , further comprising:
determining whether a bias voltage corresponding to the envelope signal is provided to the power amplifier by the switch mode converter before determining whether the switching frequency of the switch mode converter is included in the reception band.

7 . The method of claim 6 , wherein the determining of whether the bias voltage corresponding to the envelope signal in the switch mode converter is provided to the power amplifier comprises: determining whether a baseband signal corresponds to a voice signal; and determining whether a band of the baseband signal is smaller than a threshold value.

8 . An electronic device comprising:
a power amplifier; a switch mode converter configured to control a bias voltage of the power amplifier; a comparator configured to provide a switching signal to the switch mode converter based on an envelope signal; and a controller configured to determine whether a switching frequency of the switch mode converter is included in a reception band, and apply an offset to the switching frequency to allow the switching frequency to escape from the reception band when the switching frequency of the switch mode converter is included in the reception band.

9 . The electronic device of claim 8 , wherein the controller is configured to change the switching frequency of the switch mode converter by changing an input signal or a reference voltage of the comparator.

10 . The electronic device of claim 8 , further comprising:
a variable resistance unit that is connected to an input of the comparator and distributes an input voltage.

11 . The electronic device of claim 8 , wherein the comparator is configured by a Schmidt trigger circuit and the reference voltage of the comparator includes a first reference voltage changing from high to low and a second reference voltage changing from low to high.

12 . The electronic device of claim 9 , wherein the switching signal is a pulse signal having a frequency spectrum similar to an envelope signal, and the switching frequency is changed by changing a number of times of turning on/off during a predetermined time.

13 . The electronic device of claim 9 , wherein the controller determines whether a multiplied frequency of a switching frequency of the switch mode converter is included in the reception band when a bias voltage corresponding to the envelope signal is provided to the power amplifier by the switch mode converter, and applies the offset to the switching frequency to allow the switching frequency to escape from the reception band when the multiplied frequency of the switching frequency of the switch mode converter is included in the reception band.

14 . The electronic device of claim 9 , wherein the controller determines whether a baseband signal corresponds to a voice signal or whether a band of the baseband signal is smaller than a threshold value so as to determine whether the bias voltage corresponding to the envelope signal may be provided to the power amplifier by only the switch mode converter.

15 . The electronic device of claim 9 , further comprising:
a linear amplifier that compensates for an error when a voltage difference between the envelope signal and an output signal of the switch mode converter is applied as the error.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Yang Dong-Il

Classifications

• H03F2200/555

  A voltage generating circuit being realised for biasing different circuit elements · CPC title

• H03F2200/78

  A comparator being used in a controlling circuit of an amplifier · CPC title

• H03F2200/102

  A non-specified detector of a signal envelope being used in an amplifying circuit · CPC title

• H03K3/0377

  Bistables with hysteresis, e.g. Schmitt trigger (non-regenerative amplitude discriminators G01R19/165) · CPC title

• H03F3/245

  with semiconductor devices only · CPC title