Transmission power controller of a mobile communication terminal

• US 20050181740A1
• Filed: 02/11/2005
• Published: 08/18/2005
• Est. Priority Date: 02/12/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kwak, Soon-Hyeok
• Granted Patent: US 7,684,760 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table

Abstract

An apparatus for controlling transmission power of a mobile communication terminal. The apparatus comprises a central processing unit for measuring a power level of a received signal and determining a power amplification mode in response to the measured power level of the received signal and a power preset table, a driver amplifier for amplifying a transmission signal to produce an output signal, the driver amplifier has operating conditions chosen in accordance with the power amplification mode, a voltage converter for outputting a preset voltage value in accordance with the power amplification mode, and a power amplifier for amplifying the output signal of the driver amplifier in response to the outputted preset voltage value.

Claims

1. An apparatus for controlling transmission power of a mobile communication terminal, the apparatus comprising:

a central processing unit for measuring a power level of a received signal and determining a power amplification mode in response to the measured power level of the received signal and a power preset table;

a driver amplifier for amplifying a transmission signal to produce an output signal, the driver amplifier has operating conditions chosen in accordance with the power amplification mode;

a voltage converter for outputting a preset voltage value in accordance with the power amplification mode; and

a power amplifier for amplifying the output signal of the driver amplifier in response to the outputted preset voltage value.

2. The apparatus of claim 1, wherein the central processing unit comprises a memory for storing the power preset table.

3. The apparatus of claim 2, wherein the power preset table comprises information for the power amplification mode.

4. The apparatus of claim 3, wherein the information for the power amplification mode comprises at least one of a gain value of the driver amplifier, a voltage control factor, and an applied voltage value and a gain factor for the power amplifier.

5. The apparatus of claim 4, wherein the voltage control factor is a preset digital value.

6. The apparatus of claim 5, wherein the preset digital value comprises at least two bits.

7. The apparatus of claim 5, wherein the power amplification mode comprises one of four different modes.

8. The apparatus of claim 4, wherein the gain factor for the power amplifier is one of a high gain mode and a low gain mode.

9. The apparatus of claim 1, wherein the voltage converter is a DC/DC converter.

10. A method for controlling transmission power of a mobile terminal, the method comprising:

measuring a power level of a received signal;

determining a power amplification mode in response to the measured power level of the received signal and a power preset table;

amplifying a transmission signal in accordance with the power amplification mode to produce an output transmission signal;

outputting a preset voltage value in accordance with the power amplification mode; and

amplifying the output transmission signal in accordance with the outputted preset voltage value.

11. The method of claim 10, wherein the power preset table comprises information for the power amplification mode.

12. The method of claim 11, wherein the information of the power amplification mode comprises at least one of a gain value of the driver amplifier, a voltage control factor, and an applied voltage value and a gain factor of the power amplifier.

13. The method of claim 12, wherein the voltage control factor is a preset digital value.

14. The method of claim 13, wherein the preset digital value comprises at least two bits.

15. The method of claim 10, wherein the power amplification mode comprises one of four different modes.

16. The method of claim 12, wherein the gain factor for the power amplifier is one of a high gain mode and a low gain mode.

17. The method of claim 10, wherein the voltage converter is a DC/DC converter.