MOBILE COMMUNICATION TERMINAL HAVING CLOCK CONTROL FUNCTION AND CLOCK CONTROL METHOD FOR THE SAME

• US 20070263756A1
• Filed: 01/02/2007
• Published: 11/15/2007
• Est. Priority Date: 01/02/2006
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Shin, Sang
• Application Number:
  US11/619,169
• Publication Number:
  US 20070263756A1
• Time in Patent Office: Days
• US Class Current: 375/373
• CPC Class Codes: H04B 15/04 the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
• CPC Class Codes: H04B 2215/064 Reduction of clock or synthesizer reference frequency harmonics
• CPC Class Codes: H04B 2215/065 by changing the frequency of clock or reference frequency

Abstract

A mobile communication terminal having a clock control function and a clock control method for the same are provided. The terminal includes a first oscillator configured to produce a first clock having a frequency which is not affected by interference from a specific channel, a second oscillator configured to produce a second clock having a frequency different from the frequency of the first clock, and a mixer configured to mix the first clock and the second clock and output a third clock as the mixing result. This prevents channel interference when receiving signals through a specific channel.

Claims

1. A mobile communication terminal having a clock control function, the terminal comprising:

a first oscillator configured to produce a first clock having a frequency which is unaffected by interference from a specific channel;

a second oscillator configured to produce a second clock having a frequency different from the frequency of the first clock; and

a mixer configured to mix the first clock and the second clock and output a third clock as the mixing result.

2. The mobile communication terminal of claim 1, wherein the third clock has a frequency equal to the sum of the frequency of the first clock and the frequency of the second clock.

3. The mobile communication terminal of claim 1, further comprising:

a radio frequency (RF) communication module configured to communicate a wireless signal with a base station; and

a controller configured to control an operation associated with the communication of the wireless signal,

wherein the mixer includes a first mixer and a second mixer, each of the first mixer and a second mixer mixes the first and second clocks and outputs a third clock as the mixing result.

4. The mobile communication terminal of claim 3, wherein the first mixer is included in the RF communication module.

5. The mobile communication terminal of claim 3, wherein the RF communication module uses, as a main clock, the third clock output from the first mixer, and the controller uses, as a main clock, the third clock output from the second mixer.

6. The mobile communication terminal of claim 1, further comprising:

a broadcast receiving module configured to receive a broadcast signal through a broadcast channel; and

a controller configured to control an operation associated with the reception of the broadcast signal,

wherein the mixer includes a first mixer and a second mixer, each of the first mixer and a second mixer mixes the first and second clocks and outputs a third clock as the mixing result.

7. The mobile communication terminal of claim 6, wherein the first mixer is included in the broadcast receiving module.

8. The mobile communication terminal of claim 6, wherein the broadcast receiving module uses, as a main clock, the third clock output from the first mixer, and the controller uses, as a main clock, the third clock output from the second mixer.

9. The mobile communication terminal of claim 1, wherein the frequency of the first clock is higher than the frequency of the second clock.

10. The mobile communication terminal of claim 1, wherein, in a global system for mobile communications (GSM), the frequency of the first clock is 12.967232 MHz, the frequency of the second clock is 32.768 KHz, and the frequency of the third clock is 13.000 MHz.

11. The mobile communication terminal of claim 1, wherein, in a terrestrial digital multimedia broadcasting (TDMB) system, the frequency of the first clock is 16 MHz, the frequency of the second clock is 384 KHz, and the frequency of the third clock is 16.384 MHz.

12. The mobile communication terminal of claim 1, wherein the frequency of the specific channel is not equal to the frequency of the first clock or the frequency of the second clock, which is multiplied by an integer, and is equal to a frequency of the third clock multiplied by an integer.

13. A clock control method for a mobile communication terminal, the method comprising:

producing a first clock having a frequency which is unaffected by interference from a specific channel;

producing a second clock having a frequency different from the frequency of the first clock; and

mixing the first clock and the second clock and outputting a third clock as the mixing result.

14. The clock control method of claim 13, wherein the third clock has a frequency equal to the sum of the frequency of the first clock and the frequency of the second clock.

15. The clock control method of claim 13, wherein the clock control method is implemented in at least one of a wireless communication system and a broadcast system.

16. The clock control method of claim 13, further comprising receiving a wireless signal using the third clock as a main clock.

17. The clock control method of claim 16, wherein mixing the first and second clocks and outputting the third clock includes mixing the first clock and the second clock in a module that receives the wireless signal and outputting the third clock.

18. The clock control method of claim 13, further comprising receiving a broadcast signal through a broadcast channel using the third clock as a main clock.

19. The clock control method of claim 18, wherein mixing the first and second clocks and outputting the third clock includes mixing the first clock and the second clock in a module that receives the broadcast signal and outputting the third clock.

20. The clock control method of claim 13, wherein a frequency of the specific channel is not equal to the frequency of the first clock or the frequency of the second clock, which is multiplied by an integer, and is equal to a frequency of the third clock multiplied by an integer.