ELECTRONIC APPARATUS HAVING SIGNAL PROCESSING CIRCUIT SELECTIVELY ENTERING POWER SAVING MODE ACCORDING TO OPERATION STATUS OF RECEIVER LOGIC AND RELATED METHOD THEREOF

• US 20090138735A1
• Filed: 11/28/2007
• Published: 05/28/2009
• Est. Priority Date: 11/28/2007
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Chiou, Hsien-Chyi, Cheng, Ann-Tzung, Tai, Chih-Ju
• Granted Patent: US 8,024,588 B2
• Time in Patent Office: Days
• US Class Current: 713/320
• CPC Class Codes: G01S 19/09 providing processing capability normally carried out by the receiver
• CPC Class Codes: G01S 19/34 Power consumption

Abstract

An electronic apparatus with power saving functionality is disclosed. The electronic apparatus has a first signal processing circuit and a second signal processing circuit. The first signal processing circuit includes a receiver logic for processing at least a satellite signal generated from a global navigation satellite system (GNSS) to obtain resultant data; and a power saving determination logic for monitoring an operation status of the receiver logic and generating a first control signal according to the operation status. The second signal processing circuit includes a processing logic for receiving the resultant data from the receiver logic for further signal processing; and a power saving trigger logic for controlling the processing logic to enter a power saving mode from a normal mode when receiving the first control signal from the power saving control logic.

Claims

1. An electronic apparatus with power saving functionality, comprising:

a first signal processing circuit, comprising;

a receiver logic, for processing at least a satellite signal generated from a global navigation satellite system (GNSS) to obtain resultant data; and

a power saving determination logic, coupled to the receiver logic, for monitoring an operation status of the receiver logic and generating a first control signal according to the operation status; and

a second signal processing circuit, coupled to the first signal processing circuit, comprising;

a processing logic, for receiving the resultant data from the receiver logic for further signal processing; and

a power saving trigger logic, coupled to the processing logic, for controlling the processing logic to enter a power saving mode from a normal mode when receiving the first control signal from the power saving control logic, wherein the processing logic operating in the power saving mode has less power consumption than the processing logic operating in the normal mode.

2. The electronic apparatus of claim 1, wherein the power saving determination logic further monitors the operation status of the receiver logic to generate a second control signal;

and the power saving trigger logic controls the processing logic to enter the normal mode from the power saving mode when receiving the second control signal from the power saving determination logic.

3. The electronic apparatus of claim 2, wherein the first signal processing circuit further comprises a first communication interface;

the second signal processing circuit further comprises a second communication interface for communicating with the first communication interface; and

after receiving the first control signal transmitted from the first communication interface, the second communication interface enters a second operation mode from a first operation mode to monitor if the second control signal is transmitted from the first communication interface, where the second communication interface operating in the second operation mode has less power consumption than the second communication interface operating in the first operation mode.

4. The electronic apparatus of claim 1, wherein the receiver logic transmits the resultant data to the processing logic only when receiving a request command generated from the processing logic.

5. The electronic apparatus of claim 4, wherein the processing logic generates the request command periodically.

6. The electronic apparatus of claim 1, wherein the receiver logic processes a plurality of satellite signals generated from the global navigation satellite system and obtains the resultant data containing positioning information;

and the processing logic of the second signal processing circuit performs a navigation function according to the positioning information received from the receiver logic.

7. The electronic apparatus of claim 1, wherein the receiver logic processes a plurality of satellite signals and obtains the resultant data containing demodulation data;

and the processing logic of the second signal processing circuit computes positioning information according to the demodulation data received from the receiver logic.

8. The electronic apparatus of claim 7, wherein the processing logic further performs a navigation function according to the positioning information.

9. An electronic apparatus, comprising:

a receiver logic, for processing at least a satellite signal generated from a global navigation satellite system (GNSS) to obtain resultant data; and

a processing logic, for receiving the resultant data from the receiver logic for further signal processing, wherein the receiver logic transmits the resultant data to the processing logic only when receiving a request command generated from the processing logic.

10. The electronic apparatus of claim 9, wherein the processing logic generates the request command periodically.

11. A signal processing method, comprising:

(a) processing at least a satellite signal generated from a global navigation satellite system (GNSS) to obtain resultant data;

(b) monitoring an operation status of step (a), and generating a first control signal according to the operation status;

(c) utilizing a processing logic to receive the resultant data for further signal processing; and

(d) controlling the processing logic to enter a power saving mode from a normal mode when receiving the first control signal;

wherein the processing logic operating in the power saving mode has less power consumption than the processing logic operating in the normal mode.

12. The signal processing method of claim 11, further comprising:

monitoring the operation status of step (a) to generate a second control signal; and

controlling the processing logic to enter the normal mode from the power saving mode when receiving the second control signal.

13. The signal processing method of claim 12, wherein the signal processing logic receives the resultant data outputted from a first communication interface through a second communication interface communicating with the first communication interface;

and the signal processing method further comprises;

after the first control signal is transmitted from the first communication interface, controlling the second communication interface to enter a second operation mode from a first operation mode to monitor if the second control signal is transmitted from the first communication interface, where the second communication interface operating in the second operation mode has less power consumption than the second communication interface operating in the first operation mode.

14. The signal processing method of claim 11, wherein the processing logic receives the resultant data only after generating a request command for the resultant data.

15. The signal processing method of claim 14, wherein the processing logic generates the request command periodically.

16. The signal processing method of claim 11, wherein step (a) comprises processing a plurality of satellite signals to obtain the resultant data containing positioning information;

and step (c) comprises utilizing the processing logic to perform a navigation function according to the positioning information.

17. The signal processing method of claim 11, wherein step (a) comprises processing a plurality of satellite signals to obtain the resultant data containing demodulation data;

and step (c) comprises utilizing the processing logic to compute positioning information according to the demodulation data.

18. The signal processing method of claim 17, wherein step (c) further comprises utilizing the processing logic to perform a navigation function according to the positioning information.

19. A signal processing method, comprising:

processing at least a satellite signal generated from a global navigation satellite system (GNSS) to obtain resultant data; and

receiving the resultant data for further signal processing only after generating a request command for the resultant data.

20. The signal processing method of claim 19, wherein the request command is generated periodically.