SPS receiver with adjustable linearity

• US 9,154,088 B2
• Filed: 12/12/2013
• Issued: 10/06/2015
• Est. Priority Date: 02/27/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xu, Yang, Pals, Timothy Paul, Wang, Kevin Hsi Huai
• Primary Examiner(s): Le, Lana N
• Application Number:
  US14/105,126
• Publication Number:
  US 20140099885A1
• Time in Patent Office: 663 Days
• Field of Search: 455/12.1, 455/13.4, 4555521-5531
• US Class Current: 1/1
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: G01S 19/36 relating to the receiver frond end
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/223 with MOSFET's
• CPC Class Codes: H03F 1/3205 in field-effect transistor amplifiers
• CPC Class Codes: H03F 3/04 with semiconductor devices only
• CPC Class Codes: H03F 3/19 with semiconductor devices only
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 2001/045 with means for improving efficiency
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of selecting a mode for an SPS receiver includes selecting either a first mode or a second mode for the SPS receiver based on a comparison between an output power of a communications transceiver and a mode switch point wherein the mode switch point is a power value. The first mode corresponds to a first bias current value of the SPS receiver, the second mode corresponds to a second bias current value of the SPS receiver, and the first bias current value is different from the second bias current value.

Claims

1. A method of selecting a mode for an SPS receiver, the method comprising:

selecting either a first mode or a second mode for the SPS receiver based on a comparison between an output power of a communications transceiver and at least one mode switch point wherein the at least one mode switch point is a power value;

transitioning from selecting the first mode for the SPS receiver to selecting the second mode for the SPS receiver based on the output power of the communications transceiver rising above a first mode switch point; and

transitioning from selecting the second mode for the SPS receiver to selecting the first mode for the SPS receiver based on the output power dropping below a second mode switch point, the second mode switch point being lower than the first mode switch point,

wherein the first mode corresponds to a first bias current value of the SPS receiver, the second mode corresponds to a second bias current value of the SPS receiver, and the first bias current value is different from the second bias current value.

2. The method of claim 1 further comprising determining the mode switch point based on a communications network environment of a mobile device.

3. The method of claim 2 further comprising determining the mode switch point based on a probability density function of the output power.

4. The method of claim 1 further comprising performing polling, wherein polling comprises comparing the output power of the communications transceiver at particular time intervals with at least one of the first mode switch point or the second mode switch point.

5. A mobile device comprising:

a communications transceiver;

a satellite positioning system (SPS) receiver; and

a processor configured to;

select either a first mode or a second mode for the SPS receiver based on a comparison between an output power of the communications transceiver and at least one mode switch point wherein the at least one mode switch point is a power value;

transition from selecting the first mode for the SPS receiver to selecting the second mode for the SPS receiver based on the output power of the communications transceiver rising above a first mode switch point; and

transition from selecting the second mode for the SPS receiver to selecting the first mode for the SPS receiver based on the output power dropping below a second mode switch point, the second mode switch point being lower than the first mode switch point,

wherein the first mode corresponds to a first bias current value of the SPS receiver, the second mode corresponds to a second bias current value of the SPS receiver, and the first bias current value is different from the second bias current value.

6. The mobile device of claim 5 wherein the processor is further configured to determine the mode switch point based on a communications network environment of the mobile device.

7. The mobile device of claim 6 wherein the processor is further configured to determine the mode switch point based on a probability density function of the output power.

8. The mobile device of claim 5 wherein the processor is further configured to perform polling wherein polling comprises comparing the output power of the communications transceiver at particular time intervals with at least one of the first mode switch point or the second mode switch point.

9. An apparatus for selecting a mode for an SPS receiver, the apparatus comprising:

means for selecting either a first mode or a second mode for the SPS receiver based on a comparison between an output power of a communications transceiver and at least one mode switch point wherein the at least one mode switch point is a power value;

means for transitioning from selecting the first mode for the SPS receiver to selecting the second mode for the SPS receiver based on the output power of the communications transceiver rising above a first mode switch point; and

means for transitioning from selecting the second mode for the SPS receiver to selecting the first mode for the SPS receiver based on the output power dropping below a second mode switch point, the second mode switch point being lower than the first mode switch point,

wherein the first mode corresponds to a first bias current value of the SPS receiver, the second mode corresponds to a second bias current value of the SPS receiver, and the first bias current value is different from the second bias current value.

10. The apparatus of claim 9 further comprising means for determining the mode switch point based on a communications network environment of a mobile device.

11. The apparatus of claim 10 further comprising means for determining the mode switch point based on a probability density function of the output power.

12. The apparatus of claim 9 further comprising means for performing polling wherein polling comprises comparing the output power of the communications transceiver at particular time intervals with at least one of the first mode switch point or the second mode switch point.

13. An article comprising at least one non-transitory processor-readable storage medium having stored thereon instructions executable by one or more processors to:

select either a first mode or a second mode for an SPS receiver based on a comparison between an output power of a communications transceiver and at least one mode switch point wherein the at least one mode switch point is a power value;

transition from selecting the first mode for the SPS receiver to selecting the second mode for the SPS receiver based on the output power of the communications transceiver rising above a first mode switch point; and

transition from selecting the second mode for the SPS receiver to selecting the first mode for the SPS receiver based on the output power dropping below a second mode switch point, the second mode switch point being lower than the first mode switch point,

wherein the first mode corresponds to a first bias current value of the SPS receiver, the second mode corresponds to a second bias current value of the SPS receiver, and the first bias current value is different from the second bias current value.

14. The article of claim 13 wherein the instructions executable by the one or more processors further comprise instructions to determine the mode switch point based on a communications network environment of a mobile device.

15. The article of claim 14 wherein the instructions executable by the one or more processors further comprise instructions to determine the mode switch point based on a probability density function of the output power.

16. The article of claim 13 wherein the instructions executable by the one or more processors further comprise instructions to perform polling wherein polling comprises comparing the output power of the communications transceiver at particular time intervals with at least one of the first mode switch point or the second mode switch point.