Control of a transmitter output power

• US 9,142,877 B2
• Filed: 06/29/2012
• Issued: 09/22/2015
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Plevridis, Sofoklis, Karakasiliotis, Anastasios, Kuzhipatt, Radhakrishnan, Xie, Kai
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US13/537,331
• Publication Number:
  US 20130260816A1
• Time in Patent Office: 1,180 Days
• US Class Current: 1/1
• CPC Class Codes: G01C 21/26 specially adapted for navigation in a road network
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance
• CPC Class Codes: H04L 25/03038 with a non-recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

Disclosed are various embodiments for controlling an output power of a transmitter. Adjustment amounts for a transmitter to transmit at a desired power level are determined. For a predetermined time period, an actual power level of the transmitter is adjusted at a first adjustment rate. Upon an expiration of the predetermined time period, the actual power level is adjusted at a second adjustment rate, wherein the second adjustment rate is slower than the first adjustment rate.

Claims

1. A system, comprising:

transmitter circuitry configured to transmit data at a plurality of desired power levels;

detector circuitry configured to obtain a signal corresponding to an actual transmit power level for transmitted data;

gain control circuitry configured to adjust the actual transmit power level based on the signal at a first adjustment rate for a predetermined time period in response to receiving a command to change to one of the desired power levels; and

the gain control circuitry configured to adjust the actual transmit power level based on the signal at a second adjustment rate upon an expiration of the predetermined time period, wherein adjusting the actual transmit power level at the first and the second adjustment rates comprises updating gain signals at a first and a second frequency.

2. The system of claim 1, wherein the predetermined time period further comprises a first time segment and a second time segment;

wherein the gain control circuitry is further configured to;

adjust a digital gain at a first rate for the first time segment;

adjust an analog gain for the first time segment;

adjust the digital gain at a second rate for the second time segment, the second rate being faster than the first rate; and

maintain the analog gain at a fixed level for the second time segment.

3. The system of claim 2, wherein the gain control circuitry is further configured to adjust the digital gain at a third rate, the third rate being slower than the first adjustment rate.

4. The system of claim 1, wherein the transmitter circuitry is configured to disable a power adjustment in response to receiving the command to change to one of the desired power levels and prior to an initiation of the predetermined time period.

5. The system of claim 1, wherein the transmitter circuitry is configured to stop an adjustment of the actual transmit power level upon obtaining the command to switch to a decreased desired power level, the command being obtained from a base station.

6. The system of claim 5, wherein the transmitter circuitry is configured to initiate the adjustment of the actual transmit power level upon obtaining the command to switch to an increased desired power level, the command being obtained from the base station.

7. An apparatus, comprising:

gain control circuitry configured to adjust an actual transmit power level of a transmitter at a first adjustment rate for a predetermined time period in response to receiving a command to change a desired power level; and

the gain control circuitry further configured to adjust the actual transmit power level of the transmitter at a second adjustment rate upon an expiration of the predetermined time period, wherein adjusting the actual transmit power level at the first and the second adjustment rates comprises updating gain signals at a first and a second frequency.

8. The apparatus of claim 7, wherein the predetermined time period further comprises a first time segment and a second time segment;

wherein the gain control circuitry is further configured to;

adjust a digital gain of the transmitter at a first rate during the first time segment;

adjust an analog gain of the transmitter during the first time segment;

adjust the digital gain of the transmitter at a second rate during the second time segment, the second rate being faster than the first rate; and

maintain the analog gain of the transmitter at a fixed level during the second time segment.

9. The apparatus of claim 8, further comprising transmitter circuitry configured to disengage a power adjustment in response to receiving the command to change the desired power level and prior to an initiation of the predetermined time period.

10. The apparatus of claim 7, wherein the predetermined time period is programmable.

11. The apparatus of claim 7, further comprising:

detector circuitry configured to obtain a reference signal and an power level signal for the transmitter;

the gain control circuitry configured to determine a plurality of adjustment amounts based on the reference signal and the power level signal; and

wherein the gain control circuitry is further configured to adjust the actual transmit power level based on the adjustment amounts.

12. The apparatus of claim 7, further comprising transmitter circuitry configured to stop an adjustment of the actual transmit power level upon obtaining the command to decrease the desired power level, the command being obtained from a base station.

13. The apparatus of claim 12, wherein the transmitter circuitry is configured to initiate the adjustment of the actual transmit power level upon obtaining the command to increase the desired power level, the command being obtained from the base station.

14. A method, comprising:

determining, in a circuit, a plurality of adjustment amounts for a transmitter to transmit at a desired power level;

adjusting, in the circuit, for a predetermined time period and at a first adjustment rate, an actual transmit power level of the transmitter based on a plurality of the adjustment amounts; and

upon an expiration of the predetermined time period, adjusting, in the circuit, at a second adjustment rate, the actual transmit power level based on a plurality of the adjustment amounts, the second adjustment rate being slower than the first adjustment rate, wherein adjusting the actual transmit power level at the first and the second adjustment rates comprises updating gain signals at a first and a second frequency.

15. The method of claim 14, wherein determining each of the adjustment amounts for the transmitter further comprises determining a difference between a reference signal and a power level signal for the transmitter.

16. The method of claim 14, wherein the predetermined time period further comprises a first time segment and a second time segment;

and

wherein adjusting for the predetermined time period at the first adjustment rate further comprises;

adjusting an analog gain during the first time segment;

adjusting a digital gain at a first rate during the first time segment;

maintaining the analog gain at a fixed level during the second time segment; and

adjusting the digital gain at a second rate during the second time segment, the second rate being faster than the first rate.

17. The method of claim 14, further comprising disabling a power adjustment in response to receiving a command to change the desired power level and prior to an initiation of the predetermined time period.

18. The method of claim 14, wherein adjusting for the predetermined time period at the first adjustment rate is initiated in response to obtaining a command from a base station to adjust the desired power level.

19. The method of claim 14, further comprising stopping an adjustment of the actual transmit power level upon obtaining a command to decrease the desired power level, the command being obtained from a base station.

20. The method of claim 19, further comprising initiating the adjustment of the actual transmit power level upon obtaining the command to increase the desired power level, the command being obtained from the base station.