METHOD AND SYSTEM FOR TRANSMITTER OUTPUT POWER COMPENSATION

• US 20100189042A1
• Filed: 03/31/2010
• Published: 07/29/2010
• Est. Priority Date: 11/30/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Pan, Michael (Meng-An)
• Granted Patent: US 8,548,390 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 1/036 Cooling arrangements

Abstract

Aspects of compensating for transmitter output power may comprise sampling an on-chip transmitter circuit temperature at various time instants and determining a feedback temperature compensation value. At least one digital-to-analog converter may be adjusted by utilizing the feedback temperature compensation value, which may correspond to the sampled temperature. The digital-to-analog converter may be an I-component digital-to-analog converter and/or a Q-component digital-to-analog converter. At least a portion of the on-chip transmitter circuit may be characterized to determine power output dependence of the on-chip transmitter circuit on temperature variation of the on-chip transmitter circuit. Based on this characterization, a feedback temperature compensation value that may correspond to the sampled temperature may be used to adjust the digital-to-analog converter. The feedback temperature compensation value may be, for example, from a lookup table or an algorithm.

Claims

1-30. -30. (canceled)

31. A method for controlling an output of a wireless transmitter, comprising:

sampling a temperature of at least a portion of the wireless transmitter at a plurality of time instants, the temperature sampling being performed at a periodic rate, the periodic rate varying as a function of a rate of change of at least the sampled temperature;

determining a feedback temperature compensation value at one of the plurality of time instants; and

adjusting a bias current for one or more digital-to-analog converters of the wireless transmitter, the bias current adjusting using the determined feedback temperature compensation value, wherein the one or more digital-to-analog converters receive one or more digital intermediate frequency (IF) signals, wherein the determined feedback temperature compensation value corresponds to the sampled temperature.

32. The method according to claim 31, wherein the wireless transmitter comprises a transmitter front end and a baseband processor, and wherein the portion of the wireless transmitter that is temperature sampled is the transmitter front end.

33. The method according to claim 31, wherein the one or more digital-to-analog converters comprise an I-component digital-to-analog converter and a Q-component digital-to-analog converter.

34. The method according to claim 31, comprising characterizing at least a portion of the wireless transmitter to determine power output dependence of the wireless transmitter on temperature variation of the wireless transmitter.

35. The method according to claim 34, comprising generating a lookup table of feedback temperature compensation values corresponding to the sampled temperatures based on the characterization of at least the portion of the wireless transmitter.

36. The method according to claim 35, comprising acquiring the determined feedback temperature compensation value from the lookup table based on the sampled temperature.

37. The method according to claim 31, comprising the determined feedback temperature compensation value is calculated using a compensation algorithm, wherein a calculation of the determined feedback temperature compensation value uses at least an initial compensation value, the sampled temperature, an initial temperature and a scaling factor.

38. The method according to claim 31, comprising assigning a default value to the initial compensation value.

39. The method according to claim 31, comprising assigning a default value to the initial temperature.

40. The method according to claim 31, comprising assigning a default value to the scaling factor.

41. The method according to claim 31, wherein an output of one or more of the digital-to-analog converters is a desired value when the determined feedback temperature compensation value is equal to the initial compensation value and the sampled temperature is equal to the initial temperature.

42. The method according to claim 31, wherein the method is performed in a mobile wireless communication device.

43. The method according to claim 42, wherein the mobile wireless communication device has a transmit power specification of approximately 3 dBm.

44. The method according to claim 31, wherein the wireless transmitter is part of a mobile wireless communication device.

45. The method according to claim 44, wherein the mobile wireless communication device comprises a telephone.

46. The method according to claim 31, wherein the wireless transmitter is part of one or more of the following:

a telephone, a walkie-talkie and a personal digital assistant (PDA).

47. The method according to claim 31, wherein the wireless transmitter is part of a router in a home network.

48. The method according to claim 31, wherein the wireless transmitter is part of a mobile wireless communication device that participates in a cellular communication network.

49. The method according to claim 31, wherein the wireless transmitter is part of a wireless communication device that supports time-domain multiple access (TDMA) communications.

50. The method according to claim 31, wherein the wireless transmitter is part of a wireless communication device that supports code division multiple access (CDMA) communications.

58. The wireless communication device according to claim 50, wherein the mobile wireless communication device has a transmit power specification of approximately 3 dBm.

51. A wireless communication device, comprising:

a sensor circuit that samples a temperature of a wireless transmitter of the wireless communication device at a plurality of time instants; and

at least one digital-to-analog converter of the wireless transmitter, wherein a bias current for a particular digital-to-analog converter of the at least one digital-to-analog converter is adjusted via a feedback temperature compensation value at a particular time instant of the plurality of time instants, wherein the determined feedback temperature compensation value corresponds to the sampled temperature, wherein the at least one digital-to-analog converter receives a digital intermediate frequency (IF) signal.

52. The wireless communication device according to claim 51, wherein the at least one digital-to-analog converter comprises an I-component digital-to-analog converter and a Q-component digital-to-analog converter.

53. The wireless communication device according to claim 52, wherein at least a portion of the wireless transmitter is characterized to determine power output dependence of the wireless transmitter on temperature variation of the wireless transmitter.

54. The wireless communication device according to claim 53, comprising a lookup table of feedback temperature compensation values that corresponds to the sampled temperatures based on the characterization of the at least a portion of the wireless transmitter.

55. The wireless communication device according to claim 51, wherein the determined feedback temperature compensation value is calculated using a compensation algorithm that uses at least the following:

an initial compensation value, a present temperature, an initial temperature and a scaling factor.

56. The wireless communication device according to claim 55, wherein one or more default values are assigned to one or more of the following:

the initial compensation value, the present temperature, the initial temperature and the scaling factor

57. The wireless communication device according to claim 55, wherein an output of the digital-to-analog converter is a desired value when the determined feedback temperature compensation value is equal to the initial compensation value and the sampled temperature is equal to the initial temperature.

59. The wireless communication device according to claim 51, wherein the wireless transmitter comprises a transmitter front end and a baseband processor, and wherein the sensor circuit samples the temperature of the wireless transmitter at the transmitter front end.

60. The wireless communication device according to claim 51, wherein the wireless communication device is a mobile wireless communication device.

61. The wireless communication device according to claim 60, wherein the mobile wireless communication device comprises a telephone.

62. The wireless communication device according to claim 51, wherein the wireless transmitter is part of one or more of the following:

a telephone, a walkie-talkie and a personal digital assistant (PDA).

63. The wireless communication device according to claim 51, wherein the wireless transmitter is part of a router in a home network.

64. The wireless communication device according to claim 51, wherein the wireless communication device is a mobile wireless communication device that participates in a cellular communication network.

65. The wireless communication device according to claim 51, wherein the wireless communication device supports time-domain multiple access (TDMA) communications.

66. The wireless communication device according to claim 51, wherein the wireless communication device supports code division multiple access (CDMA) communications.