Envelope tracking RF transmitter calibration

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United States of America Patent

PATENT NO 9794006
APP PUB NO 20150326327A1
SERIAL NO

14704122

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Abstract

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An envelope tracking RF transmitter calibration procedure calculates both a supply voltage to apply to a power amplifier for a modulated signal envelope to achieve ISO-gain, and a timing delay adjustment to time-align the applied supply voltage and the modulated signal to minimize distortion due to time delay error. An ISO-gain surface is calculated, as a function of the envelope of a modulated signal and the power amplifier supply voltage, for each of a plurality of desired gain values. As the envelope is swept through a predetermined range of values, demodulated outputs at predetermined points are sampled, and a set of non-linear functions relating the supply voltage to the envelope, which achieve the desired gain at the sampled points, are derived, using surface interpolation between the predetermined gain surface points. Data defining the functions are stored for use during transmitter operation. Distortion components in the transmitter output are detected, and are separated into even components representing time delay error distortion, and odd components representing transmitter saturation distortion. A timing delay value is calculated that minimizes the time delay error distortion.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)STOCKHOLM12205

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Cited Art Landscape

Patent Info (Count) # Cites Year
 
CIRRUS LOGIC, INC. (1)
* 6765436 Power supply based audio compression for digital audio amplifier 15 2002
 
QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD. (1)
* 2011/0122,919 SYNCHRONISING A RECEIVER TO A SIGNAL HAVING KNOWN STRUCTURE 1 2008
 
SNAPTRACK, INC. (4)
* 2009/0302,941 Joint optimisation of supply and bias modulation 24 2007
* 2012/0200,354 APPARATUS AND METHODS FOR ENVELOPE TRACKING CALIBRATION 75 2012
* 2012/0229,208 Power Control 6 2012
* 2014/0179,250 TIME ALIGNMENT FOR AN AMPLIFICATION STAGE 5 2012
 
COMMSCOPE TECHNOLOGIES LLC (1)
* 2009/0045,872 INTEGRATED TRANSCEIVER WITH ENVELOPE TRACKING 48 2008
 
QUANTANCE, INC. (1)
* 2007/0184,793 RF Power Amplifier Controller Circuit With Compensation For Output Impedance Mismatch 31 2007
 
QORVO US, INC. (3)
* 2014/0099,907 RUGGED IQ RECEIVER BASED RF GAIN MEASUREMENTS 34 2012
* 2012/0306,572 METHOD OF POWER AMPLIFIER CALIBRATION FOR AN ENVELOPE TRACKING SYSTEM 8 2012
* 2014/0057,684 POWER LOOP CONTROL BASED ENVELOPE TRACKING 41 2013
 
SAMSUNG ELECTRONICS CO., LTD. (2)
2011/0274,210 TIME ALIGNMENT ALGORITHM FOR TRANSMITTERS WITH EER/ET AMPLIFIERS AND OTHERS 2 2011
2013/0235,949 APPARATUS AND METHOD FOR TIME ALIGNMENT OF AN ENVELOPE TRACKING POWER AMPLIFIER 4 2012
 
SUMITOMO ELECTRIC INDUSTRIES, LTD. (1)
2012/0326,777 AMPLIFIER CIRCUIT AND RADIO COMMUNICATION APPARATUS 1 2010
 
NOKIA TECHNOLOGIES OY (1)
* 2010/0060,358 Compensating for variations in the response of a power supply 10 2008
 
InterDigital Technology Corporation (1)
* 2006/0050,810 Hybrid transmitter architecture having high efficiency and large dynamic range 10 2005
 
INTEL IP CORPORATION (2)
* 2015/0280,674 APPARATUS AND METHOD FOR AMPLIFYING A TRANSMIT SIGNAL OR FOR DETERMINING VALUES OF A DELAY CONTROL PARAMETER 4 2015
* 2016/0182,100 CIRCUIT AND METHOD FOR PROVIDING A RADIO FREQUENCY SIGNAL 1 2015
 
STMICROELECTRONICS INTERNATIONAL N.V. (1)
* 2015/0126,141 Adaptive ISO-Gain Pre-Distortion for an RF Power Amplifier Operating in Envelope Tracking 2 2013
 
INTEL MOBILE COMMUNICATIONS GMBH (1)
2013/0076,418 System and Method for Calibration of Timing Mismatch for Envelope Tracking Transmit Systems 12 2011
 
APPLE INC. (1)
* 7602244 Power amplifier bias synchronization 9 2007
 
CRESTCOM, INC. (1)
* 2015/0017,933 TRANSMITTER AND METHOD WITH RF POWER AMPLIFIER HAVING CONTROL LOOP STABILIZED BIAS 2 2013
 
INTEL CORPORATION (2)
* 2016/0164,550 ENVELOPE TRACKING PATH DELAY FINE TUNING AND CALIBRATION 1 2014
* 2016/0173,030 Method and Apparatus for Correcting Inconvenient Power Amplifier Load Characteristics in an Envelope Tracking Based System 2 2014
 
MICROSOFT TECHNOLOGY LICENSING, LLC (1)
* 2016/0142,078 ENVELOPE SHAPING IN ENVELOPE TRACKING POWER AMPLIFICATION 1 2014
 
NOKIA SOLUTIONS AND NETWORKS OY (1)
* 2007/0015,474 Data processing method, transmitter, device, network element and base station 3 2006
 
AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (1)
* 2014/0155,128 Unequal Amplifier Gain Compression Via Shaping Table 3 2013
* Cited By Examiner

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