Envelope tracking RF transmitter calibration
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United States of America Patent
Stats
-
Oct 17, 2017
Issued Date -
Nov 12, 2015
app pub date -
May 5, 2015
filing date -
May 8, 2014
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
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.
First Claim
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International Classification(s)
Cited Art Landscape
| Patent Info | (Count) | # Cites | Year |
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| * 6765436 Power supply based audio compression for digital audio amplifier | 15 | 2002 | |
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| * 2011/0122,919 SYNCHRONISING A RECEIVER TO A SIGNAL HAVING KNOWN STRUCTURE | 1 | 2008 | |
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| * 2009/0302,941 Joint optimisation of supply and bias modulation | 30 | 2007 | |
| * 2012/0200,354 APPARATUS AND METHODS FOR ENVELOPE TRACKING CALIBRATION | 89 | 2012 | |
| * 2012/0229,208 Power Control | 7 | 2012 | |
| * 2014/0179,250 TIME ALIGNMENT FOR AN AMPLIFICATION STAGE | 6 | 2012 | |
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| * 2009/0045,872 INTEGRATED TRANSCEIVER WITH ENVELOPE TRACKING | 56 | 2008 | |
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| * 2014/0099,907 RUGGED IQ RECEIVER BASED RF GAIN MEASUREMENTS | 42 | 2012 | |
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| * 2014/0057,684 POWER LOOP CONTROL BASED ENVELOPE TRACKING | 56 | 2013 | |
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| 2011/0274,210 TIME ALIGNMENT ALGORITHM FOR TRANSMITTERS WITH EER/ET AMPLIFIERS AND OTHERS | 3 | 2011 | |
| 2013/0235,949 APPARATUS AND METHOD FOR TIME ALIGNMENT OF AN ENVELOPE TRACKING POWER AMPLIFIER | 6 | 2012 | |
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| 2012/0326,777 AMPLIFIER CIRCUIT AND RADIO COMMUNICATION APPARATUS | 1 | 2010 | |
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| * 2010/0060,358 Compensating for variations in the response of a power supply | 11 | 2008 | |
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| * 2015/0280,674 APPARATUS AND METHOD FOR AMPLIFYING A TRANSMIT SIGNAL OR FOR DETERMINING VALUES OF A DELAY CONTROL PARAMETER | 6 | 2015 | |
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| * 2015/0126,141 Adaptive ISO-Gain Pre-Distortion for an RF Power Amplifier Operating in Envelope Tracking | 3 | 2013 | |
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| 2013/0076,418 System and Method for Calibration of Timing Mismatch for Envelope Tracking Transmit Systems | 13 | 2011 | |
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| * 7602244 Power amplifier bias synchronization | 10 | 2007 | |
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| * 2015/0017,933 TRANSMITTER AND METHOD WITH RF POWER AMPLIFIER HAVING CONTROL LOOP STABILIZED BIAS | 3 | 2013 | |
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| * 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 | |
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| * 2016/0142,078 ENVELOPE SHAPING IN ENVELOPE TRACKING POWER AMPLIFICATION | 1 | 2014 | |
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| * 2007/0015,474 Data processing method, transmitter, device, network element and base station | 3 | 2006 | |
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| * 2014/0155,128 Unequal Amplifier Gain Compression Via Shaping Table | 4 | 2013 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Apr 17, 2021 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Apr 17, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Apr 17, 2029 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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