TRANSMITTER BUILT-IN PRODUCTION LINE TESTING UTILIZING DIGITAL GAIN CALIBRATION
First Claim
1. A method of calibrating an external power amplifier comprising a power detector, said external power amplifier coupled to the output of a transmitter incorporating a pre-power amplifier (PPA), said method comprising the steps of:
- performing closed loop calibration of an input signal to yield a maximum level of said external power amplifier that is within predetermined transmission requirements;
measuring a gain of said external power amplifier; and
calibrating said power detector gain.
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Accused Products
Abstract
A novel and useful self-calibration based production line testing mechanism utilizing built-in closed loop measurements in the radio to calibrate the output power of an external power amplifier coupled to a SoC radio. The mechanism is applicable during production line testing and calibration which is performed on each SoC and associated external power amplifier after assembly at the target PCB of the final product. The mechanism calibrates the TX output power in three phases based on loopback EVM measurements. In a first phase, the PPA in the radio (SoC) is calibrated and gain versus output power is stored in a gain table in on-chip NVS. In a second phase, the maximum PPA TX power is determined using closed loop EVM measurements. The external PA is calibrated in a third phase and the maximum PA power is determined. During this third phase, the maximum power of the device is calculated, compared to the requirements of the particular standard and a pass/fail determination is thereby made.
51 Citations
25 Claims
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1. A method of calibrating an external power amplifier comprising a power detector, said external power amplifier coupled to the output of a transmitter incorporating a pre-power amplifier (PPA), said method comprising the steps of:
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performing closed loop calibration of an input signal to yield a maximum level of said external power amplifier that is within predetermined transmission requirements; measuring a gain of said external power amplifier; and calibrating said power detector gain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of calibrating an external power amplifier utilizing a transmitter incorporating a pre-power amplifier (PPA), said method comprising the steps of:
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determining a maximum PPA codeword that yields maximum output power of said external power amplifier (PA) while meeting predetermined transmission requirements and translating said maximum PPA codeword into a maximum PPA output power level utilizing a PPA gain table generated previously; and measuring power amplifier gain by injecting signals with known PPA output power into said external power amplifier, calculating a maximum power amplifier output power level as a function of said maximum PPA output power level and adjusting said maximum PPA codeword to meet said predetermined transmission requirements. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of calibrating an external power amplifier utilizing a transmitter incorporating a pre-power amplifier (PPA), said method comprising the steps of:
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injecting samples into a transmit path; downconverting and demodulating a receive signal leaked through said external power amplifier; increasing transmit power of said PPA until a maximum power amplifier output level is reached that still meets said predetermined transmission requirements; translating said maximum PPA codeword into a maximum PPA output power level utilizing a PPA gain table generated previously; injecting signals into said transmit path with known PPA output power and determining a gain of said external power amplifier; calculating a maximum power amplifier output power level as a function of said maximum PPA output power level; and adjusting said maximum PPA codeword to meet said predetermined transmission requirements. - View Dependent Claims (17, 18, 19)
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20. An apparatus, comprising:
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a transmitter incorporating a pre-power amplifier (PPA); a receiver, wherein said transmitter and said receiver are capable of operating simultaneously; a processor coupled to said transmitter and said receiver, said processor comprising program code means for calibrating an external power amplifier coupled to said transmitter when executed on said processor;
said program code means adapted to;determine a maximum PPA codeword that yields maximum output power of said external power amplifier (PA) while meeting predetermined transmission requirements and translate said maximum PPA codeword into a maximum PPA output power level utilizing a PPA gain table generated previously; and measure power amplifier gain by injecting signals with known PPA output power into said external power amplifier, calculate a maximum power amplifier output power level as a function of said maximum PPA output power level and adjust said maximum PPA codeword to meet said predetermined transmission requirements. - View Dependent Claims (21, 22)
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23. A single chip radio, comprising:
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a transmitter incorporating a pre-power amplifier (PPA); a receiver capable of receiving while said transmitter is transmitting; memory storage coupled to said transmitter; a processor coupled to said transmitter and said receiver, said processor comprising program code means for operative to calibrate an external power amplifier coupled to said transmitter when executed on said processor;
said program code means adapted to;inject samples from said memory storage into a transmit path; downconvert and demodulate a receive signal leaked through said external power amplifier; increase the transmit power of said PPA until a maximum power amplifier output level is reached that still meets said predetermined transmission requirements; translate said maximum PPA codeword into a maximum PPA output power level utilizing a PPA gain table generated previously; inject signals stored in said memory storage into said transmit path with known PPA output power and determine a gain of said external power amplifier; calculate a maximum power amplifier output power level as a function of said maximum PPA output power level; and adjust said maximum PPA codeword to meet said predetermined transmission requirements. - View Dependent Claims (24, 25)
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Specification