Circuit and method for compensating for nonliner distortion of power amplifier
Circuit and method for compensating for nonliner distortion of power amplifier
 CN 1,523,751 A
 Filed: 02/17/2004
 Published: 08/25/2004
 Est. Priority Date: 02/21/2003
 Status: Active Application
First Claim
1. nonlinear distortion compensation circuit comprises:
 Power calculator is used to calculate the performance number of input signal;
The working point is provided with the unit, be used for based on offering a kind of relation that this working point is provided with the unit in advance, promptly be used to amplify the relation between the temperature of the I/O characteristic of power amplifier of described input signal and this power amplifier, calculate apparent performance number from providing from the performance number that temperature information and described power calculator calculated of external source, described temperature information is represented the measurement temperature of described power amplifier;
Contrary property calculation device, be used for the contrary composition that the apparent power value of calculating the unit is calculated the nonlinear distortion that is caused by described power amplifier being set from contrary performance data and described working point, described contrary performance data is offered described contrary property calculation device in advance, and relevant with the caused nonlinear distortion of described power amplifier;
WithComplex multiplier is used for the contrary composition that described contrary property calculation device the is calculated described input signal that is added to.
Chinese PRB Reexamination
Abstract
A nonlinear distortion compensating circuit for compensating for nonlinear distortion caused by a power amplifier for amplifying an input signal has a power calculator for calculating a power value for the input signal. An operating point setting unit calculates an apparent power value from temperature information, supplied from an external source, representative of the measured temperature of the power amplifier, and the power value calculated by the power calculator, based on a relationship, which has been given beforehand to the operating point setting unit, between input vs. output characteristics of the power amplifier and the temperature of the power amplifier. An inverse characteristics calculator calculates an inversion of the nonlinear distortion from inverse characteristics data, which have been given beforehand to the inverse characteristics calculator, about the nonlinear distortion caused by the power amplifier, and the apparent power value calculated by the operating point setting unit. A complex multiplier adds the inversion calculated by the inverse characteristics calculator to the input signal.

1 Citation
Method for measuring harmonic distortion of electric light intensity modulator  
Patent #
CN 102,353,525 A
Filed 07/08/2011

Current Assignee

No References
6 Claims

1. nonlinear distortion compensation circuit comprises:

Power calculator is used to calculate the performance number of input signal; The working point is provided with the unit, be used for based on offering a kind of relation that this working point is provided with the unit in advance, promptly be used to amplify the relation between the temperature of the I/O characteristic of power amplifier of described input signal and this power amplifier, calculate apparent performance number from providing from the performance number that temperature information and described power calculator calculated of external source, described temperature information is represented the measurement temperature of described power amplifier; Contrary property calculation device, be used for the contrary composition that the apparent power value of calculating the unit is calculated the nonlinear distortion that is caused by described power amplifier being set from contrary performance data and described working point, described contrary performance data is offered described contrary property calculation device in advance, and relevant with the caused nonlinear distortion of described power amplifier;
WithComplex multiplier is used for the contrary composition that described contrary property calculation device the is calculated described input signal that is added to.


2. nonlinear distortion compensation circuit as claimed in claim 1, wherein, described input signal comprises modulation signal, this modulation signal is to produce by first baseband signal that comprises a string real number value is carried out quadrature amplitude modulation with second baseband signal that comprises a string imaginary value, and wherein, described power calculator calculates described performance number from described first and second baseband signals, described contrary property calculation device offers described complex multiplier with the real part and the imaginary part of the contrary composition of described nonlinear distortion, and described complex multiplier is carried out complex multiplication to described first and second baseband signals and from real part and imaginary part that described contrary property calculation device provides.

3. radiating circuit comprises:

Nonlinear distortion compensation circuit as claimed in claim 1; Modulator is used to modulate the signal from described nonlinear distortion compensation circuit output; Power amplifier is used to amplify the modulation signal from described modulator output;
WithThermometer is used to measure the temperature of described power amplifier, and will represent that the temperature information of described measurement temperature offers described nonlinear distortion compensation circuit.


4. radiating circuit as claimed in claim 3, wherein, described modulator comprises the modulator that is used to carry out the quadrature amplitude modulation form.

5. method that is used for compensating nonlinear distortion may further comprise the steps:

(a) performance number of calculating input signal; (b) measure the temperature of the power amplifier be used to amplify described input signal; (c) based on a kind of relation that provides in advance, i.e. relation between the temperature of the I/O characteristic of described power amplifier and described power amplifier, measured temperature is calculated apparent performance number in performance number of being calculated from step (a) and the step (b); (d) calculate the contrary composition of the caused nonlinear distortion of described power amplifier from the contrary performance data that provides in advance and the apparent power value of being calculated step (c), described contrary performance data is relevant with the caused nonlinear distortion of described power amplifier;
And(e) the contrary composition that will be calculated in step (d) is added on the described input signal.


6. method as claimed in claim 5, wherein, described input signal comprises modulation signal, this modulation signal is to produce by first baseband signal that comprises a string real number value is carried out quadrature amplitude modulation with second baseband signal that comprises a string imaginary value, and wherein, described step (a) comprises the step of calculating described performance number from described first and second baseband signals, described step (d) comprises the real part of the contrary composition that calculates described nonlinear distortion and the step of imaginary part, and described step (e) comprises the step to described first and second baseband signals and real part that is calculated and imaginary part execution complex multiplication in described step (d).
Specification(s)