N-th order curve fit for power calibration in a mobile terminal
First Claim
1. A method of calibrating an output power of a mobile terminal comprising:
- a) providing a radio frequency (RF) input signal to an input of a power amplifier of the mobile terminal;
b) for each of an upper-band frequency, a mid-band frequency, and a lower-band frequency of a desired frequency band, measuring an output power of the mobile terminal for each of a plurality of values of an adjustable power amplifier gain (PAG), wherein the plurality of values of the PAG for each of the upper-band frequency, the mid-band frequency, and the lower-band frequency comprises at least three values;
c) for each of the upper-band frequency, the mid-band frequency, and the lower-band frequency of the desired frequency band, performing a curve fit for the plurality of values of the PAG and the corresponding plurality of measurements of the output power, thereby providing a plurality of coefficients defining a polynomial describing a PAG versus output power characteristic of the power amplifier; and
d) determining values of the PAG corresponding to a plurality of desired output power levels and a plurality of frequencies within the desired frequency band based on the polynomials describing the PAG versus output power characteristic of the power amplifier for each of the upper-band, mid-band, and lower-band frequencies of the desired frequency band.
4 Assignments
0 Petitions
Accused Products
Abstract
A method for calibrating the output power of a mobile terminal using at least a second order curve fit to describe a power amplifier gain (PAG) setting versus output power characteristic of a power amplifier in a transmitter of the mobile terminal is provided. For each of an upper-band frequency, a mid-band frequency, and a lower-band frequency of a frequency band, multiple measurements of the output power of the mobile terminal are made corresponding to multiple values of the PAG setting, and a curve fit is performed, thereby calculating coefficients defining a polynomial describing the PAG setting versus output power characteristic. Using the polynomials describing the PAG setting versus output power characteristic of the power amplifier for each of the upper-band, mid-band, and lower-band frequencies, values of the PAG setting are determined for each desired output power level for each desired frequency within the frequency band.
233 Citations
21 Claims
-
1. A method of calibrating an output power of a mobile terminal comprising:
-
a) providing a radio frequency (RF) input signal to an input of a power amplifier of the mobile terminal; b) for each of an upper-band frequency, a mid-band frequency, and a lower-band frequency of a desired frequency band, measuring an output power of the mobile terminal for each of a plurality of values of an adjustable power amplifier gain (PAG), wherein the plurality of values of the PAG for each of the upper-band frequency, the mid-band frequency, and the lower-band frequency comprises at least three values; c) for each of the upper-band frequency, the mid-band frequency, and the lower-band frequency of the desired frequency band, performing a curve fit for the plurality of values of the PAG and the corresponding plurality of measurements of the output power, thereby providing a plurality of coefficients defining a polynomial describing a PAG versus output power characteristic of the power amplifier; and d) determining values of the PAG corresponding to a plurality of desired output power levels and a plurality of frequencies within the desired frequency band based on the polynomials describing the PAG versus output power characteristic of the power amplifier for each of the upper-band, mid-band, and lower-band frequencies of the desired frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of calibrating an output power of a mobile terminal comprising:
-
a) providing an RF input signal to an input of a power amplifier of the mobile terminal; b) for a mid-band frequency of a desired frequency band, measuring an output power of the mobile terminal for each of a plurality of values of an adjustable power amplifier gain (PAG), wherein the plurality of values of the PAG comprises at least three values; and c) performing a curve fit for the plurality of values of the PAG and the corresponding plurality of measurements of the output power, thereby calculating a plurality of coefficients defining a polynomial describing a PAG versus output power characteristic of the power amplifier. - View Dependent Claims (13, 14, 15)
-
-
16. A system for calibrating an output power of a mobile terminal comprising:
-
a) output power detection circuitry adapted to measure the output power of the mobile terminal; and b) a calibration control system that calibrates the output power of the mobile terminal for a desired frequency band, the calibration control system adapted to; i) control the mobile terminal such that an RF input signal is provided to an input of a power amplifier of the mobile terminal; ii) for each of an upper-band frequency, a mid-band frequency, and a lower-band frequency of the desired frequency band, receive measurements of the output power of the mobile terminal from the output power detection circuitry for each of a plurality of values of an adjustable power amplifier gain (PAG), wherein the plurality of values of the PAG for each of the upper-band frequency, the mid-band frequency, and the lower-band frequency comprises at least three values; iii) for each of the upper-band frequency, the mid-band frequency, and the lower-band frequency of the desired frequency band, perform a curve fit for the plurality of values of the PAG and the corresponding plurality of measurements of the output power, thereby providing a plurality of coefficients defining a polynomial describing a PAG versus output power characteristic of the power amplifier; and iv) determine values of the PAG corresponding to a plurality of desired output power levels and a plurality of frequencies within the desired frequency band based on the polynomials describing the PAG versus output power characteristic of the power amplifier for each of the upper-band, mid-band, and lower-band frequencies of the desired frequency band. - View Dependent Claims (17, 18, 19, 20, 21)
-
Specification