Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a transmitter includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.

Abstract: A method for estimating a sampling delay error between a first analog-to-digital converter (ADC) and a second ADC in a time-interleaved ADC includes: receiving a first digital output signal and a second digital output signal generated from the first ADC and the second ADC based on a same analog input signal, respectively; determining a delay amount according to a predetermined sampling delay between the first ADC and the second ADC and a delay adjusting value, and applying the delay amount delay to the second digital output signal to generate a delayed digital output signal, wherein the delay adjusting value Td is used to estimate the sampling delay error Te; calculating a difference between the first digital output signal and the delayed digital output signal; and feeding back the difference for adjusting the delay adjusting value Td according to the difference.

Abstract: A method for compensating mismatches of an in-phase signal and a quadrature signal of a transmitter/receiver is provided. The method includes: receiving a plurality of test signals to generate two groups of factors, respectively, where each group of factors is applied to two multipliers utilized for compensating a gain mismatch and a phase mismatch of the in-phase signal and the quadrature signal of the transmitter/receiver; then calculating a delay mismatch of the in-phase signal and the quadrature signal according to the two groups of factors.

Abstract: A method for compensating mismatches of an in-phase signal and a quadrature signal of a transmitter/receiver is provided. The method includes: receiving a plurality of test signals to generate two groups of factors, respectively, where each group of factors is applied to two multipliers utilized for compensating a gain mismatch and a phase mismatch of the in-phase signal and the quadrature signal of the transmitter/receiver; then calculating a delay mismatch of the in-phase signal and the quadrature signal according to the two groups of factors.

Abstract: A method for estimating a sampling delay error between a first analog-to-digital converter (ADC) and a second ADC in a time-interleaved ADC includes: receiving a first digital output signal and a second digital output signal generated from the first ADC and the second ADC based on a same analog input signal, respectively; determining a delay amount according to a predetermined sampling delay between the first ADC and the second ADC and a delay adjusting value, and applying the delay amount delay to the second digital output signal to generate a delayed digital output signal, wherein the delay adjusting value Td is used to estimate the sampling delay error Te; calculating a difference between the first digital output signal and the delayed digital output signal; and feeding back the difference for adjusting the delay adjusting value Td according to the difference.

Abstract: A method for compensating mismatches of an in-phase signal and a quadrature signal of a transmitter/receiver is provided. The method includes: receiving a plurality of test signals to generate two groups of factors, respectively, where each group of factors is applied to two multipliers utilized for compensating a gain mismatch and a phase mismatch of the in-phase signal and the quadrature signal of the transmitter/receiver; then calculating a delay mismatch of the in-phase signal and the quadrature signal according to the two groups of factors.

Abstract: A method and apparatus of calibrating I/Q mismatch of a communication circuit is disclosed. The disclosure employs I/Q test signals respectively including different frequency components to calibrate the frequency-dependent I/Q mismatch existing in the communication system.

Abstract: A receiver having a mixer for mixing a radio frequency signal and a local oscillator signal so as to generate a base band signal, a detecting unit for generating from the base band signal a detection signal that represents an extent of local oscillation leakage, and an adjusting unit coupled electrically to said mixer for outputting a control signal thereto to control a current operating state of said mixer, said adjusting unit being further coupled electrically to said detecting unit, and determining whether there is a reduction in the extent of local oscillation leakage based on the detection signal from said detecting unit. In operation, the adjusting unit maintains an adjusting direction for the control signal upon determining that the extent of local oscillation leakage is reduced, reverses the adjusting direction upon determining that the extent of local oscillation leakage is not reduced, and adjusts the control signal according to the adjusting direction.

Abstract: A receiver for compensating I/Q mismatch includes an analog down-conversion unit for receiving a radio frequency signal and down-converting the RF signal into a set of digital low intermediate frequency (IF) signals, a digital down-conversion unit receiving the set of digital low IF signals and down-converting the set of digital low IF signals into first and second baseband signals, and a compensation unit. The compensation unit receives the first and second baseband signals, calculates a compensation parameter based thereon, and compensates I/Q mismatch effect according to the first and second baseband signals and the compensation parameter so as to output a target signal.

Abstract: A receiver having a mixer for mixing a radio frequency signal and a local oscillator signal so as to generate a base band signal, a detecting unit for generating from the base band signal a detection signal that represents an extent of local oscillation leakage, and an adjusting unit coupled electrically to said mixer for outputting a control signal thereto to control a current operating state of said mixer, said adjusting unit being further coupled electrically to said detecting unit, and determining whether there is a reduction in the extent of local oscillation leakage based on the detection signal from said detecting unit. In operation, the adjusting unit maintains an adjusting direction for the control signal upon determining that the extent of local oscillation leakage is reduced, reverses the adjusting direction upon determining that the extent of local oscillation leakage is not reduced, and adjusts the control signal according to the adjusting direction.

Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a receiver includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.

Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a receiver includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.

Abstract: A method and apparatus of calibrating I/Q mismatch of a communication circuit is disclosed. The disclosure employs I/Q test signals respectively including different frequency components to calibrate the frequency-dependent I/Q mismatch existing in the communication system.

Abstract: A receiver for compensating I/Q mismatch includes an analog down-conversion unit for receiving a radio frequency signal and down-converting the RF signal into a set of digital low intermediate frequency (IF) signals, a digital down-conversion unit receiving the set of digital low IF signals and down-converting the set of digital low IF signals into first and second baseband signals, and a compensation unit. The compensation unit receives the first and second baseband signals, calculates a compensation parameter based thereon, and compensates I/Q mismatch effect according to the first and second baseband signals and the compensation parameter so as to output a target signal.

Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a receiver includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.

Abstract: An adjusting method for reducing in-phase/quadrature-phase (I/Q) mismatch in a transmitter includes the steps of: a) receiving a first in-phase signal and a first quadrature-phase signal; b) adjusting a set of parameters such that an extent of I/Q mismatch related to the first in-phase signal and the first quadrature-phase signal is reduced; c) receiving a second in-phase signal and a second quadrature-phase signal, the second in-phase signal differing from the first in-phase signal in one of frequency and phase; d) adjusting the set of parameters such that an extent of I/Q mismatch related to the second in-phase signal and the second quadrature-phase signal is reduced; and e) determining final values for the set of parameters based on adjustment results of steps b) and d) such that extents of I/Q mismatch related to different frequencies are reduced.

Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a transmitter includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.

Abstract: An adjusting method for reducing local oscillation leakage or I/Q mismatch in a receiver includes the steps of: (a) detecting a current extent of local oscillation leakage or I/Q mismatch; (b) determining if an adjusting direction is correct with reference to the current extent of local oscillation leakage or I/Q mismatch thus detected, maintaining the adjusting direction if correct, and reversing the adjusting direction upon determining that the adjusting direction is incorrect; and (c) adjusting a control signal according to the adjusting direction.