公开(公告)号：AT432578T

公开(公告)日：2009-06-15

申请号：AT04719464

申请日：2004-03-11

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  NOCHAM GABRIELA ,  ROZENTAL MARK

IPC: H04L27/36 ,  H03F1/32 ,  H03F1/34 ,  H04L27/00

Abstract: A wireless communication unit ( 300 ) comprises a linearised transmitter ( 325 ) having a forward path, a power amplifier ( 324 ) and a feedback loop, operably coupled to the power amplifier ( 324 ) and the forward path. The feedback loop comprises a loop adjustment function ( 442 ), and the forward path and feedback loop comprise quadrature circuits. A processor ( 322 ) applies a first training signal to a first quadrature circuit loop for routing through the forward path, power amplifier and feedback path to determine at least one first parameter setting of the loop adjustment function ( 442 ). The processor ( 322 ) also applies a second training signal to a second quadrature circuit loop to determine at least a second parameter setting of the loop adjustment function ( 442 ).

公开(公告)号：GB2400250A

公开(公告)日：2004-10-06

申请号：GB0307372

申请日：2003-03-31

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  NOCHAM GABRIELA ,  ROZENTAL MARK

IPC: H03F1/32 ,  H03F1/34 ,  H04L27/00 ,  H04L27/36 ,  H04B1/04

Abstract: Separate test signals are applied to the I and Q channels of a Cartesian amplifier to provide separate estimates of the phase shift setting for the LO phase shifter 442 in the feedback circuit. The average of the two phase shift settings is applied to the phase shifter, giving improved loop IQ phase balance in comparison with calibration using only one test signal. Reduced tolerance 90 degree LO phase shifters 436,422 can be used. Loop stability and wideband noise performance are improved. Test signals may be applied to determine amplitude imbalance. The technique may also be applied to linearized amplifier systems using predistortion.

公开(公告)号：DE602004021245D1

公开(公告)日：2009-07-09

申请号：DE602004021245

申请日：2004-03-11

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  NOCHAM GABRIELA ,  ROZENTAL MARK

IPC: H04L27/36 ,  H03F1/32 ,  H03F1/34 ,  H04L27/00

Abstract: A wireless communication unit ( 300 ) comprises a linearised transmitter ( 325 ) having a forward path, a power amplifier ( 324 ) and a feedback loop, operably coupled to the power amplifier ( 324 ) and the forward path. The feedback loop comprises a loop adjustment function ( 442 ), and the forward path and feedback loop comprise quadrature circuits. A processor ( 322 ) applies a first training signal to a first quadrature circuit loop for routing through the forward path, power amplifier and feedback path to determine at least one first parameter setting of the loop adjustment function ( 442 ). The processor ( 322 ) also applies a second training signal to a second quadrature circuit loop to determine at least a second parameter setting of the loop adjustment function ( 442 ).

公开(公告)号：GB2400250B

公开(公告)日：2005-05-25

申请号：GB0307372

申请日：2003-03-31

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  NOCHAM GABRIELA ,  ROZENTAL MARK

IPC: H03F1/32 ,  H03F1/34 ,  H04L27/00 ,  H04L27/36 ,  H04B1/04

Abstract: A wireless communication unit ( 300 ) comprises a linearised transmitter ( 325 ) having a forward path, a power amplifier ( 324 ) and a feedback loop, operably coupled to the power amplifier ( 324 ) and the forward path. The feedback loop comprises a loop adjustment function ( 442 ), and the forward path and feedback loop comprise quadrature circuits. A processor ( 322 ) applies a first training signal to a first quadrature circuit loop for routing through the forward path, power amplifier and feedback path to determine at least one first parameter setting of the loop adjustment function ( 442 ). The processor ( 322 ) also applies a second training signal to a second quadrature circuit loop to determine at least a second parameter setting of the loop adjustment function ( 442 ).