公开(公告)号：CA2572236C

公开(公告)日：2010-10-19

申请号：CA2572236

申请日：2005-06-23

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  CORSE NIR ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H03K9/00 ,  H03D3/00 ,  H04B1/707 ,  H04L27/08 ,  H04L27/14

Abstract: A wireless receiver comprising an input signal path (101), a circuit (113) for producing in-phase and quadrature components, and an estimator (204) for periodically estimating an imbalance in amplitude between the in-phase and quadrature components and for applying a relative adjustment in amplitude to compensate for the detected imbalance, wherein the estimator (204) is operable (i) to divide samples I i of the in-phase component I(t) and corresponding samples Q i of the quadrature component Q(t) into blocks; (ii) to calculate for each block, a block power value I n corresponding to a summation of values of squares of the samples I n; (iii) to calculate from the block power values I n and Q n a block amplitude imbalance value (see above formula); and (iv) to calculate for a set of the block amplitude imbalance values an average value.

公开(公告)号：GB2394372A

公开(公告)日：2004-04-21

申请号：GB0224352

申请日：2002-10-19

Applicant: MOTOROLA INC

Inventor： CORSE NIR ,  SHIMON GUY ,  SHAMSIAN RONI

IPC: H03B21/02 ,  H04B1/04 ,  H04L27/00 ,  H04L27/20 ,  H04L27/12 ,  H03C3/09

Abstract: A wireless communication unit (400) comprises a dual-port modulator for generating a radio frequency signal. A digital to analogue converter (446), operably coupled to a data generator (570), converts digital data to an analogue signal to be used in generating the radio frequency signal. An attenuator (450), operably coupled to the digital to analogue converter (446) attenuates the analogue signal output from the digital to analogue converter (446). A signal processor (402) is operably coupled to the attenuator (450) for setting an attenuation value of the attenuator (450) to balance signals input to the two ports of the dual-port modulator. This enables the wireless communication unit to balance levels of the dual-port and direct-port signals thereby minimising phase error RMS and phase error peaks in the generated frequency signal. Cheaper reference oscillators with less accuracy components may then be used, as the arrangement and method automatically compensate for any mismatch between the ports.

公开(公告)号：GB2437574A

公开(公告)日：2007-10-31

申请号：GB0608363

申请日：2006-04-28

Applicant: MOTOROLA INC

Inventor： CORSE NIR ,  BEN-AYUN MOSHE ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H03D3/00

Abstract: A wireless receiver (100) demodulates a frequency modulated RF signal by a direct conversion procedure, including channels (110, 112) for producing in-phase and quadrature components. A processor (123, 133) periodically estimates an error in at least one of the in-phase and quadrature phase components and produces an adjustment signal of at least one of the in-phase and quadrature components to compensate for the detected error. The processor is operable to apply alternatively different procedures to estimate the error. The procedures including a first procedure applied when a signal quality value of the received RF signal is above a threshold value and a second procedure applied when a signal quality value of the RF received signal is not above the threshold value. Also described is a method (300) of operation of the receiver. The error may be a DC offset, phase and/or amplitude error.

公开(公告)号：CA2572236A1

公开(公告)日：2006-02-02

申请号：CA2572236

申请日：2005-06-23

Applicant: MOTOROLA INC

Inventor： CORSE NIR ,  GROSSMAN OVADIA ,  ROZENTAL MARK ,  BEN-AYUN MOSHE

IPC: H03K9/00 ,  H03D3/00 ,  H04B1/707 ,  H04L27/08 ,  H04L27/14

公开(公告)号：GB2401263B

公开(公告)日：2006-01-11

申请号：GB0309750

申请日：2003-04-29

Applicant: MOTOROLA INC

Inventor： CORSE NIR ,  NIR SHAY ,  ROZENTAL MARK

IPC: H03B5/12

Abstract: A wireless communication unit (100) comprises a voltage controlled oscillator (123) having an active device (450) operably coupled to a first variable capacitance (425) to provide a variable capacitance value based on an applied steering line voltage, and a feedback network comprising a resonator (475), operably coupled to an output of the active device, for feeding power back to an input of the active device to sustain oscillations (123). Notably, a second variable capacitance is operably coupled to receive a control voltage from the steering line (405) and located between the resonator (475) and the active device (450). The provision of a second variable capacitance located as described enables a VCO circuit to operate over a wider bandwidth with the same tuning voltages, say around 15% of the VCO's centre frequency. This is achieved due to gain margin tuning applied to the resonator and second variable capacitor of the VCO circuit.

公开(公告)号：GB2437574B

公开(公告)日：2008-06-25

申请号：GB0608363

申请日：2006-04-28

Applicant: MOTOROLA INC

Inventor： CORSE NIR ,  BEN-AYUN MOSHE ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H03D3/00

Abstract: A wireless receiver (100) for receiving and demodulating a frequency modulated RF (radio frequency) signal by a direct conversion procedure, including channels (110, 112) for producing in-phase and quadrature components of a received RF signal, and a processor (123, 133) for periodically estimating an error in at least one of the in-phase and quadrature phase components and for producing a signal for adjustment of at least one of the in-phase and quadrature components to compensate for the detected error, wherein the processor is operable to apply alternatively each of a plurality of different procedures to estimate the error, the procedures including a first procedure which is applied when a signal quality value of the received RF signal is above a threshold value and a second procedure which is applied when a signal quality value of the RF received signal is not above the threshold value.

公开(公告)号：DE112005001456T5

公开(公告)日：2007-05-31

申请号：DE112005001456

申请日：2005-06-23

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  CORSE NIR ,  GROSSMANN OVADIA ,  ROZENTAL MARK

IPC: H03K9/00 ,  H03D3/00 ,  H04B1/707 ,  H04L27/08 ,  H04L27/14

公开(公告)号：GB2424326A

公开(公告)日：2006-09-20

申请号：GB0505493

申请日：2005-03-18

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  ROZENTAL MARK ,  CORSE NIR ,  GROSSMAN OVADIA

IPC: H03D1/22 ,  H03D3/00

Abstract: A receiver 200 for receiving and demodulating a frequency modulated RF signal by a direct conversion procedure includes an input signal path (101) receiving an RF input signal (x(t)), an I-channel (103) including a first mixer 107 for mixing the RF input signal with an in-phase reference signal to produce an in-phase component (I(t)), a Q-channel 105 including a second mixer 109 for mixing the input signal with a quadrature-phase reference signal to produce a quadrature-phase component (Q(t)). The receiver further includes a compensator for repeatedly measuring and compensating for DC offset produced by the receiver and combined with the input signal component in a respective I and/or Q channel. The compensator estimates 202, 204 a component of the DC offset present in the respective channel (I, Q) by (i) taking a set of N samples of the value of the input signal component in the respective channel; (ii) summing the values obtained for the N samples; and (iii) calculating an average value by dividing the sum by the number N of samples, and a combiner 206, 207 operable to combine with the input signal component an adjustment signal which cancels the estimated DC noise component in the respective channel. The receiver may also include a controller 203 operably coupled to the estimator 202, 205 to provide control signals to indicate when the estimator of the compensator should release the noise value it has estimated. The controller may also indicate an integration time to be used by the estimator of each compensator. The controller may include a detector which assists in control of the estimators by determining a frequency offset between the carrier frequency of the input signal and the reference signal produced by a local oscillator 221. The controller may, via a frequency setter 222, adaptively adjust the reference frequency produced by the local oscillator.

公开(公告)号：GB2401263A

公开(公告)日：2004-11-03

申请号：GB0309750

申请日：2003-04-29

Applicant: MOTOROLA INC

Inventor： CORSE NIR ,  NIR SHAY ,  ROZENTAL MARK

IPC: H03B5/12

Abstract: A wireless communication unit (100) comprises a voltage controlled oscillator (123) having an active device (450) operably coupled to a first variable capacitance (425) to provide a variable capacitance value based on an applied steering line voltage, and a feedback network comprising a resonator (475), operably coupled to an output of the active device, for feeding power back to an input of the active device to sustain oscillations (123). Notably, a second variable capacitance is operably coupled to the steering line (405) and located adjacent to the resonator (475). The provision of a second variable capacitance located adjacent to the resonator enables a VCO design to operate over a wider bandwidth with the same tuning voltages, say around 15% of the VCO's centre frequency. This is achieved due to gain margin tuning applied to the resonator and second variable capacitor of the VCO circuit.

公开(公告)号：GB2424326B

公开(公告)日：2008-01-16

申请号：GB0505493

申请日：2005-03-18

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  ROZENTAL MARK ,  CORSE NIR ,  GROSSMAN OVADIA

IPC: H03D3/00 ,  H03D1/22