Freescale Semiconductor,inc.

Intel Corporation

Apple Inc.

Jorge Ivonnet

Mahibur Rahman

Robert Mark Gorday

Chuanzhao Yu

Kevin T McLaughlin

Omid Oliaei

David J Graham

Peter Noest

Mohammed Alam

John J Parkes, Jr

Yatish Mishra

Pravinkumar Premakanthan

Hasham Khushk

James Gregory Mittel

An apparatus of user equipment (UE) includes a radio integrated circuit (IC), an adjustable external low noise amplifier (eLNA) external to the radio IC, and processing circuitry. The radio IC includes a receive signal circuit path including an adjustable gain internal low noise amplifier (iLNA), and a transmit signal circuit path including a digital-to-analog converter (DAC) circuit configured to convert digital signals to analog baseband signals for transmitting. The processing circuitry is configured to provide digital values of the digital signals to the DAC circuit and initiate adjusting gain of one or both of the iLNA and the eLNA according to the digital values.

Detecting high TX leakage to improve linearity

Aspects include an apparatus and a method for performing Second Order Input Intercept Point (IIP2) calibration of a Digital-to-Analog (DAC) during a full-duplex mode receive operation. In some aspects, a plurality of correlation values are obtained, indicating an amount of IMD energy of an RF signal, wherein the correlation values are associated with IIP2DAC values of a DAC. In some aspects, the apparatus can calculate a mixer bias value, based on the correlation values, and adjust a bias value of a mixer according to the determined bias value. The apparatus can obtain the correlation values, calculate the bias value, and adjust the bias value of the mixer during the full-duplex mode receive operation. In some aspects, the apparatus can thus improve IIP2 of the mixer and reduce IMD energy in a receive signal, during the receive operation, without the need of standby or factory calibration.

Method and apparatus for IIP2 calibration

A receiver for reducing a distortion component related to a baseband transmit signal in a baseband receive signal is provided. The receiver includes a distortion meter including a correlation unit configured to correlate a signal that depends on the baseband receive signal and a signal that depends on the baseband transmit signal. The receiver further includes a combiner configured to provide the baseband receive signal using the received radio frequency signal and a plurality of settings based on a correlation result of the distortion meter.

Receiver and a method for reducing a distortion component related to a baseband transmit signal in a baseband receive signal

A method may include: determining a signal strength of a signal in a receive path of a wireless communication element, the receive path configured to receive a wireless communication signal and convert the wireless communication signal into a digital signal based at least on an oscillator signal; selecting a current mode from at least one of a first current mode and a second current mode for the wireless communication element based at least on the signal strength; communicating a control signal to the receive path indicative of the current mode; modifying one or more operational parameters of the receive path such that the receive path consumes a different amount of current in each of the current modes.

System and method for controlling current to certain components of a wireless communication device

A direct conversion receiver () includes a low noise amplifier (LNA) (), at least one baseband amplifier (and), register banks (and) for storing a plurality of offset data corresponding to at least two LNA gain settings and a plurality of baseband gain settings, a DC offset correction system () for providing a DC offset signal, a state machine () for sequencing through each of the plurality of baseband gain settings and through enable and disable states for the LNA, and a processor () programmed to activate the state machine and to run the DC offset correction system.

DC offset calibration in a direct conversion receiver

A correlator () for de-spreading a spread-spectrum signal includes a state machine (), a frequency correction look-up table (), a pseudorandom code generator (), and a correlator structure (and). The spread-spectrum signal includes symbols, and each symbol includes a plurality of chips. The correlator structure includes a plurality of taps (and) at which a coordinate rotation digital computer (CORDIC) operation is performed to determine an offset from a nominal carrier frequency of the spread-spectrum signal and to change a phase of each chip of a received symbol, in order to correct a carrier frequency of the spread-spectrum signal while de-spreading the spread-spectrum signal.

Joint de-spreading and frequency correction using a correlator

A multi-mode transmitter () is adapted to modulate a data packet () communicated by a wireless communications signal. The data packet includes a packet header comprising a preamble () and a start of frame delimiter (), and a data payload comprising a payload data length portion () and a payload portion (). The packet header is modulated with a spread spectrum technique. When transmitting a data payload in one mode, the data payload is also modulated with the spread spectrum technique. When transmitting a data payload in another mode, the data payload is modulated with a non-spread spectrum technique.

System and method for transmitting a multiple format wireless signal

An apparatus () and method () for receiving a communications signal. A spread spectrum signal demodulator () is adapted to demodulate a packet header () of a data packet () that is communicated by a wireless communications signal. The packet header () is modulated with a spread spectrum technique and the spread spectrum signal demodulator () produces a packet header detection signal () representing a successful detection of a predefined packet header value. A non-spread spectrum signal demodulator () is communicatively coupled to the spread spectrum signal demodulator () and demodulates, in response to the packet header detection signal (), a non-spread spectrum modulated data payload within the data packet. A data output select () produces demodulated data produced by either one or both the spread spectrum signal demodulator () and the non-spread spectrum signal demodulator ().

System and method for receiving a multiple format wireless signal

A method () and apparatus () facilitate closed loop transmit power control in a power control loop at and during a transition from one transmit power level to another transmit power level in a transmitter. The apparatus includes a reference path () configured to provide a reference signal () and a gain compensation signal (), a detect path () configured to process, in accordance with the gain compensation signal, a detected signal corresponding to a power level to provide a gain compensated detected signal; and a power control path () configured to generate a power control value in accordance with the reference signal, the gain compensated detected signal, and a loop compensation factor associated with the gain compensation signal where the power control value is suitable for setting the power level for the transmission.

Growing community of inventors

Chandler, AZ, United States of America

Jorge Ivonnet