Patents by Inventor Mark Rozental

Mark Rozental has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20070173213
    Abstract: In accordance with the present invention there is those provided a Cartesian loop transmitter having an isolator eliminator circuitry comprising a set of low pass and band pass filters for each of an I- and Q-channels, root mean square detectors and a divider connected to a comparator are received by a microprocessor which controls attenuation setting. There is also provided a method of adjusting an output level of such transmitter. Said method comprises the step of measuring an on-channel signal level and a noise level and then calculating a ratio of said noise to said on-channel signal. If the ratio exceeds a defined threshold an attenuation of the input attenuators is increased.
    Type: Application
    Filed: April 30, 2004
    Publication date: July 26, 2007
    Inventors: Moshe Ben-Ayun, Avi Ben-Salmon, Mark Rozental
  • Patent number: 7227916
    Abstract: An automatic gain control (AGC) method and circuit (10) within a receiver uses a digital state machine (26) to implement the AGC function. independent from interaction with a host processor (36) and for multiple modulation protocols without duplicating circuitry. Modulation protocol and parameters for any of various gain responses are stored in a register (29). Multiple states, each corresponding to a predetermined range of RF input signal strength, are stored in the register. Each state contains parameters that determine a gain control signal for controlling a variable gain amplifier (16). The states are independent and may be selectively disabled to create asymmetric responses. Within any state, an adaptable number of iterations may be set to implement a different update rate or step size after a predetermined number of closed loop gain change iterations has not resulted in a transition to a state that represents a desired output gain.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: June 5, 2007
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Charles R. Ruelke, Moshe Ben-Ayun, David J. Graham, Mark Rozental
  • Patent number: 7145410
    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).
    Type: Grant
    Filed: April 13, 2004
    Date of Patent: December 5, 2006
    Assignee: Motorola, Inc.
    Inventors: Nir Corse, Shay Nir, Mark Rozental
  • Publication number: 20060234654
    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).
    Type: Application
    Filed: March 11, 2004
    Publication date: October 19, 2006
    Inventors: Moshe Ben-Ayun, Gabriel Nocham, Mark Rozental
  • Publication number: 20060220739
    Abstract: A RFPA (radio frequency power amplifier) circuit (150) which includes a RFPA (101), a supply voltage source (104), means (155) for applying to the RFPA a gain control bias voltage and a feedback control loop (156) for adjusting a voltage applied to the RFPA, the feedback control loop including a sampler (107) for sampling an output of the RFPA, a RF detector (109) for detecting a level of RF power sampled by the sampler, a comparator (115) for comparing an output signal from the RF detector with a reference signal, an integrator (117) for integrating an output signal of the comparator and a voltage regulator (151) having a first input from the integrator and a second input from the supply voltage source and an output connected to the RFPA, the regulator being operable to apply to the RFPA a supply voltage adjusted in response to an input signal from the integrator.
    Type: Application
    Filed: April 1, 2005
    Publication date: October 5, 2006
    Inventors: Moshe Ben-Ayun, Ovadia Grossman, Shay Nir, Mark Rozental
  • Publication number: 20060202907
    Abstract: An antenna for use in a mobile radio communication device includes a conductive helical or spiral coil portion extending along an axis and, galvanically coupled to the coil portion, a conductive capacitive top load portion, wherein the coil portion and the top load portion are mutually arranged to provide an electrically resonant structure in a frequency band of operation of the device, wherein the coil portion has a first part and a second part and at least part of the top load portion extends outside or alongside the second part but not the first part of the coil portion, wherein the resonant structure has a plurality of electrical resonances at frequencies in a frequency band of operation of the device, and the first and second parts of the coil portion contribute to one of the resonances and the first part of the coil portion and the second portion contribute to another of the resonances.
    Type: Application
    Filed: May 31, 2006
    Publication date: September 14, 2006
    Applicant: MOTOROLA, INC.
    Inventors: Ovadia Grossman, Moshe Bem-Ayun, Mark Rozental
  • Patent number: 7095988
    Abstract: A device for linear transmitter (150) with improved loop gain stabilization. The linear transmitter (150) includes a main amplifier loop (178) and an auxiliary loop (176). The device includes an adjustable device (159), connected within the main amplifier feedback loop (178) and further connected to the auxiliary loop (176). The adjustable driver (159) receives an input signal from main amplifier feedback loop (178), amplifies it in accordance with a gain control signal received from the auxiliary loop (176) and provides the amplified signal to main amplifier feedback loop (178).
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: August 22, 2006
    Assignee: Motorola, Inc.
    Inventors: Moshe Ben-Ayun, Mark Rozental
  • Patent number: 7065335
    Abstract: An automatic gain control (AGC) circuit including: a forward transmission path (214) having applied at its input an input RF signal and to provide at its output an output signal; a variable gain AGC amplifier (210) in the forward transmission path for processing the input RF signal, which amplifier has a control input 240 and is responsive to a control signal applied at its control input to vary its gain; a feedback loop (220 to 240), coupled from the output of the forward transmission path and to the control input of the AGC amplifier; an integrator (230, 232), coupled to the control input of the amplifier; a voltage source (234), coupled to the integrator and to the control input of the amplifier; and a further variable gain device (215) for varying the gain or attenuation of a signal applied to the control input of the AGC amplifier.
    Type: Grant
    Filed: June 3, 2002
    Date of Patent: June 20, 2006
    Assignee: Motorola, Inc.
    Inventors: Moshe Ben-Ayun, Mark Rozental, Roman Pasternak, Izak Avayu
  • Publication number: 20050123064
    Abstract: A wireless communication unit (300) comprises a linearized transmitter (325, 500) having a power amplifier (324), a forward path and a feedback path for feeding back a portion of a signal to be transmitted, wherein the feedback path and forward path form two loops in quadrature. A processor (322) applies one or more training signals to a first quadrature circuit loop and a second quadrature circuit loop and measures a quadrature imbalance between the first and second quadrature circuit loops. In response the processor adjusts at least one parameter setting of a loop adjustment function (442) to balance the quadrature circuit loops. A linearized transmitter integrated circuit and method of training are also described. The measuring and compensating for any loop imbalance between digital ā€˜Iā€™ and ā€˜Qā€™ paths around a feedback path provides improved accuracy and stability in phase and/or amplitude.
    Type: Application
    Filed: November 18, 2004
    Publication date: June 9, 2005
    Inventors: Moshe Ben-Ayun, Ovadia Grossman, Mark Rozental
  • Publication number: 20050047533
    Abstract: An automatic gain control (AGC) method and circuit (10) within a receiver uses a digital state machine (26) to implement the AGC function. independent from interaction with a host processor (36) and for multiple modulation protocols without duplicating circuitry. Modulation protocol and parameters for any of various gain responses are stored in a register (29). Multiple states, each corresponding to a predetermined range of RF input signal strength, are stored in the register. Each state contains parameters that determine a gain control signal for controlling a variable gain amplifier (16). The states are independent and may be selectively disabled to create asymmetric responses. Within any state, an adaptable number of iterations may be set to implement a different update rate or step size after a predetermined number of closed loop gain change iterations has not resulted in a transition to a state that represents a desired output gain.
    Type: Application
    Filed: August 26, 2003
    Publication date: March 3, 2005
    Inventors: Charles Ruelke, Moshe Ben-Ayun, David Graham, Mark Rozental
  • Publication number: 20050003783
    Abstract: An automatic gain control (AGC) circuit including: a forward transmission path (214) having applied at its input an input RF signal and to provide at its output an output signal; a variable gain AGC amplifier (210) in the forward transmission path for processing the input RF signal, which amplifier has a control input 240 and is responsive to a control signal applied at its control input to vary its gain; a feedback loop (220 to 240), coupled from the output of the forward transmission path and to the control input of the AGC amplifier; an integrator (230, 232), coupled to the control input of the amplifier; a voltage source (234), coupled to the integrator and to the control input of the amplifiers; and a further variable gain device (215) for varying the gain or attenuation of a signal applied to the control input of the AGC amplifier.
    Type: Application
    Filed: June 3, 2002
    Publication date: January 6, 2005
    Inventors: Moshe Ben-Ayun, Mark Rozental, Roman Pasternak, Izak Avayu
  • Publication number: 20040222858
    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).
    Type: Application
    Filed: April 13, 2004
    Publication date: November 11, 2004
    Inventors: Nir Corse, Shay Nir, Mark Rozental
  • Patent number: 6717484
    Abstract: A voltage controlled oscillator (VCO) for connection and operation in a phase locked loop arrangement has two or more operational states in each of which the VCO circuit is operable to provide activation of a selected one of two or more different phase locked loops when connected to the VCO circuit, the VCO circuit including switching means for switching the state of the VCO circuit to allow the operational state of the VCO to be selected. A frequency synthesizer circuit for use in radio communications to generate a stable frequency signal, the circuit includes the VCO circuit. The synthesizer circuit includes two or more different phase locked loops each having a first state in which the loop is activated and a second state in which the loop is deactivated. At least part of the VCO circuit is connected in and shared by the loops, so that the loop to be activated can be selected by selecting the operational state of the VCO.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: April 6, 2004
    Assignee: Motorola, Inc.
    Inventors: Moshe Ben-Ayun, Mark Rozental, Gabi Nocham
  • Publication number: 20040009758
    Abstract: Apparatus and a method for fast attack automatic gain control (AGC) loop for narrow band systems in which RF signals are received in discontinuous bursts, such as TETRA systems in a direct mode of operation (DMO). The loop includes a feedback loop with a predetermined non-linear response to an input signal. The method includes the steps of opening the AGC loop (250), setting a gain for the signal path of the AGC loop to a predetermined level (252), closing the AGC loop (254) and commencing a steady-state mode of operation (258).
    Type: Application
    Filed: June 12, 2003
    Publication date: January 15, 2004
    Inventors: David James Graham, Victor Korol, Mark Rozental
  • Publication number: 20030119462
    Abstract: A device for linear transmitter 150 with improved loop gain stabilization. The linear transmitter 150 includes a main amplifier loop 178 and an auxiliary loop 176. The device includes an adjustable driver 159, connected within the main amplifier feedback loop 178 and further connected to the auxiliary loop 176. The adjustable driver 159 receives an input signal from main amplifier feedback loop 178, amplifies it in accordance with a gain control signal received from the auxiliary loop 176 and provides the amplified signal to main amplifier feedback loop 178.
    Type: Application
    Filed: December 10, 2002
    Publication date: June 26, 2003
    Inventors: Moshe Ben-Ayun, Mark Rozental
  • Publication number: 20030006854
    Abstract: A voltage controlled oscillator (VCO) for connection and operation in a phase locked loop arrangement has two or more operational states in each of which the VCO circuit is operable to provide activation of a selected one of two or more different phase locked loops when connected to the VCO circuit, the VCO circuit including switching means for switching the state of the VCO circuit to allow the operational state of the VCO to be selected.
    Type: Application
    Filed: May 23, 2002
    Publication date: January 9, 2003
    Inventors: Moshe Ben-Ayun, Mark Rozental, Gabi Nocham
  • Patent number: 5748037
    Abstract: A method of calibration of a power amplifier for a radio transmitter is described (FIG. 6), which is particularly relevant to the field of training of linear power amplifiers. In a calibration mode, an increasing signal, e.g. a ramp signal (153), is provided to the amplifier until the amplifier commences clipping (155). A value for said input is identified (155) which does not cause clipping. Thereafter, in operational mode, the increasing input signal is limited to that level. In this manner, interference during training is avoided. A radio transmitter is also provided.
    Type: Grant
    Filed: December 2, 1996
    Date of Patent: May 5, 1998
    Assignee: Motorola, Inc.
    Inventors: Mark Rozental, Ilan Yehezkel Horowitz, Moshe Ben-Ayun
  • Patent number: 5722056
    Abstract: This invention relates to a radio transmitter having a power amplifier and a linearizer arrangement, for example Cartesian feedback, for compensating for non-linearity in the power amplifier. A training signal is applied to the amplifier (36) and the linearizer arrangement is adjusted during a training mode of operation. In one embodiment, a look-up table (23) is provided for storing predetermined operating condition adjustment parameters. According to an operating condition input (e.g. frequency, temperature) control means (21) select operating condition adjustment parameters during the training mode and adjust the training signal to compensate for loop gain variations during the training mode. Automatic gain control (26) may be provided in the amplifier loop for activation during at least a portion of the training mode of operation to maintain constant closed loop gain.
    Type: Grant
    Filed: July 19, 1995
    Date of Patent: February 24, 1998
    Assignee: Motorola, Inc.
    Inventors: Ilan Horowitz, Moshe Ben Ayun, Roni Shamsian, Nachman Grabsky, Mark Rozental