Patents by Inventor Kemal Ozanoglu
Kemal Ozanoglu 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).
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Patent number: 9407144Abstract: A current mode control buck-boost converter with improved performance utilizes separate buck and boost pulses. The buck-boost converter utilizes a buck/boost decision method with continuous control voltage for buck and boost mode, therefore eliminating transients in the control loop between operation modes and preventing voltage overshoots. If switching in Boost mode and the buck duty cycle is smaller than a set duty cycle, then in the next cycle Buck mode switching will occur. It is possible to track a Buck comparator output and the related duty cycle during Boost mode operation. Thus a mode change decision will only be dependent on a single input. A control loop will incorporate a single loop filter and error amplifier, wherein control voltages for Buck comparator and Boost comparator will be related.Type: GrantFiled: June 19, 2014Date of Patent: August 2, 2016Assignee: Dialog Semiconductor (UK) LimitedInventors: Kemal Ozanoglu, Selcuk Talay, Pier Cavallini, Dieter Graefje, Andrea Acquas
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Publication number: 20160204687Abstract: A node that stores a charge is discharged in two phases, starting with a current controlled phase where a current mirror sink controls the current sunk from the node, and then moving to a second phase where a resistive discharge is provided. A pull down device such as a transistor switches from its saturation mode in the first phase to its linear mode in the second phase. a discharge circuit implementing this method provides optimized area and control for the discharge process as compared with approaches that rely solely on current mirroring or resistive discharging.Type: ApplicationFiled: January 14, 2015Publication date: July 14, 2016Inventors: Emre Topcu, Turev Acar, Kemal Ozanoglu
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Patent number: 9323266Abstract: A method and a system for increasing the open loop gain of linear regulators are presented. A linear regulator to derive an output voltage from an input voltage is described. The linear regulator contains an amplifier to derive an amplifier output signal from an amplifier input signal, and a pass device to convert the amplifier output signal into the output voltage. The linear regulator has a positive feedback loop using a positive feedback gain ?, and a negative feedback loop using a negative feedback gain ?. In addition, the linear regulator has a combining unit to determine the amplifier input signal from the input voltage, from the positive feedback signal and from the negative feedback voltage. A transfer function of the linear regulator exhibits a first and a second pole at a first frequency wp1 and at a second frequency wp2, respectively.Type: GrantFiled: September 24, 2014Date of Patent: April 26, 2016Assignee: Dialog Semiconductor GmbHInventors: Kemal Ozanoglu, Merve Toka, Selcuk Talay, Frank Kronmueller
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Publication number: 20150357914Abstract: A current mode control buck-boost converter with improved performance utilizes separate buck and boost pulses. The buck-boost converter utilizes a buck/boost decision method with continuous control voltage for buck and boost mode, therefore eliminating transients in the control loop between operation modes and preventing voltage overshoots. If switching in Boost mode and the buck duty cycle is smaller than a set duty cycle, then in the next cycle Buck mode switching will occur. It is possible to track a Buck comparator output and the related duty cycle during Boost mode operation. Thus a mode change decision will only be dependent on a single input. A control loop will incorporate a single loop filter and error amplifier, wherein control voltages for Buck comparator and Boost comparator will be related.Type: ApplicationFiled: June 19, 2014Publication date: December 10, 2015Inventors: Kemal Ozanoglu, Selcuk Talay, Pier Cavallini, Dieter Graefje, Andrea Acquas
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Patent number: 9112406Abstract: The present document relates to charge pump voltage doublers for use in integrated circuits. A charge pump circuit configured to generate an output voltage Vout at an output of the circuit from an input voltage Vin at an input of the circuit is described. The circuit further comprises a boosting capacitor coupled at a first side to the output node of the first P-type switch and coupled at a second side to a capacitor control signal. Furthermore, the circuit comprises control circuitry configured to provide a capacitor control-signal-which alternates between a low level and a high level, and configured to generate first and second control signals based on the capacitor control signal for alternating the first and second P-type switches between on-states and off-states, respectively, such that electrical energy is transferred from the input to the output of the circuit using the boosting capacitor.Type: GrantFiled: June 27, 2014Date of Patent: August 18, 2015Assignee: Dialog Semiconductor GmbHInventors: Celal Avci, Kemal Ozanoglu, Serhan Eroz, Emre Topcu
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Publication number: 20150177760Abstract: A method and a system for increasing the open loop gain of linear regulators is presented. A linear regulator configured to derive an output voltage from an input voltage is described. The linear regulator comprises an amplifier configured to derive an amplifier output signal from an amplifier input signal, and a pass device configured to convert the amplifier output signal into the output voltage. The linear regulator comprises a positive feedback loop using a positive feedback gain ?, and a negative feedback loop using a negative feedback gain ?. In addition, the linear regulator comprises a combining unit configured to determine the amplifier input signal from the input voltage, from the positive feedback signal and from the negative feedback voltage. A transfer function of the linear regulator exhibits a first and a second pole at a first frequency wp1 and at a second frequency wp2, respectively.Type: ApplicationFiled: September 24, 2014Publication date: June 25, 2015Inventors: Kemal Ozanoglu, Merve Toka, Selcuk Talay, Frank Kronmueller
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Publication number: 20150102854Abstract: The present document relates to charge pump voltage doublers for use in integrated circuits. A charge pump circuit configured to generate an output voltage Vout at an output of the circuit from an input voltage Vin at an input of the circuit is described. The circuit further comprises a boosting capacitor coupled at a first side to the output node of the first P-type switch and coupled at a second side to a capacitor control signal. Furthermore, the circuit comprises control circuitry configured to provide a capacitor control-signal-which alternates between a low level and a high level, and configured to generate first and second control signals based on the capacitor control signal for alternating the first and second P-type switches between on-states and off-states, respectively, such that electrical energy is transferred from the input to the output of the circuit using the boosting capacitor.Type: ApplicationFiled: June 27, 2014Publication date: April 16, 2015Inventors: Celal Avci, Kemal Ozanoglu, Serhan Eroz, Emre Topcu
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Patent number: 7564638Abstract: An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit is asymmetric, including two input transistors of different transistor types. For instance, a first of the two input transistors of each differential amplifier circuit may be a bipolar transistor and a second of the two input transistors may be a field effect transistor. By utilizing asymmetric differential amplifier circuits, a relatively wider operating frequency range is obtained.Type: GrantFiled: May 23, 2006Date of Patent: July 21, 2009Assignee: STMicroelectronics, Inc.Inventors: Baris Posat, Kemal Ozanoglu, Alessandro Venca
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Patent number: 7274523Abstract: A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and an output buffer outputting a reader output to a read channel that is filtered of thermal asperity transients by a high pass filter positioned between the input gain stage and the output buffer. The high pass filter is voltage controlled based on an input control signal from a filter controller. The filter controller uses a low pass filter functioning as a peak detector to detect peaks in either the input or output voltage of the high pass filter. The low pass filter output is applied to a non-linear function generator generating the control signal for the high pass filter based on an increasing function of the absolute value of the low pass filter output.Type: GrantFiled: March 31, 2004Date of Patent: September 25, 2007Assignee: STMicroelectronics, Inc.Inventors: Kemal Ozanoglu, Baris Posat, Roberto Allni
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Publication number: 20060262446Abstract: An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit is asymmetric, including two input transistors of different transistor types. For instance, a first of the two input transistors of each differential amplifier circuit may be a bipolar transistor and a second of the two input transistors may be a field effect transistor. By utilizing asymmetric differential amplifier circuits, a relatively wider operating frequency range is obtained.Type: ApplicationFiled: May 23, 2006Publication date: November 23, 2006Inventors: Baris Posat, Kemal Ozanoglu, Alessandro Venca
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Patent number: 7099098Abstract: An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit is asymmetric, including two input transistors of different transistor types. For instance, a first of the two input transistors of each differential amplifier circuit may be a bipolar transistor and a second of the two input transistors may be a field effect transistor. By utilizing asymmetric differential amplifier circuits, a relatively wider operating frequency range is obtained.Type: GrantFiled: January 22, 2003Date of Patent: August 29, 2006Assignee: STMicroelectronics, Inc.Inventors: Baris Posat, Kemal Ozanoglu, Alessandro Venca
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Patent number: 6970316Abstract: A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit includes switching circuitry connected between the terminals of the write head and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry that generates control signals for controlling the switching circuitry.Type: GrantFiled: November 9, 2001Date of Patent: November 29, 2005Assignee: STMicroelectronics, Inc.Inventors: Alessandro Venca, Baris Posat, Kemal Ozanoglu, Roberto Alini
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Publication number: 20050219725Abstract: A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and an output buffer outputting a reader output to a read channel that is filtered of thermal asperity transients by a high pass filter positioned between the input gain stage and the output buffer. The high pass filter is voltage controlled based on an input control signal from a filter controller. The filter controller uses a low pass filter functioning as a peak detector to detect peaks in either the input or output voltage of the high pass filter. The low pass filter output is applied to a non-linear function generator generating the control signal for the high pass filter based on an increasing function of the absolute value of the low pass filter output.Type: ApplicationFiled: March 31, 2004Publication date: October 6, 2005Inventors: Kemal Ozanoglu, Baris Posat, Roberto Allni
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Patent number: 6944834Abstract: A method and system are disclosed for generating descriptions of circuits representative of the behavior of dynamic systems. A state space model representing a dynamic system may be used to generate an electronic circuit equivalent having operating characteristics equivalent to the operating characteristics of the dynamic system. The electronic circuit equivalent may be then described as a SPICE circuit description which is simulated to determine the time and frequency domain characteristics of the dynamic system.Type: GrantFiled: January 22, 2003Date of Patent: September 13, 2005Assignee: STMicroelectrontronics, Inc.Inventors: Baris Posat, Kemal Ozanoglu, Alessandro Venca
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Publication number: 20040141248Abstract: An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit is asymmetric, including two input transistors of different transistor types. For instance, a first of the two input transistors of each differential amplifier circuit may be a bipolar transistor and a second of the two input transistors may be a field effect transistor. By utilizing asymmetric differential amplifier circuits, a relatively wider operating frequency range is obtained.Type: ApplicationFiled: January 22, 2003Publication date: July 22, 2004Inventors: Baris Posat, Kemal Ozanoglu, Alessandro Venca
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Publication number: 20040143800Abstract: A method and system are disclosed for generating descriptions of circuits representative of the behavior of dynamic systems. A state space model representing a dynamic system may be used to generate an electronic circuit equivalent having operating characteristics equivalent to the operating characteristics of the dynamic system. The electronic circuit equivalent may be then described as a SPICE circuit description which is simulated to determine the time and frequency domain characteristics of the dynamic system.Type: ApplicationFiled: January 22, 2003Publication date: July 22, 2004Inventors: Baris Posat, Kemal Ozanoglu, Alessandro Venca
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Publication number: 20030090828Abstract: A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit includes switching circuitry connected between the terminals of the write head and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry that generates control signals for controlling the switching circuitry.Type: ApplicationFiled: November 9, 2001Publication date: May 15, 2003Inventors: Alesandro Venca, Baris Posat, Kemal Ozanoglu, Roberto Alini