Sandisk Technologies Inc.

Western Digital (Fremont), Inc.

Iml International

Integrated Memory Logic, Inc.

Henry H Yuan

Ekram Bhuiyan

Steve Chi

Mohamad Towfik Krounbi

Jinqiu Zhang

Lien-Chang Wang

Ming Zhao

Wei Zhang

Ding Hsu Yen

A switching rectifier circuit includes a pulse width modulation controller, a voltage switching circuit, a pulse width modulation comparator, an error amplifier, a voltage reference, a high threshold voltage comparator and a low threshold voltage comparator. A varying output voltage of the voltage regulator is sampled and compared to a high threshold voltage reference and a low threshold voltage reference. When the sampled output voltage is equal to or greater than the high threshold voltage reference the output voltage is decreased. When the sampled output voltage is equal to or less than the low threshold voltage reference the output voltage is increased.

Fast response pulse width modulation control for switching regulator

A system and method of providing an analog make before break circuit includes a first transistor coupled in series with a second transistor, the first transistor being configured for conducting a high portion of an input signal, the second transistor being configured for conducting a low portion of the input signal. A third transistor is configured to interrupt a connection between the input signal and a first transistor input node, the third transistor having a third transistor threshold voltage between of about 90 and about 110 percent of a second transistor threshold voltage. A fourth transistor is configured to interrupt a connection between the input signal and a second transistor input node, the fourth transistor having a fourth transistor threshold voltage of between about 90 and about 110 percent of a first transistor threshold voltage.

Analog break before make system, method and apparatus

A soft-start generation system is configured to generate a soft-start voltage. The soft-start generation system includes sawtooth circuitry configured to generate current having a sawtooth waveform and staircase circuitry configured to generate current having an ascending staircase waveform. A ramp-up current may be generated that is a combination of the sawtooth current and the staircase current. The ramp-up current may continuously ramp up to a predetermined current level. The soft-start voltage may be generated based on the ramp-up current.

Digital soft start with continuous ramp-up

Various circuits, including DC/DC converters can include an integrated soft-start circuit. The integrated soft-start circuit includes a PMOS transistor configured to receive a reference signal and control the current to a bipolar junction transistor when the reference signal is in a first state. First and second NMOS transistors are included in the soft-start circuit, and receive the reference signal to turn off (to release from reset) when the reference signal is in the first state. A capacitor coupled in parallel with one of the NMOS transistors controls the soft-start signal. Various different transistors types can be used depending on the desired implementation.

Integrated soft start circuits

A current mode direct current-to-direct current (DC-to-DC) voltage regulator controls its output voltage using a pulse width modulation (PWM) circuit that employs a non-linear compensation ramp. By employing such a PWM circuit, the output voltage can be controlled more robustly over a wider range of operating conditions.

Non-linear compensation ramp for current mode pulse width modulation

A method is provided for fabricating a read element with leads that overlay a top surface of a sensor of the read element. The method includes forming a mask over a sensor layer, then using the mask to define the sensor from the sensor layer. The mask is then narrowed and a lead layer is formed that overlays both ends of the top surface of the sensor without covering a center portion of the top surface.

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Fremont, CA, United States of America

Henry H Yuan