Fairchild Semiconductor Patent Grants

Window reference trimming for accessory detection

Granted: May 16, 2017
Patent Number: 9654089
This document discusses, among other things, a detection circuit configured to receive an output of a window comparator over a range of input values and to measure a difference between first and second thresholds of the window comparator, and a trim circuit configured to adjust at least one of the first or second thresholds using the measured difference between the first and second thresholds.

Apparatus and methods for PLL-based gyroscope gain control, quadrature cancellation and demodulation

Granted: May 9, 2017
Patent Number: 9644963
This application discusses simplified interface circuits for a gyroscope. In an example, an interface can include an automatic gain control (AGC) circuit configured to couple to driver for a proof mass of a gyroscope sensor and to drive the proof-mass to oscillate at a predefined oscillation amplitude, and a phase-locked loop (PLL) configured to receive sensed oscillation information from the proof-mass and to provide at least a first phase signal synchronized with a sinusoidal waveform…

Dual-mode voltage doubling buck converter with smooth mode transition

Granted: May 9, 2017
Patent Number: 9647546
Devices and methods provide a voltage regulating device including voltage supply circuitry configured to receive a first voltage, generate at least a second voltage based on the first voltage, and output an output voltage, the output voltage being one of the first voltage and the second voltage based on a voltage selection signal; regulator circuitry configured to switch between the output voltage and a reference potential based on a control signal; and control circuitry configured to…

Enable and disable comparator voltage reference

Granted: April 25, 2017
Patent Number: 9635453
This document discusses, among other things, systems and methods to reduce power use of an accessory detection device. The accessory detection device can be configured to be coupled to a mobile device having an audio jack configured to be coupled to a mobile device accessory having a send/end key. In an example, the accessory detection device can include a comparator and a switch. The comparator can be configured to receive mobile device accessory information from the mobile device…

MEMS quadrature cancellation and signal demodulation

Granted: April 18, 2017
Patent Number: 9625272
In certain examples, a quadrature cancellation apparatus can include a drive charge amplifier configured to couple to a proof mass of a MEMS device and to provide oscillation motion information, a first sense charge amplifier configured to couple to the proof mass and to provide first sense information of a first movement of the MEMS device, a first programmable amplifier configured to receive the oscillation motion information and provide amplified oscillation motion information, a…

MEMS device automatic-gain control loop for mechanical amplitude drive

Granted: April 11, 2017
Patent Number: 9618361
This document discusses, among other things, apparatus and methods for digital automatic gain control for driving a MEMS device, such as a proof mass. In an example, an apparatus can include a driver configured to oscillate a proof mass of a MEMS device, a charge-to-voltage (C2V) converter configured to provide oscillation information of the proof mass, an analog-to-digital converter (ADC) configured to provide a digital representation of the oscillation information, and a digital,…

Adaptive response time acceleration

Granted: April 11, 2017
Patent Number: 9618920
This document discusses among other things, methods and apparatus to conserve energy when providing proximity information. An example apparatus can include an energy emitter configured to emit a first pulse of energy, an energy sensor configured to receive reflected energy from the first pulse of energy, a control circuit including a processor, the processor configured to provide first proximity information of the apparatus with respect to an object using the reflected energy. The…

Schottky-barrier device and related semiconductor product

Granted: March 28, 2017
Patent Number: 9608056
In one general aspect, a power rectifier device can include a drift layer including silicon carbide of n-type conductivity, and a Schottky electrode disposed on the drift layer where the Schottky electrode and a surface of the drift layer can provide a Schottky contact. The power rectifier device can also include an array of p-type regions disposed underneath the Schottky electrode.

Audio jack insertion/removal fault detection

Granted: March 28, 2017
Patent Number: 9609447
This document discusses, among other things, circuits and methods for providing an indication of an impedance between a detecting pin and a first signal pin of an audio socket using first and second comparators to, among other things, determine if moisture is present in the audio socket. If moisture is present in the audio socket, communication between an audio processing unit and the audio socket can be disabled.

MEMS proof mass with split Z-axis portions

Granted: March 21, 2017
Patent Number: 9599472
This document discusses among other things apparatus and methods for a proof mass including split z-axis portions. An example proof mass can include a center portion configured to anchor the proof-mass to an adjacent layer, a first z-axis portion configure to rotate about a first axis using a first hinge, the first axis parallel to an x-y plane orthogonal to a z-axis, a second z-axis portion configure to rotate about a second axis using a second hinge, the second axis parallel to the x-y…

Superjunction structures for power devices

Granted: March 14, 2017
Patent Number: 9595596
In one general aspect, a power device can include an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type. The power device can include a termination region surrounding at least a portion of the active region and can have a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type. Each of the plurality of pillars of…

Multi-die MEMS package

Granted: March 7, 2017
Patent Number: 9586813
This document refers to multi-die micromechanical system (MEMS) packages. In an example, a multi-die MEMS package can include a controller integrated circuit (IC) configured to couple to a circuit board, a MEMS IC mounted to a first side of the controller IC, a through silicon via extending through the controller IC between the first side and a second side of the controller IC, the second side opposite the first side, and wherein the MEMS IC is coupled to the through silicon via.

SiC bipolar junction transistor with reduced carrier lifetime in collector and a defect termination layer

Granted: March 7, 2017
Patent Number: 9590047
A method of manufacturing a silicon carbide (SiC) bipolar junction transistor (BJT) and a SiC BJT (100) are provided. The SiC BJT comprises an emitter region (150), a base region (140) and a collector region (120). The collector region is arranged on a substrate (110) having an off-axis orientation of about 8 degrees or lower. A defect termination layer (DTL, 130) for terminating dislocations originating from the substrate is arranged between the substrate and the collector region. The…

Fast load transient response power supply system using dynamic reference generation

Granted: March 7, 2017
Patent Number: 9590501
The present disclosure is directed to a fast load transient response power supply system using dynamic reference voltage generation. A system may comprise, for example, at least power supply circuitry, voltage reference circuitry and dynamic reference generation circuitry. The power supply circuitry may be configured to generate an output voltage (e.g., for driving a load) based on a power supply input voltage. The voltage reference circuitry may be configured to generate a reference…

Audio jack detection circuit

Granted: March 7, 2017
Patent Number: 9591421
This document discusses, among other things, a detection system configured to identify a type of a pole of a four-pole audio jack using first and second comparators. The detection system can include a bias circuit configured to bias a detection input coupled to the pole, and first and second comparators configured to compare the detection input to respective first and second thresholds to provide an indication of the type of the pole.

Semiconductor die package including low stress configuration

Granted: February 28, 2017
Patent Number: 9583454
A semiconductor die package. The semiconductor die package comprises a semiconductor die and a molded clip structure comprising a clip structure and a first molding material covering at least a portion of the clip structure. The first molding material exposes an outer surface of the clip structure. The clip structure is electrically coupled to the semiconductor die. The semiconductor die package further comprises a leadframe structure comprising a die attach pad and a plurality of leads…

Adaptive critical-duty-cycle clamp for power converters

Granted: February 28, 2017
Patent Number: 9584020
Devices and methods provide a duty cycle clamping device for preventing an output voltage of a power converter from decreasing as the duty cycle of a pulse width modulation (PWM) signal driving the power converter increases, the clamping device including duty cycle clamping circuitry configured to determine a critical duty cycle for the PWM signal based on an input voltage, a top voltage of a flying capacitor and a bottom voltage of the flying capacitor, and configured to clamp an actual…

Dual-edge tracking synchronous rectifier control techniques for a resonant converter

Granted: February 28, 2017
Patent Number: 9584035
This disclosure provides control techniques for a resonant converter. In one control technique, for switching speeds that are below the resonant frequency of the primary stage of the converter, the switches of the synchronous rectifier (SR) portion (SR switches) of the resonant converter are controlled based on a rising edge of the corresponding primary side switch and the turn off time of a corresponding SR switch. In general, for below resonance operation, each corresponding SR switch…

Apparatus and method for recovering from partial insertion of an audio jack

Granted: February 28, 2017
Patent Number: 9584893
Apparatus and methods for recovering from an audio jack connection anomaly such as a partial insertion of an audio jack plug with an audio jack receptacle are provided. In an example, a method can include detecting a valid audio jack connection of an audio jack receptacle and an audio jack plug, detecting a change in a state of a detect switch associated with the audio jack connection, applying an oscillating signal to a microphone terminal associated with the audio jack connection,…

Silicon carbide power bipolar devices with deep acceptor doping

Granted: February 21, 2017
Patent Number: 9577045
In a general aspect, a power semiconductor device can include a collector region disposed on a substrate, the collector region can include n-type silicon carbide (SiC). The power semiconductor device can also include a base region disposed on the collector region. The base region can include p-type SiC doped with gallium. The power semiconductor device can include an emitter region disposed on the base region. The emitter region can include n-type SiC carbide.