Micrel Patent Applications

BUCK DC-DC CONVERTER WITH FIXED FREQUENCY

Granted: October 1, 2015
Application Number: 20150280557
A buck switching regulator implements a fixed frequency feedback control circuit including a voltage control loop and a frequency control loop to regulate the switching frequency of the buck switching regulator to a fixed or nearly fixed frequency. The voltage control loop, implementing ripple mode control, is configured to control the power switches in response to the switching regulator output voltage or a signal related to the switching regulator output voltage. The frequency control…

HYSTERETIC BUCK DC-DC CONVERTER

Granted: September 17, 2015
Application Number: 20150263617
A buck switching regulator includes a feedback control circuit using a four-input comparator to regulate the output voltage to a substantially constant level with reduced voltage offset and with fast transient response. In some embodiments, the buck switching regulator uses the four-input comparator to compare a first feedback signal without ripple and a second feedback signal with injected ripple components to a reference level. The four-input comparator generates an output signal to…

PLANAR VERTICAL DMOS TRANSISTOR WITH A CONDUCTIVE SPACER STRUCTURE AS GATE

Granted: June 11, 2015
Application Number: 20150162430
A planar vertical DMOS transistor uses a conductive spacer structure formed on the sides of a dielectric structure as the gate of the transistor. The planar vertical DMOS transistor with a conductive spacer gate structure reduces the parasitic gate-to-bulk or gate-to-drain overlap capacitance by eliminating the conductive gate material that is formed above the bulk of the semiconductor layer. Meanwhile, the desired distance between the body regions formed on opposing sides of the…

PLANAR VERTICAL DMOS TRANSISTOR WITH REDUCED GATE CHARGE

Granted: June 11, 2015
Application Number: 20150162431
A planar vertical DMOS transistor includes a dielectric separation structure formed under the conductive gate and over the bulk of the semiconductor layer outside of the channel region of the transistor. The planar vertical DMOS transistor with a conductive gate formed over the dielectric structure reduces the parasitic gate-to-bulk or gate-to-drain overlap capacitance by increasing the separation between the conductive gate and the bulk of the semiconductor layer. Meanwhile, the desired…

TIMER BASED PFM EXIT CONTROL METHOD FOR A BOOST REGULATOR

Granted: April 2, 2015
Application Number: 20150091544
A control circuit in a PFM/PWM boost switching regulator includes a timer based PFM exit control circuit configured to receive a first control signal for controlling a main power switch, a zero-cross signal indicative of an inductor current having reached zero current value, and a timer reference signal indicative of a timer threshold duration. The timer based PFM exit control circuit assesses an idle time of the inductor current based on the first control signal and the zero-cross…

HIGH BANDWIDTH PSRR POWER SUPPLY REGULATOR

Granted: November 6, 2014
Application Number: 20140327416
A voltage regulator includes a power device formed by an NMOS transistor having a drain terminal coupled to an input voltage, a source terminal providing an output voltage and a gate terminal receiving a gate drive signal; and an integrated AC/DC control loop configured to access the output voltage and to generate the gate drive signal based on a value of the output voltage in relation to a first reference voltage and a second reference voltage. The AC control portion generates a gate…

SIGNAL LEVEL DETECT CIRCUIT WITH REDUCED LOSS-OF-SIGNAL ASSERTION DELAY

Granted: September 25, 2014
Application Number: 20140286649
A signal level detect circuit configured to assess an input signal with varying amplitude signal levels and to generate an indicator signal includes an input circuit configured to receive the input signal and to process the input signal, the input circuit including a first node on which the input signal is sampled; a comparator configured to compare the processed input signal to a signal level threshold and generate a comparator output signal; and an active discharge circuit configured…

Method for Processing Infusion Data and an Infusion Pump System

Granted: August 21, 2014
Application Number: 20140236119
A distributed infusion pump system is provided with long-term recording of the type of medication, nutrition or hydration, pump output pressure, corresponding infusion flow, infusion flow resistance, and an automatic or manual alarm in the event that thresholds applied to these parameters or their derivatives are exceeded.

Lock Connection Device for Medical Fluid Lines

Granted: July 24, 2014
Application Number: 20140207118
Described is a lock connection device for medical fluid lines comprising a first connector for coupling a first medical fluid line and a second connector for coupling a second medical fluid line, wherein both connectors are adapted for releasable attachment to each other. The device comprises a first closing member adapted to be releasably attached to the first connector so as to close it, and a second closing member adapted to be releasably attached to the second connector so as to…

HIGH COMPLIANCE LASER DRIVER CIRCUIT

Granted: June 5, 2014
Application Number: 20140153598
A laser driver circuit having a differential circuit and an output circuit includes a control circuit receiving a regulated supply voltage that also supplies the differential circuit as an input signal. The control circuit generates a feedback voltage across a first resistor to cause a first current to flow in the first resistor having a current value equal or proportional to the modulation current value. The laser driver circuit includes an operational amplifier receiving the feedback…

BUCK DC-DC CONVERTER WITH ACCURACY ENHANCEMENT

Granted: May 15, 2014
Application Number: 20140132232
A buck switching regulator includes a feedback control circuit including a first gain circuit generating a first feedback signal indicative of the regulated output voltage; a ripple generation circuit generating a ripple signal that is injected to the first feedback signal; and a comparator receiving a first reference signal and the first feedback signal to generate a comparator output signal. The switching regulator further includes an offset compensation circuit including a second gain…

ESD PROTECTION FOR MEMS RESONATOR DEVICES

Granted: April 24, 2014
Application Number: 20140113396
Disclosed herein are MEMS resonator device designs and fabrication techniques that provide protection against electrostatic charge imbalances. In one aspect, a MEMS resonator device includes a substrate, an electrode including a first microstructure supported by the substrate, a resonant element including a second microstructure spaced from the first microstructure by a gap for resonant displacement of the second microstructure within the gap during operation, and a disabled shunt…

Infusion Rotary Peristaltic Pump

Granted: March 20, 2014
Application Number: 20140081202
An infusion pump comprises at least three operating layers. A first layer includes epicyclic gear means comprising a rotatable central gear, a stationary outer ring gear, and movable planet gears arranged between the central gear and the ring gear in movable engagement with the central and ring gears. A second layer includes roller bearing means comprising a stationary outer ring and a movable inner roller arrangement in movable arrangement with the outer ring and coupled with the…

CONSTANT VOLTAGE SUPPLY CONSTRUCTED USING A CONSTANT CURRENT BOOST CONTROLLER

Granted: March 13, 2014
Application Number: 20140070783
A constant voltage supply uses a constant current boost switching controller to generate an output voltage having a substantially constant voltage magnitude. The constant voltage supply thus constructed realizes fast transient response with small output capacitance.

Current Sensing Using a Metal-on-Passivation Layer on an Integrated Circuit Die

Granted: December 19, 2013
Application Number: 20130334662
A current sense resistor integrated with an integrated circuit die where the integrated circuit die is housed in a flip-chip semiconductor package includes a metal layer formed over a passivation layer of the integrated circuit die where the metal layer having an array of metal pillars extending therefrom. The metal pillars are electrically connected to a first leadframe portion and a second leadframe portion of the semiconductor package where the first leadframe portion and the second…

METAL-ON-PASSIVATION RESISTOR FOR CURRENT SENSING IN A CHIP-SCALE PACKAGE

Granted: December 19, 2013
Application Number: 20130334663
A current sense resistor integrated with an integrated circuit die housed in a chip-scale semiconductor package includes a metal layer formed over a passivation layer of the integrated circuit die where the metal layer having an array of metal pillars extending therefrom. The metal pillars are to be electrically connected to a first conductive electrode and a second conductive electrode external to the chip-scale semiconductor package where the first conductive electrode and the second…

Bi-Directional Comparator

Granted: December 19, 2013
Application Number: 20130335119
A bi-directional comparator compares two input signals and applies a hysteresis level to the smaller input signal only after the output signal switches logical states and when the two input signals are within a predetermined range of each other. In one embodiment, the hysteresis applied to the smaller input signal is removed when the two input signals are no longer within the predetermined range of each other.

LDMOS TRANSISTOR WITH ASYMMETRIC SPACER AS GATE

Granted: November 28, 2013
Application Number: 20130316508
The present invention provides a laterally diffused metal oxide semiconductor (LDMOS) transistor and a method for fabricating it. The LDMOS transistor includes an n-type epitaxial layer formed on a p-type substrate, and an asymmetric conductive spacer which acts as its gate. The LDMOS transistor also includes a source and a drain region on either side of the asymmetric conductive spacer, and a channel region formed by ion-implantation on the asymmetric conductive spacer. The height of…

PUMP AND PREFILLED BAG/ANAESTHESIA - ANALGESIA SET

Granted: November 7, 2013
Application Number: 20130296784
The invention is directed to an analgesia and/or an anesthesia drug/device, system and an analgesic and/or an anaesthetic method utilizing a drug storage bag prefilled pharmaceutically or in a pharmaceutical compounding facility with a drug which system or method involves long-term stability of the thug prefilled storage bag, thus enabling the simplification of both, home treatment and hospital treatment procedures, in particular, the system or method is utilizing a storage bag…

Noise Discriminator for Enhanced Noise Detection In A Passive Optical Network Burst Mode Receiver

Granted: October 24, 2013
Application Number: 20130279903
A noise discriminator circuit and a noise discrimination method in a burst mode receiver is configured to determine the validity of an incoming burst signal by analyzing the timing of the signal edges of incoming signal to look for a time duration conforming to the preamble data bits of a valid burst signal. In one embodiment, the noise discriminator circuit and method analyze the time duration between signal edges of the same pulse of an incoming signal. In another embodiment, the noise…