Abstract: A light emitting diode control circuit includes a power transistor, a voltage controller, a first resistor, an inductor, a first diode, a second resistor, a third resistor, and a voltage regulation module. The voltage controller outputs a gate control signal to the control terminal of the power transistor. The first resistor is coupled to the power transistor. The inductor is coupled to the first resistor. The light emitting diodes are coupled to the inductor. The first diode is coupled between a power input terminal and the power transistor. The second resistor is coupled to another power input terminal and the voltage controller. The voltage regulation module is coupled to the voltage controller and the third resistor. The voltage regulation module includes a plurality of light emitting diodes and provides the supply voltage.

Abstract: A spike-free converter for driving light-emitting diodes includes a closed loop direct current-direct current (dc-dc) converting unit, a switch, a first inductor, and a first diode. The closed loop dc-dc converting unit is used for generating a driving voltage to drive at least one light-emitting diode strings according to a dc voltage, and generating a switch control signal. The switch is used for receiving the switch control signal and being turned on and turned off according to the switch control signal.

Abstract: A spike-free converter for driving light-emitting diodes includes a closed loop direct current-direct current (dc-dc) converting unit, a switch, a first inductor, and a first diode. The closed loop dc-dc converting unit is used for generating a driving voltage to drive at least one light-emitting diode strings according to a dc voltage, and generating a switch control signal. The switch is used for receiving the switch control signal and being turned on and turned off according to the switch control signal.

Abstract: An electronic ballast includes a rectifier circuit, having two output terminals coupled to a first node and a second node; a first capacitor having two ends coupled to the first node and the second node; an inverter, having a first terminal coupled to the first node, a second terminal coupled to the second node and a third terminal; an inductor, having a first end coupled to the third terminal of the inverter and a second end for coupling a first terminal of a lamp; a second capacitor, having two ends for coupling a second terminal and a third terminal of the lamp; a third capacitor, having two ends coupled to the first node and a third node, wherein the third node is further for coupling a fourth terminal of the lamp; and a diode, having two ends coupled to the third node and the second node.

Abstract: A variable-inductor electronic ballast includes a generic ballast and a variable-inductor controller. The variable-inductor controller includes either an additive-inductor or a subtractive-capacitor embodiment. An optional winding to the existing transformer can enhance the ratio of power steps.

Abstract: An electronic ballast includes a rectifier circuit having a first output terminal for coupling with a lamp; a first inductor coupled with a first node; a resonant network coupled with the first node; a first capacitor coupled with the first node; a first resistor coupled with a second node; a second resistor coupled with a second output terminal of the rectifier circuit; a power switch having an output end, a ground end and a control end, wherein the output end is coupled with the first node and the ground end is coupled with the second resistor; a voltage divider for driving the power switch; and a second inductor coupled between the second node and the control end of the power switch.

Abstract: An electronic ballast includes a rectifier circuit, having two output terminals coupled to a first node and a second node; a first capacitor having two ends coupled to the first node and the second node; an inverter, having a first terminal coupled to the first node, a second terminal coupled to the second node and a third terminal; an inductor, having a first end coupled to the third terminal of the inverter and a second end for coupling a first terminal of a lamp; a second capacitor, having two ends for coupling a second terminal and a third terminal of the lamp; a third capacitor, having two ends coupled to the first node and a third node, wherein the third node is further for coupling a fourth terminal of the lamp; and a diode, having two ends coupled to the third node and the second node.

Abstract: An electronic ballast includes a rectifier circuit having a first output terminal for coupling with a lamp; a first inductor coupled with a first node; a resonant network coupled with the first node; a first capacitor coupled with the first node; a first resistor coupled with a second node; a second resistor coupled with a second output terminal of the rectifier circuit; a power switch having an output end, a ground end and a control end, wherein the output end is coupled with the first node and the ground end is coupled with the second resistor; a voltage divider for driving the power switch; and a second inductor coupled between the second node and the control end of the power switch.

Abstract: A gain stage is disclosed. The gain stage comprises a first stage that provides two voltages of equal and opposites polarities and a plurality of devices cross coupled to the first stage. The plurality of devices minimize the Miller Effect capacitance in the differential stage by providing an out-of-phase signal to the first stage. Accordingly, a system and method in accordance with the present invention utilizes an at least one extra device on the same die as the first stage to provide an impedance match. In so doing, a broadband cancellation of the Miller Effect is achieved. Moreover, the matching is valid over an extended temperature range.

Abstract: A mixer is disclosed. The mixer comprises a high isolation gain stage and an impedance transformation network coupled to the gain stage. The mixer includes a plurality of switching devices coupled to the network and a phase shifter coupled to the plurality of switching devices. The mixer is utilized as a receiver and a low noise amplifier is not needed. A receiver in accordance with the present invention achieves high gain and low noise in the mixer and therefore eliminates the need for a separate LNA. In so doing, an isolation gain stage achieves high gain, and image noise is rejected before entering the mixer stage.

Abstract: An inductive structure for an integrated circuit. The inductor has a first turn that shields the other turns of the inductor from a proximate ground plane. Multiple turns are disposed one above another in respective metalization layers of the integrated circuit. The turns are partial loops and are electrically coupled end-to-end with vias. Predetermined ones of the turns have additional portions in different layers. An additional portion of a turn is an electrically conductive strip deposited above the turn in a higher metalization layer and electrically coupled to the turn, thereby increasing the surface area of the turn and decreasing resistance of the turn. A buried n-type loop disposed below the first turn and below the surface of the substrate shields the first turn from the capacitive effects of the substrate.

Abstract: A balun circuit comprising a first signal source connected across a first inductive means and connected to the latter a first capacitive means. To that network are connected a second signal source, a second inductive means, and a load to be matched to the signal sources. With the right choice of component values to produce a resonant condition, a balun that interfaces two balanced signal sources to an unbalanced single-ended load results capable of low insertion loss, arbitrary impedance transformation ratio, testability in the form of a 50 ohm port for in-circuit power monitoring and circuit characterization, class E operation, and easy implementation, as only standard L and C components are necessary. The circuit is reversible for connecting a single source to a balanced load.

Abstract: A system for electrically heating a volume of windshield cleaning fluid in a motor vehicle includes a metallic vessel connected between a windshield fluid reservoir and a nozzle for spraying the windshield with the fluid. The vessel has a metal heater wall heated by PTC thermistors thereon and provided with a plurality of metal heat exchange pins extending into an internal chamber in the vessel through which the fluid flows to be heated. A control circuit is provided and includes an electronic timer circuit for controlling the length of time the thermistors are energized to heat the fluid in accordance with the prevailing ambient temperature, an engine speed sensor including a pulse stretching circuit for preventing energization of the thermistors if the engine of the vehicle is not running, and a differential input circuit for simplifying the attachment of the system to a standard windshield cleaning fluid pump.

Abstract: An acoustic delay line device for microwave equipment includes a cylindrical acoustic substrate. A transducer array including four transducers located at the corners of a square is formed on each end of the cylinder. The four transducers are electrically connected in series top-to-top and bottom-to-bottom so that adjacent transducers are of opposite polarity and dipoles are formed diagonally. The first and last transducer in the series are connected electrically to the outside source of receiver of RF signals by bonding pads which are offset from the transducers, and by connection wires bonded to the bonding pads. A ground plane area is provided on both ends of the acoustic substrate surrounding each transducer array.