Abstract: A series-switch bridgeless power supply provides common-mode EMI filtering. The power supply includes a center-tapped inductive device bifurcated into first and second windings. The AC input, provided at first and second input terminals, is applied to the center-tap of the inductive device. First and second switches are connected to distal ends of the first and second windings, respectively, and are connected in series with one another to form a circuit path from the first input terminal, through the inductive device and each of the series-connected switches, back through the inductive device and to the second input terminal. A controller turns the switches On and Off to modulate the current through the inductive device. Common-mode voltage generated by the modulation of the first and second switches is filtered by connection of each switch to a junction defined between a pair of capacitors connected in series between the first and second input terminal.

Abstract: A series-switch bridgeless power supply provides common-mode EMI filtering. The power supply includes a center-tapped inductive device bifurcated into first and second windings. The AC input, provided at first and second input terminals, is applied to the center-tap of the inductive device. First and second switches are connected to distal ends of the first and second windings, respectively, and are connected in series with one another to form a circuit path from the first input terminal, through the inductive device and each of the series-connected switches, back through the inductive device and to the second input terminal. A controller turns the switches On and Off to modulate the current through the inductive device. Common-mode voltage generated by the modulation of the first and second switches is filtered by connection of each switch to a junction defined between a pair of capacitors connected in series between the first and second input terminal.

Abstract: A lighting system includes at least first and second light sources providing first and second colors of light. Control circuitry is operatively coupled to the first and second light sources, and is configured to control the first and second light sources relative to one another to provide a color point that is linearly controlled to approximate a non-linear target lighting behavior in the CIE 1931 color space.

Abstract: One or more micromachined (MEMS) switches switch attenuators, such as resistors, into or out of a signal path, such as of a test instrument. The MEMS switches can be fabricated on the same substrate as the attenuators, or the switches or attenuators can be mounted on the same substrate as the others are fabricated. An instrument probe includes attenuators and MEMS switches that are controlled by the instrument and/or by a control circuit in the probe. Optionally, the probe includes reactive elements, such as capacitors, and MEMS switches to compensate for electrical characteristics of the probe and/or probe lead, and the probe or a test instrument automatically sets the MEMS switches to connect appropriate ones of the reactive elements to a signal path within the probe.

Abstract: One or more micromachined (MEMS) switches switch attenuators, such as resistors, into or out of a signal path, such as of a test instrument. The MEMS switches can be fabricated on the same substrate as the attenuators, or the switches or attenuators can be mounted on the same substrate as the others are fabricated. An instrument probe includes attenuators and MEMS switches that are controlled by the instrument and/or by a control circuit in the probe. Optionally, the probe includes reactive elements, such as capacitors, and MEMS switches to compensate for electrical characteristics of the probe and/or probe lead, and the probe or a test instrument automatically sets the MEMS switches to connect appropriate ones of the reactive elements to a signal path within the probe.

Abstract: Versatile control pin electronics are disclosed. The control pin electronics are coupled to a control pin and allow for the passing of both analog and digital control signals. The control pin electronics work with digital logic having logic levels that are compatible with analog signals having predefined voltage and current limits. The versatile control pin electronics include both a voltage regulator that sets a regulated voltage at the control pin and a current limiter. The versatile control pin electronics can be coupled to a comparator to provide both hysteresis and latching functionality from a single pin.

Abstract: One or more micromachined (MEMS) switches switch attenuators, such as resistors, into or out of a signal path, such as of a test instrument. The MEMS switches can be fabricated on the same substrate as the attenuators, or the switches or attenuators can be mounted on the same substrate as the others are fabricated. An instrument probe includes attenuators and MEMS switches that are controlled by the instrument and/or by a control circuit in the probe. Optionally, the probe includes reactive elements, such as capacitors, and MEMS switches to compensate for electrical characteristics of the probe and/or probe lead, and the probe or a test instrument automatically sets the MEMS switches to connect appropriate ones of the reactive elements to a signal path within the probe.

Abstract: One or more micromachined (MEMS) switches switch attenuators, such as resistors, into or out of a signal path, such as of a test instrument. The MEMS switches can be fabricated on the same substrate as the attenuators, or the switches or attenuators can be mounted on the same substrate as the others are fabricated. An instrument probe includes attenuators and MEMS switches that are controlled by the instrument and/or by a control circuit in the probe. Optionally, the probe includes reactive elements, such as capacitors, and MEMS switches to compensate for electrical characteristics of the probe and/or probe lead, and the probe or a test instrument automatically sets the MEMS switches to connect appropriate ones of the reactive elements to a signal path within the probe.

Abstract: Versatile control pin electronics are disclosed. The control pin electronics are coupled to a control pin and allow for the passing of both analog and digital control signals. The control pin electronics work with digital logic having logic levels that are compatible with analog signals having predefined voltage and current limits. The versatile control pin electronics include both a voltage regulator that sets a regulated voltage at the control pin and a current limiter. The versatile control pin electronics can be coupled to a comparator to provide both hysteresis and latching functionality from a single pin.