Abstract: A system may intermittently illuminate a region, detect light from the intermittently illuminated region to form a detected signal, and process the detected signal with a demodulator. The demodulator may include a capacitor having an input to receive the detected signal, a resistor having an input connected to an output of the capacitor at a connection point, and a switch that connects the connection point to ground during times when the region is not illuminated. An output of the resistor may produce an output signal that is a high-pass filtered version of the detected signal during times when the region is illuminated, and a time-invariant ground signal during times when the region is not illuminated. Such a demodulator may reduce the effects of low-frequency noise sources, such as background light, op-amp offsets related to input bias, photodiode 1/f noise and dark current.

Abstract: A system may intermittently illuminate a region, detect light from the intermittently illuminated region to form a detected signal, and process the detected signal with a demodulator. The demodulator may include a capacitor having an input to receive the detected signal, a resistor having an input connected to an output of the capacitor at a connection point, and a switch that connects the connection point to ground during times when the region is not illuminated. An output of the resistor may produce an output signal that is a high-pass filtered version of the detected signal during times when the region is illuminated, and a time-invariant ground signal during times when the region is not illuminated. Such a demodulator may reduce the effects of low-frequency noise sources, such as background light, op-amp offsets related to input bias, photodiode 1/f noise and dark current.

Abstract: An electronic assembly that includes a substrate having an aperture which extends through the substrate. The electronic assembly further includes a gull wing electronic package that includes leads which are solder mounted to the substrate such that the gull wing electronic package is within the aperture in the substrate, wherein the aperture is concentric with an exterior of the gull wing electronic package.

Abstract: Various systems and methods for implementing zero-power mode are described herein. A battery-powered apparatus includes a non-removable battery for powering processing circuitry of the apparatus, charging pins to connect the apparatus to a charging source, and control circuitry that is separate from the processing circuitry. The control circuitry can perform operations that detect the charging pins are shorted and activate a timer for a predetermined wait interval. The control circuitry can also, upon expiration of the timer, disconnect the battery from powering the processing circuitry to activate a device zero-power mode. Upon detecting the charging pins are no longer shorted, the control circuitry can resume power to the processing circuitry. The non-removable battery is only powering the control circuitry while the battery is disconnected from the processing circuitry.

Abstract: An electronic assembly that includes a substrate having an aperture which extends through the substrate. The electronic assembly further includes a gull wing electronic package that includes leads which are solder mounted to the substrate such that the gull wing electronic package is within the aperture in the substrate, wherein the aperture is concentric with an exterior of the gull wing electronic package.

Abstract: Various systems and methods for implementing zero-power mode are described herein. A battery-powered apparatus includes a non-removable battery for powering processing circuitry of the apparatus, charging pins to connect the apparatus to a charging source, and control circuitry that is separate from the processing circuitry. The control circuitry can perform operations that detect the charging pins are shorted and activate a timer for a predetermined wait interval. The control circuitry can also, upon expiration of the timer, disconnect the battery from powering the processing circuitry to activate a device zero-power mode. Upon detecting the charging pins are no longer shorted, the control circuitry can resume power to the processing circuitry. The non-removable battery is only powering the control circuitry while the battery is disconnected from the processing circuitry.