Abstract: An apparatus includes a first circuit that has a photodetector. The photodetector is reverse-biased by a reverse-bias voltage. A common mode voltage is added to the reverse-bias voltage to provide an offset to the photodetector voltage. A second circuit is coupled to the first circuit to provide the common mode voltage for the first circuit. A third circuit is coupled to the second circuit that includes a first voltage source and a second voltage source having opposite voltages equal to half of the reverse-bias voltage. Each one of the first voltage source and the second voltage source are coupled between separate input and output nodes of input and output ports of the third circuit. The first voltage source and the second voltage source provide the reverse-bias voltage to the first circuit to reverse-bias the photodetector. The third circuit provides a photodetector current at an output of the third circuit.

Abstract: An apparatus for detecting optical signals includes a photodetector. The photodetector is reverse-biased by a first voltage and a second voltage is added to the first voltage to provide an offset equal to the second voltage for the photodetector. A first circuit is coupled to the first circuit to provide the second voltage for the photodetector and a second circuit is coupled to the first circuit to provide the first voltage to the photodetector to reverse-bias the photodetector. The second circuit provides an output voltage proportional to a current of the photodetector at an output of the second circuit.

Abstract: An apparatus for detecting optical signals includes a photodetector. The photodetector is reverse-biased by a first voltage and a second voltage is added to the first voltage to provide an offset equal to the second voltage for the photodetector. A first circuit is coupled to the first circuit to provide the second voltage for the photodetector and a second circuit is coupled to the first circuit to provide the first voltage to the photodetector to reverse-bias the photodetector. The second circuit provides an output voltage proportional to a current of the photodetector at an output of the second circuit.

Abstract: A device includes a first circuit, a ground, a reference voltage source that provides a reference voltage, and a first transistor that includes a first drain, a first source, and a first gate. The first circuit is coupled between the first source and the ground. The device has a second transistor that includes a second source and a second gate. The second transistor is biased as a source follower with the second source of the second transistor being set at the reference voltage. The first gate of the first transistor is coupled to the second gate of the second transistor, the first source has equal voltage as the second source, and the first circuit is coupled between the first source having the reference voltage and the ground to draw a constant current from the first source and to bias the first transistor in the saturation region to reduce parasitic capacitance.

Abstract: An apparatus includes a digital ramp generator comprising a delay line, the delay line comprising one or more delay elements and an oscillator, wherein the digital ramp generator is configured to generate a code based on respective outputs of the one or more delay elements, a digital to analog converter coupled to the digital ramp generator, wherein the digital to analog converter is configured to generate a reference signal, wherein the reference signal is generated based, at least in part, on the code, and a driver coupled to the digital to analog converter, the driver configured to generate a drive current based, at least in part, on the reference signal.

Abstract: An envelope tracking device includes circuitry that senses a current of an input state of the envelope tracking device. The circuitry also senses an output voltage of the envelope tracking device, and turns on at least one of a first and a second output switches to generate an output current based on at least one of the sensed current and the sensed voltage.

Abstract: A device, a circuit, and a method for current bypass are provided. The device includes circuitry detects an overload condition at a switching regulator output, enables a current bypass path including a linear current source in response to detecting the overload condition, and digitizes a difference between a load current and a switching regulator output current. The linear current source generates an active current assist signal based on the digitized difference between the load current and the switching regulator output current.

Abstract: A device, a circuit, and a method for current bypass are provided. The device includes circuitry detects an overload condition at a switching regulator output, enables a current bypass path including a linear current source in response to detecting the overload condition, and digitizes a difference between a load current and a switching regulator output current. The linear current source generates an active current assist signal based on the digitized difference between the load current and the switching regulator output current.

Abstract: An envelope tracking device includes circuitry that senses a current of an input state of the envelope tracking device. The circuitry also senses an output voltage of the envelope tracking device, and turns on at least one of a first and a second output switches to generate an output current based on at least one of the sensed current and the sensed voltage.

Abstract: Described are methods and apparatuses, including computer program products, for automatically updating a tag embedded in a webpage that summarizes a current version of the webpage. A first model representative of the current version of the webpage is extracted. The first model is compared with a second model corresponding to a previous version of the webpage to detect one or more changes to the webpage. If the changes exceed a threshold, at least one keyword is determined for to the current version of the webpage. The tag of the webpage can be updated to include the keyword.