Abstract: Methods, devices, and systems for charging a battery in a mobile device are provided. For example, in one embodiment, among others, a battery charging system includes a monitoring circuit configured to monitor a battery and generate a sense current. The battery charging system further includes a comparing circuit configured to compare a reference current and the generated sense current. The comparing circuit is further configured to generate a comparison signal. Also, the battery charging system further includes a control circuit configured to control a level of a charging current applied to the battery based on the comparison signal.

Abstract: A system and method for dual mode DP and HDMI transmission are provided. Briefly described, one embodiment of a dual mode DP and HDMI transmitter, among others, can be implemented as follows. The dual mode DP and HDMI transmitter comprises a driver circuit controlled by a data signal. The dual mode DP and HDMI transmitter also comprises a control circuit coupled to the driver circuit. The control circuit is configurable to transmit the data signal in a DP mode or a HDMI mode according to a mode signal. One embodiment of a method, among others, comprises: receiving a mode signal; determining whether to configure the dual mode DP and HDMI transmitter for transmitting in a DP mode or an HDMI mode based on the received mode signal; and configuring a dual mode DP and HDMI transmitter in accordance with the determination.

Abstract: A portion of a differential charge pump circuit is partially replicated and is utilized as a replica circuit to define the common-mode voltage VCM of the differential output voltages of the charge pump circuit that drives a voltage controlled oscillator (VCO) in a PLL system application, or a voltage-controlled delay (VCD) circuit in a DLL system application. The replica circuit includes a high gain operational amplifier and at least three MOS transistors electrically coupled to the differential charge pump circuit. The operational amplifier generates the DC output voltage VO which is used to define the common-mode voltage VCM of the charge pump circuit. The three transistors are configured in replica of one-half of the charge pump circuit. The operational amplifier is provided with a bias voltage at the inverting-end input terminal.