Abstract: A circuit of reducing a pop-up noise in a digital amplifier includes a switch unit and a switch signal generator. The switch unit is coupled in parallel to an output load between an output node of the digital amplifier and a reference node. The switch unit controls a current flowing through the output load by forming a conduction path between the output node and the reference node in response to a switch signal. The switch signal generator generates the switch signal in response to a switch control signal indicating a power-on or a power-off. The pop-up noise is reduced by the conduction path that is formed when the digital amplifier is powered on or off.
October 16, 2007
Date of Patent:
October 9, 2012
Samsung Electronics Co., Ltd.
Soo-Hyoung Lee, Wang-Seup Yeum, Yong-Jin Cho, In-Bock Lee
Abstract: An amplifier circuit includes an amplifier connected between an HF input and HF output and a coupling circuit connected in parallel to the amplifier between the HF input and the HF output. The coupling circuit includes an input bipolar transistor whose collector terminal or emitter terminal is high-frequency coupled to the HF input, and a coupling diode structure which is high-frequency coupled between the base terminal of the input bipolar transistor and the HF output.
Abstract: A method is described for mobile stations to measure the desired processing load to monitor pilot signals of multiple base stations. The amount of processing load available to a mobile station is limited. To reduce costs, manufactures attempt to reduce the amount of processor load in a mobile station. Continually searching for pilot signals and processing the results of pilot signal searches consumes processor load. The mobile station of the present invention indicates the search rate of secondary pilot signals may be changed based on the search rate of a reference pilot signal. The mobile station may also indicate an adjustment may be made to the amount of time spent searching for pilot signals by adjusting a variable length timer based on a determined safe search rate.