Abstract: A level shifter circuit for shifting a voltage level of a logic signal from a first voltage to a second voltage includes an input stage operating in a domain of a first voltage supply that receives an input signal. The input stage includes a first inverter receiving the input signal and providing a first inverted signal. An output voltage level shifting stage operating in a domain of a second voltage supply is coupled to the input stage and providing an output signal having a voltage level corresponding to the second voltage supply domain and a logic value corresponding to the input signal. The level shifter circuit enables voltage level shifting a logic signal from a high to a low operating voltage, or from a low to a high operating voltage. The level shifter circuit enables high frequency operation, providing both fast switching and low capacitance.

Abstract: Simplifying the design of buffer amplifier circuits to provide reference voltages of desired characteristics on a path. Two separate circuits may be used to provide the necessary charging (of a load connected to the path) in non-overlapping time durations. In an embodiment in which the load comprises sampling capacitors of a stage of an analog to digital converter (ADC), each of the two circuits contains a corresponding charging capacitor, with the charging capacitors charging the load in non-overlapping time durations of a hold phase. The first charging capacitor may be charged using a coarse buffer with a high drive strength and the second charging capacitor may be charged using a fine buffer with high accuracy.

Abstract: The invention relates to a ear transceiver comprising: an ear hanger, a transceiver mounted on another end of front stand of an ear hanger, and an electrical connecting means connected to the transceiver; the ear hanger is provided with: a front stand, a rear stand and a supporting tube connected to the front stand and rear stand, another end of the front stand connected to a microphone supporting rod, both ends of the microphone are connected to a microphone and an earphone respectively, the front stand has a plurality of supporting rods, a pair connecting is means in provided between various supporting rods and between the microphone supporting rod and end of the front stand, and the connecting part of the microphone supporting rod and earphone has plug-in pieces of electric connection. The ear hanger adapts to various sizes of human ears, both left and right ears can wear a same hanger, and the distance and height between a microphone and a mouth being adjustable and convenient in replacement.