Abstract: A method of preparing a glucosylated steviol glycoside composition involving by treating stevia materials with cyclodextrin glycosyltransferase.

Abstract: The present document discloses a device for improving receiving and transmitting performance of radio frequency link, comprising a radio frequency transmitting link, a radio frequency receiving link and a test link, wherein a first node is set between a power amplifier and a contact spring of first antenna in the radio frequency transmitting link, the first node is connected to a first on-off port of a radio frequency main switch in the test link; a second node is set between a receiving filter and a contact spring of second antenna in the radio frequency receiving link, the second node is connected to a third on-off port of the radio frequency main switch in the test link; and a second on-off port of the radio frequency main switch in the test link is connected to ground via a resistor.

Abstract: A USB interface power supply method and power supply device for a time division multiple access load system reduce costs of using the capacitance while guaranteeing the performance. The USB interface power supply device includes: a USB interface, a soft-start circuit and a DC-DC direct current conversion circuit that are connected in sequence, wherein, an output of the DC-DC direct current conversion circuit supplies power to the time division multiple access load system. The power supply device also includes a capacitor, wherein: a first end of the capacitor is connected between the soft-start circuit and the DC-DC direct current conversion circuit, a second end of the capacitor is set to be grounded, and the capacitor is used for limiting an input current of the DC-DC direct current conversion circuit.

Abstract: The present document discloses a device for improving receiving and transmitting performance of radio frequency link, comprising a radio frequency transmitting link, a radio frequency receiving link and a test link, wherein a first node is set between a power amplifier and a contact spring of first antenna in the radio frequency transmitting link, the first node is connected to a first on-off port of a radio frequency main switch in the test link; a second node is set between a receiving filter and a contact spring of second antenna in the radio frequency receiving link, the second node is connected to a third on-off port of the radio frequency main switch in the test link; and a second on-off port of the radio frequency main switch in the test link is connected to ground via a resistor.

Abstract: A USB interface power supply method and power supply device for a time division multiple access load system reduce costs of using the capacitance while guaranteeing the performance. The USB interface power supply device includes: a USB interface, a soft-start circuit and a DC-DC direct current conversion circuit that are connected in sequence, wherein, an output of the DC-DC direct current conversion circuit supplies power to the time division multiple access load system.

Abstract: An apparatus for dynamically adjusting a power amplifier of a mobile terminal is provided by the present invention, the apparatus includes: a controlling unit, adapted to receive a dynamically varying control signal from a base band chip and control a voltage adjusting unit according to the control signal; the voltage adjusting unit, adapted to dynamically adjust a power supply voltage and a bias voltage of a radio frequency, RF, power amplifying unit under the control of the controlling unit in the case of the mobile terminal being in a transmitting state; and the RF power amplifying unit, adapted to work under the power supply voltage and the bias voltage and to amplify the power of modulated OFDM signal With the present invention, the following problems and disadvantages of the linear power amplifier are overcome: due to the fixed bias and power supply voltage, the efficiency is low and the power consumption is high in the case of a medium or small power output and the linearity does not satisfy the requir