Abstract: A switching amplifier includes an input end for receiving an input signal, a reference signal reception end for receiving a reference signal, a feedback end for receiving a feedback signal, an output end for outputting an output signal, an integration circuit for performing integration operation on the input signal according to the output signal and the feedback signal, so as to generate an integration result, a comparison circuit coupled to the integration circuit, the reference signal end, and the output end, for comparing the integration result and the reference signal, so as to generate the output signal for the output end, and a feedback circuit coupled between an output end of the integration circuit and the feedback end, for generating the feedback signal for the feedback end to clamp the integration result to a predetermined value when the integration result reaches the predetermined value.

Abstract: In a control circuit and method for a high efficiency and low EMI switching amplifier, an input signal is compared with a reference signal to generate a comparison signal, and a control signal is generated in response to the comparison signal for a driver to generate an output signal. The output signal is fed back to control the slope of the reference signal in association with an initial level set for the reference signal to provide a minimum on-time period for the output signal. Alternatively, a reference value is provided to compare with the reference signal for setting a minimum on-time period for the output signal.

Abstract: In a switching amplifier for generating a pair of output signals of square waves in response to an input signal, when the input signal is zero, the first output signal has a first duty cycle and the second output signal has a second duty cycle; when the input signal is greater than zero, the first output signal has a third duty cycle varying with the input signal and the second output signal still has the second duty cycle; and when the input signal is less than zero, the first output signal has the first duty cycle and the second output signal has a fourth duty cycle varying with the input signal. The first and second duty cycles are very small but equal to each other in size, and the phase difference between the first and second output signals could range from 0 to 180 degrees.

Abstract: In a control circuit and method for a high efficiency and low EMI switching amplifier, an input signal is compared with a reference signal to generate a comparison signal, and a control signal is generated in response to the comparison signal for a driver to generate an output signal. The output signal is fed back to control the slope of the reference signal in association with an initial level set for the reference signal to provide a minimum on-time period for the output signal. Alternatively, a reference value is provided to compare with the reference signal for setting a minimum on-time period for the output signal.

Abstract: In a control circuit and method for a high efficiency and low EMI switching amplifier, an input signal is compared with a reference signal to generate a comparison signal, and a control signal is generated in response to the comparison signal for a driver to generate an output signal. The output signal is fed back to control the slope of the reference signal in association with an initial level set for the reference signal to provide a minimum on-time period for the output signal. Alternatively, a reference value is provided to compare with the reference signal for setting a minimum on-time period for the output signal.

Abstract: A power supply device for driving an amplifier includes a first power generator, a second power generator, a charge pump and a control unit. The first power generator is used for providing a first voltage for a first power reception end of the amplifier. The second power generator is used for providing a second voltage. The charge pump is coupled between the second power generator and a second power reception end of the amplifier and is used for generating a third voltage for the amplifier according to the second voltage. The control unit is coupled to the second power generator and is used for controlling the second power generator, so as to adjust the second voltage to make the third voltage equal to a multiple of the first voltage.

Abstract: The present invention discloses a method for reducing switching interference in a switching amplifier. The switching amplifier includes a first half circuit having a first modulator and a first driver circuit, a second half circuit having a second modulator and a second driver circuit, a first reference wave generator for a first reference wave, and a second reference wave generator for a second reference wave. A first input signal and a second input signal are inputted to the first modulator and the second modulator, respectively. A first modulated signal and a second modulated signal are generated and inputted to the first driver circuit and second driver circuit, respectively. There is a time delay between the switching points, wherein the time delay is large enough to avoid mutual interference. Therefore, distortion of the output signal can be eliminated while the input signals are small.

Abstract: An amplifier circuit includes a feedback loop; a former stage amplifier unit coupled to an input node of the amplifier circuit and the feedback loop for amplifying the difference between an input signal received from the input node and an output signal which comes back through the feedback loop, and outputting a first output signal; a compensating amplifier unit coupled to the former stage amplifier unit for amplifying the first output signal and outputting a second output signal; and an output stage amplifier unit coupled to the compensating amplifier unit and the feedback loop for outputting a third output signal according to the second output signal.

Abstract: A power supply device for driving an amplifier includes a first power generator, a second power generator, a charge pump and a control unit. The first power generator is used for providing a first voltage for a first power reception end of the amplifier. The second power generator is used for providing a second voltage. The charge pump is coupled between the second power generator and a second power reception end of the amplifier and is used for generating a third voltage for the amplifier according to the second voltage. The control unit is coupled to the second power generator and is used for controlling the second power generator, so as to adjust the second voltage to make the third voltage equal to a multiple of the first voltage.

Abstract: In an amplifier circuit with reduced power-off transients, an amplifier is provided for receiving an input signal and a reference signal to generate an output signal therefrom when it is enabled, and the amplifier is disabled when the supply voltage to the amplifier drops down to a threshold or to a level higher than the reference signal a threshold. The output stage transistor of the amplifier is applied with a body voltage to suppress the body diode parasitic to the output stage transistor to be forward-biased.

Abstract: In an amplifier circuit with reduced power-on transients, an amplifier has a gain to generate an output signal from an input signal and a reference signal when it is enabled, and a control circuit generates a control signal, based on the output signal and the reference signal, to be supplied to the amplifier during a power-on event. The amplifier is enabled by the control signal when the reference signal reaches the level of the output signal.

Abstract: An amplifier circuit includes a feedback loop; a former stage amplifier unit coupled to an input node of the amplifier circuit and the feedback loop for amplifying the difference between an input signal received from the input node and an output signal which comes back through the feedback loop, and outputting a first output signal; a compensating amplifier unit coupled to the former stage amplifier unit for amplifying the first output signal and outputting a second output signal; and an output stage amplifier unit coupled to the compensating amplifier unit and the feedback loop for outputting a third output signal according to the second output signal.

Abstract: In a switching amplifier for generating a pair of output signals of square waves in response to an input signal, when the input signal is zero, the first output signal has a first duty cycle and the second output signal has a second duty cycle; when the input signal is greater than zero, the first output signal has a third duty cycle varying with the input signal and the second output signal still has the second duty cycle; and when the input signal is less than zero, the first output signal has the first duty cycle and the second output signal has a fourth duty cycle varying with the input signal. The first and second duty cycles are very small but equal to each other in size, and the phase difference between the first and second output signals could range from 0 to 180 degrees.

Abstract: In a control circuit and method for a high efficiency and low EMI switching amplifier, an input signal is compared with a reference signal to generate a comparison signal, and a control signal is generated in response to the comparison signal for a driver to generate an output signal. The output signal is fed back to control the slope of the reference signal in association with an initial level set for the reference signal to provide a minimum on-time period for the output signal. Alternatively, a reference value is provided to compare with the reference signal for setting a minimum on-time period for the output signal.

Abstract: In an amplifier circuit with reduced power-off transients, an amplifier is provided for receiving an input signal and a reference signal to generate an output signal therefrom when it is enabled, and the amplifier is disabled when the supply voltage to the amplifier drops down to a threshold or to a level higher than the reference signal a threshold. The output stage transistor of the amplifier is applied with a body voltage to suppress the body diode parasitic to the output stage transistor to be forward-biased.

Abstract: In an amplifier circuit with reduced power-on transients, an amplifier has a gain to generate an output signal from an input signal and a reference signal when it is enabled, and a control circuit generates a control signal, based on the output signal and the reference signal, to be supplied to the amplifier during a power-on event. The amplifier is enabled by the control signal when the reference signal reaches the level of the output signal.

Abstract: A method of forming and operating a trench split-gate non-volatile flash memory cell structure. The auxiliary gate of the structure is formed inside a trench on one side of the gate and the source terminal is underneath the auxiliary gate, thereby reducing overall area occupation of the auxiliary gate and the source terminal relative to the cell and increasing packing density. By enclosing the common source terminal inside a deep N-well layer, source resistance for reading data from the cell is reduced and the process of etching out a contact opening is simplified. The structure also ensures the injection of most hot electrons into the floating gate, thereby increasing execution speed.

Abstract: A method of forming and operating a trench split-gate non-volatile flash memory cell structure. The auxiliary gate of the structure is formed inside a trench on one side of the gate and the source terminal is underneath the auxiliary gate, thereby reducing overall area occupation of the auxiliary gate and the source terminal relative to the cell and increasing packing density. By enclosing the common source terminal inside a deep N-well layer, source resistance for reading data from the cell is reduced and the process of etching out a contact opening is simplified. The structure also ensures the injection of most hot electrons into the floating gate, thereby increasing execution speed.

Abstract: A method for manufacturing a flash device having a trench source line comprises providing a semiconductor substrate. A pad oxide is formed on a substrate, then forming a nitride layer on the pad oxide. The nitride layer and the pad oxide layer are patterned then etching the substrate to form a trench in the substrate. An ion implantation is performed to dope ions into the substrate under the trench to form the trench source line. Next, refilling material is refilled into the trench, followed by performing chemical mechanical polishing to remove a portion of the refilling material to the substrate. A gate dielectric layer, a first doped conductive layer, an inter conductive dielectric layer, a second conductive layer are formed. The first conductive layer, the second conductive layer and the inter conductive dielectric layer are etched to form gate structure. Subsequently, source and drain regions are formed by ion implantation and halo-doped region is formed under the drain regions by ion implantation.

Abstract: A method of forming and operating a trench split-gate non-volatile flash memory cell structure. The auxiliary gate of the structure is formed inside a trench on one side of the gate and the source terminal is underneath the auxiliary gate, thereby reducing overall area occupation of the auxiliary gate and the source terminal relative to the cell and increasing packing density. By enclosing the common source terminal inside a deep N-well layer, source resistance for reading data from the cell is reduced and the process of etching out a contact opening is simplified. The structure also ensures the injection of most hot electrons into the floating gate, thereby increasing execution speed.