Abstract:
One example discloses a class-D amplifier apparatus, comprising: an amplifier circuit, having a set of input terminals, a set of output terminals, a quiescent circuit configuration, and an active circuit configuration; an amplifier control device, coupled to the amplifier circuit; wherein the amplifier control device is configured to place the amplifier circuit in the quiescent circuit configuration before measuring a voltage between the set of output terminals; wherein the amplifier control device is configured to add the output terminals voltage from the set of input terminals before placing the amplifier circuit in the active circuit configuration.
Abstract:
At least one tone is generated. An output signal is generated in response to an input signal and the at least one tone. The output signal is modulated. The input signal and the at least one tone are represented in the modulated output signal. The at least one tone is outside a bandwidth of the input signal as represented in the modulated output signal. The modulated output signal is amplified. The at least one tone in the amplified signal is attenuated after the amplifying.
Abstract:
The invention concerns a method for pulse pattern generation, wherein an input signal is duplicated into a first and a second input signal part, a delta sigma modulation of the first input signal part is performed resulting in a first modulated input signal part, a first pulse pattern part is generated from the first modulated input signal part, the second input signal part is multiplied with a factor resulting in a multiplied second input signal part, a delta sigma modulation of the multiplied second input signal part is performed resulting in a second modulated input signal part, a multiplied second pulse pattern part is generated from the second modulated input signal part by multiplication with the inverted factor, and the first pulse pattern part and the multiplied second pulse pattern part are added, and a transmitter therefor.
Abstract:
Power efficiency is an important design requirement of power amplifiers. To improve power efficiency, a solution proposed in this present disclosure includes an all-digital zero-voltage switching apparatus for directly driving a switching power amplifier through a desired current pulse shape. The apparatus includes a digital engine and a digital-to-analog converter (DAC). The digital engine processes baseband data and generates a digital output. The digital output of the digital engine drives the DAC to generate a digitally controlled current output having that desired current pulse shape. The digitally controlled current output is used to directly drive the switch power amplifier (704) to improve power efficiency. The digitally controlled current output comprising digitally generated current pulses is controlled accurately by the digital engine and the DAC, and thus allows the switching power amplifier (204) to operate optimally with higher power efficiency than conventional power amplifiers.
Abstract:
An amplifier arrangement for amplifying a radio signal comprising at least a first amplifier module and a second amplifier module is presented wherein a splitter stage for dividing an amplifier stage input signal into several signal portions. The signal portions are amplified in the at least two parallel amplifier modules. A combiner stage combines the separate amplifier output signals into a single amplifier arrangement output signal.
Abstract:
The invention concerns a power amplifier chain (302, 306, 308, 310) aimed to feed a power amplifier (312) with a digital signal (303) generated by sigma-delta modulation means (102) associated with control means (314) based on a model of the power amplifier (312) in order to determine a control signal (307) controlling said sigma-delta modulation means and compensate a quantification treatment of said digital signal (303) by a quantizer (306), characterized in that it comprises control means (314) to operate a feedback loop on the sigma-delta modulation means (312) based on the signal (303) transmitted by the sigma-delta modulations means.