Amplifier apparatus, polar modulation transmission apparatus and wireless communication apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorTaichi Ikedo
Life of this patent
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Abstract
A quantizer 122, and a plurality of down-samplers 124-1 to 124-N down-sampling the quantized output at a speed of (1/N) of the sampling rate of the quantizer 122 and shifting the respective phases by (360/N) degrees so as to provide a latched output, are provided. As a result, it is possible to carry out the same operation as for a polyphase quantizer using the down-samplers 124-1 to 124-N with a small circuit scale, while avoiding the variations in characteristics that occur as a result of using a polyphase quantizer.
Claims8
An amplifier apparatus, having a non-linear high-frequency power amplifier amplifying a first input signal and a power supply voltage control section receiving as input an external power supply forming a power supply voltage for the high-frequency amplifier based on a second input signal, amplifying the signal level of the first input signal using the high-frequency power amplifier to a level corresponding to the second input signal,
- the power supply voltage control section having a delta modulator configuration or a delta-sigma modulator configuration and comprising:
- a quantizer quantizing a signal according to a signal level of the second input signal;
- a plurality of down-samplers down-sampling quantized outputs obtained from the quantizer at a lower speed than a sampling rate of the quantizer and with respective phases shifted;
- and
- a combiner combining outputs of the plurality of down-samplers.
Dependencies are inferred from the claim text.