Integrated circuit, wireless communication unit and related methods
An integrated circuit and signal technology, applied in the field of differential to single-ended conversion, can solve the problems of input AC envelope signal asymmetry, modulator circuit 300 is not ideal, increase circuit complexity, etc., and achieve the effect of improving signal characteristics
Active Publication Date: 2013-04-24
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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[0010] However, this modulator circuit 300 is not ideal because its envelope corresponding to the input signal is completely positive
Thus, the potential net value will be increased due to the difficulty of implementing differential input signals (i.e. positive and negative parts of the signal), and even additional circuit techniques to minimize DC offset and / or reduce noise
Another disadvantage of the modulator circuit 300 is that the input AC envelope signal is asymmetrical around the mean value
Therefore, it is necessary to use more complex techniques, such as de-troughing (or other signal mapping techniques) to increase the asymmetry of the modulated signal, thereby further increasing the complexity of the circuit
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[0023] The embodiment of the present invention describes an integrated circuit used in a wireless communication unit, such as a user equipment in the 3rd generation partnership project (3rd generation partnership project, 3GPPTM) communication standard. However, those skilled in the art should understand that the inventive concepts described herein are not limited to any type of integrated circuit wireless communication unit or wireless transmitter that can benefit from improved linearity and improved efficiency by using a differential circuit. In some embodiments of the present invention, a circuit design for connecting an envelope tracking amplifier (supply modulator) to the envelope extraction path (envelope extraction and DAC) is also described. The circuit design compensates for the absolute positive nature of the envelope modulated signal produced by the envelope extraction path. An embodiment of the circuit design described above can remove a fixed DC component from a p...
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The present invention provides an integrated circuit, a wireless communication unit and related methods. The integrated circuit is used for providing a differential interface suitable for enveloping a tracking signal and comprises subtraction module of a first input for receiving a digital envelope tracking signal and a second input for receiving a second signal, the subtraction module being used for subtracting the second signal from the digital envelope tracking signal so as to generate an envelope tracking signal having a reduced average DC component; a digital to analog converter for receiving the envelope tracking signal to generate a differential analog format signal; and modulator optionally coupled to the digital to analog converter for differential output, the modulator comprising a DC input point for inserting the DC component to the differential analog format signal. Embodiments of the invention can remove the DC component from the digital envelope tracking signal and then introduce / add an analog DC signal to the envelope tracking signal with the DC component removed so as to improve the signal characteristics.
Description
【Technical field】 [0001] The field of the invention is a wireless communication unit, an integrated circuit, a transmitter structure and a method for providing differential to single-ended conversion of a signal. The present invention is applicable, but not limited, to envelope tracking using differential circuit configurations and related methods. 【Background technique】 [0002] The present invention is mainly applied in the field of radio frequency (radio frequency, RF) power amplifier of wireless telecommunication. The constant pressure from the limited spectrum available in wireless communication systems has forced the continuous development of spectrally-effect linear modulation schemes. Due to the fluctuating envelope in these linear modulation schemes, this phenomenon causes the average power transmitted by the antenna to be much lower than its maximum power, potentially making the power amplifier less efficient. A great deal of research has therefore been devoted i...
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IPC IPC(8): H04B1/04
Inventor 乔纳森·理查·思创保罗·福罗斯
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE