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Polar modulation apparatus and method with common-mode control

A technology of polar modulation and equipment, applied in the direction of modulation, simultaneous amplitude and angle modulation, electrical components, etc., can solve problems such as power efficiency decline, and achieve the effect of improving linearity and enhancing power control

Inactive Publication Date: 2011-10-12
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in a loss of power efficiency

Method used

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  • Polar modulation apparatus and method with common-mode control
  • Polar modulation apparatus and method with common-mode control
  • Polar modulation apparatus and method with common-mode control

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Embodiment Construction

[0030] Embodiments will now be described in connection with a polar modulator device that uses IQ modulation.

[0031] figure 1A schematic block diagram showing the concept of a differential polar modulator with separate paths for the amplitude modulation component AM and the phase modulation component PM according to the first preferred embodiment. The phase modulation component PM is amplified by first and second amplification or gain stages 10 , 12 and applied to a push-pull output driver 20 . In the push-pull output driver 20 , an amplitude modulation component AM is applied as a common-mode signal that modulates the common-mode current of the differential PA 30 . The two gain stages 10, 12 may be current amplifiers with unity voltage gain. Therefore, the power gain of the gain stages 10, 12 is equal to the current gain and can be controlled digitally. Controlling the gains of the two gain stages 10, 12 directly affects the power gain and thus the output power of the ...

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Abstract

The present invention relates to a polar modulation apparatus and method, in which a polar-modulated signal is generated based on separately processed phase modulation (PM) and amplitude modulation (AM) components of an input signal. An amplified polar modulated output signal is generated in accordance with the phase modulation and amplitude modulation components by using a differential power amplifier circuitry(30) and supplying an amplified phase modulation component to a differential input of the differential power amplifier circuitry(30). A bias input of the differential power amplifier circuitry(30) is controlled based on the amplitude modulation component, so as to modulate a common-mode current of the differential power amplifier circuitry(30). Thereby, a new concept of a polar modulator with static DC-DC converter and power and / or efficiency and / or linearity controlled output power amplifier can be achieved.

Description

technical field [0001] The invention relates to a polar modulation device in which the phase modulation and amplitude modulation components of an input signal are processed in separate paths. Background technique [0002] In current power amplifier (PA) designs, linearity and power efficiency are very important requirements. There are multiple parameters that affect linearity and efficiency requirements, such as compression point, output power, deliverable gain or accuracy, which can be represented by the error vector magnitude (EVM). It is almost impossible to optimize all design parameters simultaneously. For example, efficiency and linearity are two conflicting requirements. In principle, a linear increase at high power levels leads to a decrease in power efficiency, while on the other hand, an increase in efficiency at low power levels results in a linear deterioration. [0003] The above-mentioned problems become more and more severe for wireless communication system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03C5/00
CPCH03C5/00
Inventor 米哈伊·A·T·桑托利努拉姆·P·安迪特哈姆爱德华·F·斯蒂克沃罗特
Owner NXP BV