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Signal modulator and signal modulating method

A signal modulation and signal technology, applied in modulated carrier systems, phase modulated carrier systems, digital transmission systems, etc., can solve the problem of path mismatching image signals, etc., to achieve the effect of improving quality

Active Publication Date: 2015-07-22
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ideally, the image signal problem can be improved by careful routing of the processing paths so that they have identical lengths and parasitics, however, in practice, inherent layout mismatch issues may still lead to inconsistencies in the path. matches and inevitably produces the image signal

Method used

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  • Signal modulator and signal modulating method
  • Signal modulator and signal modulating method

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Embodiment Construction

[0013] Certain terms are used throughout the description to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. In this specification, the difference in names is not used as a way to distinguish components, but the difference in function of components is used as a criterion for distinguishing. "Includes" mentioned throughout the specification is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" here includes any direct and indirect means of electrical connection. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device. second device, or indirectly electrically connected to the second device through other devices or connection means.

[0014] Please also refer to figure 1 and figu...

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Abstract

A signal modulator includes: a modulating circuit; a first signal trace block arranged to conduct a first in-phase oscillating signal to the modulating circuit, and conduct a first quadrature-phase oscillating signal to the modulating circuit; and a second signal trace block arranged to conduct a second in-phase oscillating signal to the modulating circuit, and conduct a second quadrature-phase oscillating signal to the modulating circuit, and a phase difference of the first in-phase oscillating signal caused by the first signal trace block substantially equals a phase difference of the second quadrature-phase oscillating signal caused by the second signal trace block, a second quadrature-phase oscillating signal to the modulating circuit, and a phase difference of the second in-phase oscillating signal caused by the second signal trace block substantially equals a phase difference of the first quadrature-phase oscillating signal caused by the first signal trace block.

Description

technical field [0001] The present invention relates to a signal modulator and its related modulation method, in particular to an image-free signal modulator and its related modulation method. Background technique [0002] In a wireless communication system, such as a low intermediate frequency (intermediate frequency, IF) transceiver system or an offset phase-lock loop (offset phase-lock loop, OPLL) transceiver system, two oscillating signals with a phase difference of 90 degrees (that is, in-phase oscillating signal and quadrature-phase oscillating signal), the radio frequency (Radio Frequency, RF) received signal can be modulated / down-frequency through the frequency modulator of the receiver (down-convert) to obtain an in-phase input signal and a quadrature input signal, and modulate / up-convert a base-band signal (base-band signal) through the frequency modulator of the transmitter to obtain It is realized by an up-converted in-phase signal and an up-converted quadrature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20
CPCH04L27/361H04L27/2075
Inventor 孙志豪虞继尧
Owner MEDIATEK INC
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