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Signal processing circuit and method

A signal processing circuit and signal processing technology, applied to electrical components, automatic power control, transmission systems, etc., can solve problems such as degradation

Inactive Publication Date: 2016-06-15
MEDIATEK INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the second harmonic of the upconverted signal may affect the VCO signal through the magnetic coupling between the transformer (e.g., balanced-to-unbalanced (balun) transformer) in the transmitter system and the inductor of the VCO
Due to this pulling effect, the VCO signal may not be the desired perfect sine wave and may cause Error Vector Magnitude (EVM) degradation

Method used

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  • Signal processing circuit and method
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Embodiment Construction

[0014] Certain terms are used in the specification and following claims to refer to particular elements. Those skilled in the art should understand that manufacturers may use different terms to refer to the same element. This description and the following claims do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for the difference. The "comprising" mentioned throughout the specification and the following claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described herein that a first device is electrically connected to a second device, it means that the first device may be directly connected to the second device, or indirectly connected to the second device through other devices or connection means.

[0015] To protect the clock s...

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Abstract

The invention provides a signal processing circuit and method. The signal processing circuit has a first mixer, a first amplifier, and a pulling effect mitigation circuit. The first mixer mixes a first input signal and a first oscillation signal to generate a first output signal, wherein the first oscillation signal is generated by dividing a frequency of a reference clock with a frequency dividing factor. The first amplifier is coupled to the first mixer, amplifies the first output signal, and generates an amplified output signal at an output terminal of the first amplifier. The pulling effect mitigation circuit is coupled to the output terminal of the first amplifier, and generates a compensation signal to the output terminal for reducing at least an Nth harmonic of the amplified output signal, wherein a value of N is equal to the frequency dividing factor. By means of the signal processing circuit and method, the unexpected harmonic wave of the amplified output signals is reduced so that the pulling effect is mitigated.

Description

technical field [0001] The present invention relates to signal processing circuits and, more particularly, to signal processing circuits and related methods for mitigating pulling effects. Background technique [0002] In a traditional transmitter system, a baseband signal (data signal to be transmitted) needs to be up-converted by a local oscillator (LO) signal to generate an up-converted signal, such as a radio frequency (RF) signal. When the frequency F of the voltage controlled oscillator (VCO) signal is VCO Divide by the frequency division factor 2 to obtain the frequency F of the LO signal LO (i.e., F LO =F VCO / 2), the frequency of the second harmonic of the up-conversion signal will be twice the fundamental frequency of the up-conversion signal, and close to the frequency F of the VCO signal VCO . Therefore, the second harmonic of the upconverted signal may affect the VCO signal through the magnetic coupling between the transformer (e.g., balanced-to-unbalanced ...

Claims

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Application Information

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IPC IPC(8): H03L7/18H03L7/099H04B1/04
CPCH03K5/00006H03D7/00H03D2200/009
Inventor 孙志豪
Owner MEDIATEK INC