Antenna impedance matching device, semi-conductor chip and antenna impedance matching method

Abstract

The present invention provides an antenna impedance matching apparatus (100), semiconductor chip (110), and method. The apparatus includes: a semiconductor chip (110), including multiple adjustable capacitors (111) and multiple switches (112); and at least one impedance component (120), located outside the semiconductor chip, where the semiconductor chip is coupled to the at least one impedance component through multiple terminals and coupled to an input terminal and an output terminal of the antenna impedance matching apparatus, the input terminal and the output terminal of the antenna impedance matching apparatus are respectively coupled to a radio frequency circuit (130) and an antenna (140), the multiple switches are configured to, under control of a control signal, switch a connection between the multiple adjustable capacitors and the at least one impedance component, and values of the multiple adjustable capacitors are adjusted by an adjustment signal, so as to tune impedance matching of the antenna. The apparatus is a reconfigurable impedance matching network, that flexibly realizes different circuit topologies, like L, T, Pi,... topologies, depending on the impedance component and position of the switches.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an antenna impedance matching device, a semiconductor chip and a method. Background technique [0002] The antenna impedance of the user equipment is easily affected by the external environment. For example, common actions such as the user holding the user equipment, or putting the user equipment close to the head, or putting the user equipment in a pocket may cause significant changes in the antenna impedance. For the RF transceiver system, the impedance mismatch at the antenna port will deteriorate the communication performance. For example, the efficiency of the power amplifier will be reduced, resulting in a decrease in transmit power, an increase in power consumption of the whole machine, and deterioration of the noise figure of the receiver, resulting in a decrease in sensitivity. In addition, with the deployment of the LTE system, the frequency range that the user eq...

AI Technical Summary

Problems solved by technology

However, such an impedance matching network structure is still fixed, and for different user equipment, it is necessary to redesign and debug the external components of the antenna tuner semiconductor chip according to the characteristics of the antenna, so that the development cycle is prolonged

Moreover, the structure of the fixed impedance matching network makes the frequency tuning range limited

If you want to cover the broadband frequency range, you must replace the fixed capacitor / inductance device outside the semiconductor chip, so such an antenna tuner cannot meet the requirements of the full-band broadband system

[0007] In addition, the adjustable capacitance semiconductor chip and the external capacitance / inductance device can be packaged into one device, thereby reducing the area of ​​the PCB and reducing the cost. However, since the topology of the impedance matching network and the inductance value of the inductance device are fixed, so , such a device can only be used for a specific mobile phone platform or frequency band, and cannot be used as a general-purpose device, and can only cover a narrow-band frequency range, which cannot meet the requirements of a full-band broadband system

[0008] Since the fixed topology network must be debugged and optimized according to the characteristics of the antenna in order to obtain the best performance, and the inductance value of the off-chip inductor or capacitor element is fixed and not adjustable, the frequency range of the above impedance matching network cannot meet the full-band broadband system requirements

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