CN102065258B - Antenna control circuit module of mobile digital television - Google Patents

Abstract

The mobile digital TV antenna control circuit module of the present invention includes a PCB substrate on which an antenna matching circuit unit and a low-noise amplification circuit unit are arranged; the module has at least five PIN bits, which are respectively signal input bits, signal output bits, and voltage Input bits, voltage control bits, and module ground bits. On the PCB substrate, the antenna matching circuit unit is set adjacent to the signal input bit; the low-noise amplifier circuit unit is set between the voltage control bit and the signal output bit, and the module ground is set between the signal input bit and the voltage control bit and the signal between output bits. The circuit control module can be conveniently connected to the PIN bit on the main board of the mobile communication terminal equipment, has small size, excellent performance, is easy to integrate, is convenient for mass production, and can be easily integrated into the main board of mobile communication terminal equipment such as mobile phones.

Description

Mobile digital TV antenna control circuit module

technical field

The invention relates to the technical field of antennas, in particular to a control circuit module of a mobile digital TV antenna.

Background technique

In mobile digital TV systems at home and abroad, the current mainstream systems include CMMB in China, DVB-H/T in Europe, ISDB-T in Japan, DMB in Korea and Media FLO in the United States. In recent years, domestic and foreign mobile digital TV has developed rapidly and is favored by more and more users. Especially in the domestic market, driven by the national triple play policy, the number of CMMB digital mobile TV users has grown rapidly.

In the terminal market, the CMMB terminal camp is growing day by day, but at present, the CMMB antennas of the mobile phone mobile communication terminal equipment of various domestic manufacturers still use the traditional telescopic antenna. Although this telescopic antenna can meet the performance requirements of the terminal equipment, but It is extremely inconvenient for users to use. On the other hand, this external antenna also has great risks in terms of service life and mechanical strength. Therefore, in the field of antennas, fully built-in digital TV antennas will become the mainstream in the future, but ordinary passive built-in digital TV antennas have unsatisfactory performance due to size and space constraints, and cannot replace external rod antennas.

Contents of the invention

The problem to be solved by the present invention is to provide an antenna control circuit module, which can be used to design a completely built-in mobile digital TV antenna in conjunction with a common small antenna to meet the needs of the industry.

In order to solve the above problems, the technical solution adopted by the present invention is: a mobile digital TV antenna control circuit module, including a PCB substrate, an antenna matching circuit unit and a low-noise amplifier circuit unit are arranged on the PCB substrate; the digital TV signal enters the antenna from the receiving antenna The matching circuit unit performs matching adjustment, and then the signal is amplified by the low-noise amplifier circuit unit and then output to the subsequent stage circuit.

Specifically, the control circuit module includes at least five PIN bits, which are signal input bits for receiving signals, signal output bits for outputting amplified signals, voltage input bits for external power supply voltage input, and The voltage control bit and the module ground bit that control the working state and sleep state of the entire module. On the PCB substrate, the antenna matching circuit unit is set adjacent to the signal input bit; the low-noise amplifier circuit unit is set between the voltage control bit and the signal output bit, and the module ground is set between the signal input bit and the voltage control bit and signal output bits.

Preferably, the circuit module further includes an LDO voltage control unit for providing a stable power supply voltage to the low-noise amplifier circuit unit; the LDO voltage control unit is arranged adjacent to the voltage input bit, and is located in parallel with the antenna matching circuit unit Above the low noise amplifier circuit unit. The ground position of the circuit control module includes a first ground position and a second ground position, the first ground position is located between the signal input position and the voltage input position, and the second ground position is located between the voltage control position and the signal output position.

More preferably, a metal shield is provided outside the control circuit module.

Compared with prior art, the beneficial effect of the present invention is:

(1) An antenna matching circuit, an LDO voltage control circuit, and a low-noise amplifier circuit are set in the control circuit module, which can effectively compensate the performance of the passive antenna;

(2) The circuit control module cooperates with a simple small antenna, which can realize the function of a fully built-in digital mobile TV antenna, so that the antenna is convenient for integration and built-in;

(3) The circuit control module has six functional PIN bits, which can be conveniently connected to the PIN bits on the main board of the mobile communication terminal equipment, has small size, excellent performance, is easy to integrate, and is convenient for mass production. In the motherboard of mobile communication terminal equipment such as mobile phones.

Description of drawings

FIG. 1 is a schematic structural diagram of a specific embodiment of the mobile digital TV antenna control circuit module according to the present invention.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be described in further detail below in conjunction with the accompanying drawings:

As shown in Fig. 1, the mobile digital TV antenna control circuit module of the present invention includes a PCB substrate 2 on which an antenna matching circuit unit 3, an LDO voltage control unit 4 and a low noise amplifier circuit unit 5 are arranged.

The PCB substrate 2 is provided with at least five ports for connecting with external signals, that is, the control circuit module includes at least five PIN bits. During specific implementation, in order to ensure good signal transmission and avoid interference, two There are six PIN bits in total. The six PIN bits are signal input bit 6 for receiving signals, signal output bit 9 for outputting amplified signals, voltage input bit 11 for external power supply voltage input, and used to control the working state and sleep state of the entire module. Controlling voltage control bit 8 and two module ground bits 7,9.

When the mobile communication terminal equipment uses the control circuit module, firstly reserve six PIN bits of the same size and function on the corresponding position on the main board, and then weld the module on the reserved position. The ordinary built-in small antenna is designed in the mobile communication terminal equipment, and the signal is sent to the signal input bit 6 of the module through the 50-ohm transmission line, and enters the antenna matching circuit unit 3 through the signal input bit 6 for matching adjustment, and then enters the low noise amplifier circuit The unit 5 amplifies the signal and outputs it through the signal output bit 9, and the output signal passes through a filter and finally enters the TV chip. The LDO voltage control unit 4 in the module is used to provide a stable power supply voltage for the low noise amplifier circuit unit. The voltage input bit 11 receives an external control signal to control the working state of the module. When the input is in a high level state, the module works, and when the input is in a low level state, the module stops working, so that when the module does not need to be in the The purpose of saving electricity when working.

On the PCB substrate, the antenna matching circuit unit is set adjacent to the signal input position 6; the low-noise amplifier circuit unit is set between the voltage control position 8 and the signal output position 9, and the module ground is set at the signal input position 6 Between voltage control bit 8 and signal output bit 9. The LDO voltage control unit is arranged adjacent to the voltage input position 11, and is located above the low noise amplifier circuit unit in parallel with the antenna matching circuit unit. Two ground positions are set in the circuit control module, respectively the first ground position 7 and the second ground position 10, the first ground position 7 is located between the signal input position 6 and the voltage input position 11, and the second ground position 10 Set between voltage control bit 8 and signal output bit 9.

The above structural layout can realize the functions of each part of the module in the smallest space while ensuring good and effective transmission of signals, reducing signal loss, and avoiding interference as much as possible.

In addition, considering the problem of EMI, a metal shield is provided outside the control circuit module.

The circuit module can be used in conjunction with various small built-in antennas, such as antennas with plastic brackets and metal shrapnel, FPC antennas, PCB antennas, and ceramic antennas. The broadcast TV signal received by the built-in antenna is generally relatively weak. After controlling and amplifying the digital TV signal through this module, a more rational signal can be obtained and enter the post-stage circuit. In addition, the signal-to-noise ratio of the signal output by the low-noise amplifier will be ideal. , It is very beneficial to the subsequent circuit processing.

The above are only preferred embodiments of the present invention, and the present invention also has various other implementation modes. Those skilled in the art can make various corresponding implementations according to the present invention without departing from the spirit and essence of the present invention. Changes and deformations, but these changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (3)

1. A mobile digital TV antenna control circuit module, comprising a PCB substrate (2), an antenna matching circuit unit (3), a low-noise amplifier circuit unit (5) positioned on the PCB substrate (2), and a The circuit unit provides an LDO voltage control unit (4) with a stable power supply voltage; the digital TV signal enters the antenna matching circuit unit (3) from the receiving antenna (1) for matching adjustment, and then the signal is processed by the low noise amplifier circuit unit (5). After amplification, it is output to the subsequent circuit; It is characterized in that: the control circuit module includes at least five PIN bits, which are respectively a signal input bit (6) for receiving a signal, a signal output bit (9) for outputting an amplified signal, and an external power supply voltage input bit (9). The voltage input bit (11), the voltage control bit (8) and the module grounding bit for controlling the working state and sleep state of the entire module; On the PCB substrate, the antenna matching circuit unit is arranged adjacent to the signal input position (6); the low noise amplifier circuit unit is arranged between the voltage control position (8) and the signal output position (9), and the module ground position Set between the signal input bit (6) and the voltage control bit (8) and the signal output bit (9); the LDO voltage control unit is adjacent to the voltage input bit (11), and is located side by side with the antenna matching circuit unit Above the low noise amplifier circuit unit; The module grounding position includes a first grounding position (7) and a second grounding position (10), the first grounding position (7) is located between the signal input position (6) and the voltage input position (11), and the second grounding position (10) is located between the voltage control bit (8) and the signal output bit (9). 2. The mobile digital TV antenna control circuit module according to claim 1, characterized in that: said control circuit module is provided with a metal shield outside. 3. The mobile digital TV antenna control circuit module according to claim 1, characterized in that: the antenna (1) is connected to the signal input bit (6) of the circuit module through a 50-ohm transmission line.

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