CN216290937U

CN216290937U - TDD's Cat.1bis circuit and circuit module

Info

Publication number: CN216290937U
Application number: CN202122308192.0U
Authority: CN
Inventors: 于海波; 孙香涛; 潘璐
Original assignee: Zhejiang Lierda Internet Of Things Technology Co ltd
Current assignee: Zhejiang Lierda Internet Of Things Technology Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-04-12
Anticipated expiration: 2031-09-22

Abstract

The invention discloses a TDD Cat.1bis circuit and a circuit module, which comprise a main chip, a PMU, a 32Khz crystal, a PA power amplifier, a matching circuit 1, a matching circuit 2, a matching circuit 3, a matching circuit 4, a matching circuit 5, a matching circuit 6, a matching circuit 7, a matching circuit 8, a matching circuit 9, a matching circuit 10, a matching circuit 11, an LPF low-pass filter, a high-frequency Switch and a duplexer, wherein a Band38 or Band40 or Band41 transmitting circuit, a Band38 or Band40 or Band41 receiving circuit, a Band34 or Band39 transmitting circuit and a Band34 or Band39 receiving circuit are formed; the four signal transmitting and receiving functions operate simultaneously and in the same communication module, so that the circuit and the circuit module are simple in design, and the cost of the whole module is reduced; the complete one-way transmitting signal loop filters interference signals, improves the stability of a communication system, and improves the accuracy and the integrity of signal communication.

Description

TDD's Cat.1bis circuit and circuit module

Technical Field

The invention relates to the field of circuit control, in particular to a Cat.1bis circuit module of TDD.

Background

In a mobile communication system in TDD mode, reception and transmission are in different time slots of the same frequency channel (i.e., carrier), with guaranteed time separating the reception and transmission channels. The mode has incomparable flexibility in asymmetric services, TD-SCDMA only needs frequency allocation of an asymmetric frequency band, and each carrier wave of the TD-SCDMA is 1.6 MHz. Because the switching point of the uplink and downlink switching of the time domain in each RC can be flexibly changed, the wireless spectrum can be fully utilized for symmetric services (voice, multimedia and the like) and asymmetric services (packet switching, Internet and the like).

By 8 months in 2020, dozens of Cat.1bis modules carrying Chunreng 8910DM chips are on the market and applied to multiple fields and scenes. The technology comprises China Mobile, China Unicom, Guanghe and Tong, a plurality of module manufacturers such as Square science and technology, American intelligence, Zea, Longshang, the Internet of things and the like select the ShaoyingChunreng 8910DM chip, and a series of Cat.1bis modules are released, so that the technology can be widely applied to scenes such as shared economy, financial payment, public network talkback, energy, industrial control and the like.

At present, a Cat.1bis circuit is mainly a global communication frequency band circuit and a module, or a national communication frequency band circuit and a module in China; the Cat.1bis module is mainly applied to the Internet of things communication module, has very strict requirements on cost, can meet the requirement of the Internet of things communication module in a fixed scene in the market application process due to the fact that the circuit cost is high, and operators and frequency bands are fixed after a certain area is selected.

For example, a "TDD communication method" disclosed in chinese patent literature, whose publication number is CN 104993858B, includes the problems of easy signal processing and complexity, high circuit module cost, and troublesome product maintenance while supporting various communication products.

Disclosure of Invention

The invention provides an ultra-low cost, fixed communication frequency band and a brand-new circuit and circuit module which only support a TDD mode of a China mobile frequency band for Cat.1bis Internet of things product communication, reduces the use cost of communication products, and is convenient for maintenance of the communication products and iterative update of subsequent products.

In order to achieve the purpose, the invention adopts the following technical scheme:

a TDD Cat.1bis circuit and circuit module comprises a main chip, a PMU, a 32Khz crystal, a PA power amplifier, a matching circuit 1, a matching circuit 2, a matching circuit 3, a matching circuit 4, a matching circuit 5, a matching circuit 6, a matching circuit 7, a matching circuit 8, a matching circuit 9, a matching circuit 10, a matching circuit 11, an LPF low-pass filter, a high-frequency Switch and a duplexer, and forms a Band38 or Band40 or Band41 transmitting circuit, a Band38 or Band40 or Band41 receiving circuit, a Band34 or Band39 transmitting circuit and a Band34 or Band39 receiving circuit, the circuit design is simpler, and the production cost of the circuit and the circuit module is effectively reduced.

Preferably, the TDD supporting frequency bands of the matching circuit and the circuit module comprise Band34 (2010 Mhz-2025 Mhz), Band38 (2570 Mhz-2620 Mhz), Band39 (1880 Mhz-1920 Mhz), Band40 (2300 Mhz-2400 Mhz) and Band41 (2496 Mhz-2690 Mhz).

Preferably, the Band34 frequency Band, the Band38 frequency Band, the Band39 frequency Band, the Band40 frequency Band and the Band41 frequency Band can operate simultaneously under the support of the TDD frequency Band, thereby improving the signal communication efficiency.

Preferably, when the Band38, the Band40 or the Band41 transmits signals, and when the Band38, the Band40 or the Band41 transmits signals, the control signals sequentially pass through the RF transmitter and Subsystem of the main chip, the matching circuit 1, the HBIN pin of the PA power amplifier, the matching circuit 2, the LPF low-pass filter, the matching circuit 3, the high-frequency Switch and the matching circuit 12, and finally reach the ANT wireless communication module to form a complete unidirectional transmission signal loop, so that interference signals are filtered, the stability of the communication system is improved, and the accuracy of signal communication is improved.

Preferably, when receiving the Band38, the Band40 or the Band41, the control signal passes through the ANT wireless communication module, the matching circuit 12, the high frequency Switch, the matching circuit 3, the LPF low pass filter, the matching circuit 2 and the PA power amplifier in sequence, then the PA signal is controlled to flow to the matching circuit 4, then the PA signal is accessed to the matching circuit 4 to match the signal flowing through the PA, then the signal flows through the matching circuit 5, finally the signal flows into the RF _ RX _ LTE _ HB _ P of the main chip RF Transceiver and Subsystem, and operates simultaneously with the signal transmission of the Band38, the Band40 or the Band41, so that the working efficiency of the whole communication module is improved, and the cost of the cat.1bis module is reduced.

Preferably, when the Band34 or the Band39 transmits signals, the signals of the Band34 or the Band39 are generated on the RF _ TX _ LTE _ MB after being debugged by the RF transmitter and Subsystem of the main chip, the circuits are matched to 50 Ω through the matching circuit 6, the amplified debugging signals are output after being amplified by the PA through the MBIN of the PA, the matching is matched to the efficiency of the PA and the middle position of the ACP through the matching circuit 7, and the second harmonic is filtered out through filtering in the matching circuit. Then to the high frequency Switch, the signal goes to the matching circuit 12 again to prevent the signal from deviating from 50 Ω after passing through the high frequency Switch, this matching circuit purpose makes output 50 Ω standard interface, then the signal reaches ANT, constitutes complete one-way transmission signal return circuit, and the stability of communication system is improved to the filtering interference signal, improves signal communication's accuracy and integrality.

Preferably, when receiving the signal, the Band34 or Band39 passes through the ANT wireless communication module, the matching circuit 12 and the high frequency Switch in sequence, then the Bnad34 is connected to the matching circuit 8, the Band39 is connected to the matching circuit 9, the Band34 and the Band39 are connected to the duplexer, the Band34 and the Band39 signals are combined and connected to the matching circuit 10 for matching, then the signal enters the matching circuit 11, finally the signal flows into the RF _ RX _ LTE _ MB _ P of the RF Transceiver and Subsystem, and operates simultaneously with the signal transmission of the Band34 or Band39, so that the working efficiency of the whole communication module is improved, and the cost of the cat.1bis module is reduced.

Preferably, the four signal transmitting and receiving functions operate simultaneously and in the same communication module, the circuit and the circuit module are simple in design, and the cost of the whole module is reduced.

Therefore, the invention has the following beneficial effects:

the four signal transmitting and receiving functions operate simultaneously and in the same communication module, so that the circuit and the circuit module are simple in design, and the cost of the whole module is reduced;

the complete one-way transmitting signal loop filters interference signals, improves the stability of a communication system, and improves the accuracy and the integrity of signal communication.

Drawings

FIG. 1 is a schematic diagram of a design configuration of the present invention;

FIG. 2 is a flow chart of the function of Band38 or Band40 or Band41 signal transmission;

FIG. 3 is a flow chart of the function of receiving a Band38 or Band40 or Band41 signal;

FIG. 4 is a flow chart of the Band34 or Band39 signal transmission function;

fig. 5 is a flow chart of the function of Band34 or Band39 signal reception.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

As shown in fig. 1, a cat.1bis circuit and a circuit module of TDD include a main chip, PMU, 32Khz crystal, PA power amplifier, matching circuit 1, matching circuit 2, matching circuit 3, matching circuit 4, matching circuit 5, matching circuit 6, matching circuit 7, matching circuit 8, matching circuit 9, matching circuit 10, matching circuit 11, LPF low pass filter, high frequency Switch and duplexer, which form a Band38 or Band40 or Band41 transmitting circuit, a Band38 or Band40 or Band41 receiving circuit, a Band34 or Band39 transmitting circuit, and a Band34 or Band39 receiving circuit, and the circuit design is simple, thereby effectively reducing the production cost of the circuit and the circuit module.

The TDD supporting frequency bands of the matching circuit and the circuit module comprise Band34 (2010 Mhz-2025 Mhz), Band38 (2570 Mhz-2620 Mhz), Band39 (1880 Mhz-1920 Mhz), Band40 (2300 Mhz-2400 Mhz) and Band41 (2496 Mhz-2690 Mhz).

The Band34 frequency Band, the Band38 frequency Band, the Band39 frequency Band, the Band40 frequency Band and the Band41 frequency Band can operate simultaneously under the support of the TDD frequency Band, and the signal communication efficiency is improved.

As shown in fig. 2, when the Band38 or Band40 or Band41 transmits signals, the communication signals are debugged by RF transmitter and Subsystem of the main chip to generate a transmission signal of Band38 or Band40 or Band41 on RF _ TX _ LTE _ HB, the circuit is matched to 50 Ω by the matching circuit 1, the amplified debugging signal is output by HBIN of PA, the matching is matched to the efficiency of PA and the middle position of ACP by the matching circuit 2, the interference signals above 2690Mhz, including the second harmonic and the third harmonic, are filtered by the LPF low pass filter, the microstrip line impedance of PCB is matched by the matching circuit 3, then to the high frequency Switch, the signals are further matched to the matching circuit 12 to prevent the signals from deviating from 50 Ω after passing through the high frequency Switch, the matching circuit aims to output 50 Ω standard interface, then the signals reach ANT to form a complete unidirectional transmission signal loop, and the interference signals are filtered, the accuracy of signal communication is improved.

As shown in fig. 3, when receiving a signal from Band38, Band40 or Band41, the signal passes through ANT, matching circuit 12 to prevent mismatch, high frequency Switch, matching circuit 3 to match the impedance of PCB, LPF low pass filter to remove the frequency Band higher than 2690Mhz, matching circuit 2 matching network, PA, and matching circuit 4 to control PA signal flow, the utility model saves an external high frequency Switch by using the Switch inside PA, since the matching circuit 2 may be mismatched, the signal flowing through PA needs to be matched by matching circuit 4, then flows through matching circuit 5 to match the signal, finally flows into RF _ RX _ LTE _ HB _ P of RF microstrip line transmitter and Subsystem to operate simultaneously with the signal transmission of Band38, Band40 or Band41, so as to improve the working efficiency of the whole communication module, the cost of the Cat.1bis module is reduced.

As shown in fig. 4, when the Band34 or the Band39 transmits a signal, the signal is debugged by an RF Transceiver and Subsystem of a main chip to generate a Band34 or Band39 signal on RF _ TX _ LTE _ MB, the circuit is matched to 50 Ω by a matching circuit 6, the amplified debugging signal is output by the amplifier of PA after MBIN of PA, the matching is matched to the efficiency of PA and the middle position of ACP by a matching circuit 7, and the second harmonic is filtered by the filter in the matching circuit. Then to the high frequency Switch, the signal goes to the matching circuit 12 again to prevent the signal from deviating from 50 Ω after passing through the high frequency Switch, this matching circuit purpose makes output 50 Ω standard interface, then the signal reaches ANT, constitutes complete one-way transmission signal return circuit, and the stability of communication system is improved to the filtering interference signal, improves signal communication's accuracy and integrality.

As shown in fig. 5, when receiving a signal, Band34 or Band39 passes through ANT, then passes through matching circuit 12 to prevent mismatch, passes through high-frequency Switch, Bnad34 passes through matching circuit 8 to match the impedance of the PCB, Band39 passes through matching circuit 9 to match the impedance of the PCB, Band34 and Band39 pass through the duplexer, combine the two signals, Band34 and Band39, then match the signals through matching circuit 10 to prevent impedance mismatch flowing through the duplexer, then the signal enters matching circuit 11 to match the microstrip line of the PCB, finally the signal flows into RF _ RX _ LTE _ MB _ P of RF Transceiver and Subsystem to operate simultaneously with signal transmission of Band34 or Band39, thereby improving the working efficiency of the whole communication module and reducing the cost of cat.

The four signal transmitting and receiving functions operate simultaneously and in the same communication module, the circuit and the circuit module are simple in design, and the cost of the whole module is reduced.

The above-described embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims

1. A kind of TDD's Cat.1bis circuit and circuit module, characterized by, including main chip, PMU, 32Khz crystal, PA power amplifier, matching circuit 1, matching circuit 2, matching circuit 3, matching circuit 4, matching circuit 5, matching circuit 6, matching circuit 7, matching circuit 8, matching circuit 9, matching circuit 10, matching circuit 11, LPF low pass filter, high frequency Switch, duplexer and ANT wireless communication module, make up Band38 or Band40 or Band41 transmitting circuit, Band38 or Band40 or Band41 receiving circuit, Band34 or Band39 transmitting circuit, Band34 or Band39 receiving circuit.

2. The circuit and circuit module of claim 1, wherein the TDD-supported frequency bands of the matching circuit and circuit module include Band34 (2010 Mhz-2025 Mhz), Band38 (2570 Mhz-2620 Mhz), Band39 (1880 Mhz-1920 Mhz), Band40 (2300 Mhz-2400 Mhz), and Band41 (2496 Mhz-2690 Mhz).

3. The circuit and circuit module as claimed in claim 1 or 2, wherein the Band34 Band, the Band38 Band, the Band39 Band, the Band40 Band and the Band41 Band can be operated simultaneously with the support of TDD Band.

4. The Cat.1bis circuit and circuit module of TDD according to claim 1, wherein when Band38 or Band40 or Band41 is transmitting, the control signal passes through RF Transceiver and Subsystem of main chip, matching circuit 1, HBIN pin of PA power amplifier, matching circuit 2, LPF low pass filter, matching circuit 3, high frequency Switch, matching circuit 12 in sequence, finally the signal reaches ANT wireless communication module.

5. The Cat.1bis circuit and circuit module of TDD according to claim 1 or 4, wherein when Band38 or Band40 or Band41 receives, the control signal passes through ANT wireless communication module, matching circuit 12, high frequency Switch, matching circuit 3, LPF low pass filter, matching circuit 2, PA power amplifier in sequence, then controls PA signal to flow to matching circuit 4, then enters matching circuit 4 to match the signal flowing through PA, then the signal flows through matching circuit 5, finally the signal flows into RF _ RX _ LTE _ HB _ P of main chip RF Transceiver and Subsystem.

6. The Cat.1bis circuit and the circuit module of TDD according to claim 1, wherein when the Band34 or Band39 is transmitting, the control signal passes through RF transmitter and Subsystem of the main chip, the matching circuit 6, MBIN pin of the PA power amplifier, the amplified PA is connected to output the amplified debugging signal, then passes through the matching circuit 7, the high frequency Switch, the matching circuit 12, and finally the signal reaches the ANT wireless communication module.

7. The cat.11 bis circuit and circuit module of the TDD according to claim 1 or 6, wherein when receiving Band34 or Band39, after the signal passes through ANT wireless communication module, matching circuit 12 and high frequency Switch in sequence, Bnad34 is connected to matching circuit 8, Band39 is connected to matching circuit 9, Band34 and Band39 are connected to duplexer, and after combining Band34 and Band39, the signal is connected to matching circuit 10 for matching, then the signal enters matching circuit 11, and finally the signal flows into RF _ RX _ LTE _ MB _ P of RF Transceiver and Subsystem.