CN207304536U

CN207304536U - A kind of radiofrequency signal imput output circuit

Info

Publication number: CN207304536U
Application number: CN201721204857.0U
Authority: CN
Inventors: 杨俊�; 罗伟民; 邹伟
Original assignee: Shenzhen Xin Yupeng Electronic Technology Co Ltd
Current assignee: Shenzhen Xin Yupeng Electronic Technology Co Ltd
Priority date: 2017-09-19
Filing date: 2017-09-19
Publication date: 2018-05-01
Anticipated expiration: 2027-09-19

Abstract

The pin connection of a kind of radiofrequency signal imput output circuit, 1 left end RFIN2P1, RFIN2N1, RFOUT2N1, RFOUT2P1 of its radio-frequency differential match circuit and high pass wifi main control chips, the input/output terminal as RF digital signals；Its right is connected with LC changes in balance circuit 2, and the right of LC changes in balance circuit 2 is connected with signal filter circuit 3；The right of filter circuit 3 connection wireless antenna circuit 4.The utility model utilizes difference match circuit, compared to single-signal digital-to-analogue conversion process circuit, greatly enhance the processing to wireless signal precision and the utilization rate to signal conversion, and rear end using LC changes in balance circuits after once filtering, filter circuit is reused through row secondary filtering, and from the stability and reliability for enhancing module and handling wireless signal.By the connected applications to its three circuits, unnecessary component is reduced, by cost control to minimum.

Description

A kind of radiofrequency signal imput output circuit

Technical field

The technical field of radiofrequency signal processing is the utility model is related to, it is particularly a kind of to handle the defeated of wireless wifi signals Enter output processing circuit.

Background technology

With smart home concept, Internet of Things concept it is increasingly burning hoter, in the market is with wifi module wireless communications Equipment is also more and more.Particularly intelligent appliance, is required for one wifi module of band substantially, and shipment amount is got in the market Come bigger.With the development of technology of Internet of things and the attention in market, in wifi wireless communications, to the reliable of its radiofrequency signal Property, the requirement of stability it is also higher and higher, cost control to whole wifi module requires also higher and higher.

The content of the invention

The utility model is directed to high pass series wifi main control chip schemes, there is provided a kind of radiofrequency signal imput output circuit, Cost is reduced to realize, strengthens the purpose of wireless signal stability and reliability.

The RF radiofrequency signal imput output circuit technical solutions of the utility model are made of three parts：Radio-frequency differential matching electricity Road, LC changes in balance circuit, signal filter circuit.Specifically, the radiofrequency signal imput output circuit is characterized in that, including One by DC supply input 3V3_RF, the first capacitance C1, the first inductance L1, the second inductance L2, the second capacitance C2, the 3rd electricity Hold C3, the 4th capacitance C4, the 5th capacitance C5, the 8th inductance L8, the tenth inductance L10, the tenth capacitance C10, the 11st capacitance C11, 12nd capacitance C12 composition radio-frequency differential match circuit 1, one by the 6th capacitance C6, the 8th capacitance C8, the 3rd inductance L3, 9th inductance L9, the 9th capacitance C9, the LC changes in balance circuit 2 of the 7th capacitance C7 compositions, one by the 13rd capacitance C13, the Four inductance L4, the 14th capacitance C14, the 5th inductance L5, the 15th capacitance C15, the 6th inductance L6, the 17th capacitance C17, the tenth Eight capacitance C18, the 7th inductance L7, the signal filter circuit 3 and antenna circuit 4 of the 19th capacitance C19 compositions；Radio-frequency differential It is connected after connecting with the 8th inductance L8 in circuit 1 with the 11st capacitance C11 with one end of the 4th capacitance C4, the 10th inductance L10 It is connected after connecting with the 12nd capacitance C12 with one end of the 5th capacitance C5, the 8th inductance L8 one end and an input terminal RFINP1 phases Even, one end of the 10th inductance L10 is connected with another input terminal RFINP2, and the tenth capacitance C10 is connected in parallel on the 8th inductance L8 and the 10th On the other end of inductance L10, the 4th capacitance C4, the 5th capacitance C5 the other end on be parallel with the 3rd capacitance C3, output terminal RFOUT2P1, output terminal RFOUT2N1 are connected on the 3rd capacitance C3 both ends respectively, by the first capacitance C1, the first inductance L1, The lc circuit that two inductance L2, the second capacitance C2 are composed in parallel, and the pin through the first inductance L1 and output terminal RFOUT2P1 phases Even, the pin through the second inductance L2 is connected with output terminal RFOUT2N1, the input letter from input port RFINP1, RFINP2 Number by entering LC changes in balance circuits through the 6th capacitance C6, the 8th capacitance C8 in LC changes in balance circuit 2 after aforementioned circuit 2；One end ground connection of the 6th capacitance C6, the 7th capacitance C7 in LC changes in balance circuit 2, the other end have been connected after the 3rd inductance L3 It is in parallel, is connected after the 9th capacitance C9 of other end series connection of foregoing 8th capacitance C8 with the other end of the 7th capacitance C7.

The signal filter circuit 3 is made of the Π type LC filter circuits of multigroup series connection, and its one end is through its 13rd capacitance C13 is connected with one end of the 7th capacitance C7 in LC changes in balance circuit 2, its other end connect through antenna circuit 4 the 16th Capacitance C16 is connected with antenna circuit 4.

The utility model utilizes difference match circuit, compared to single-signal digital-to-analogue conversion process circuit, greatly enhances Processing to wireless signal precision and the utilization rate to signal conversion, and passed through in rear end using LC changes in balance circuit and once filtered After ripple, filter circuit is reused through row secondary filtering, and from the stability and reliability for enhancing module and handling wireless signal. By the connected applications to its three circuits, unnecessary component is reduced, by cost control to minimum.

Brief description of the drawings

Fig. 1 is the utility model circuit diagram；

Fig. 2 is the functional-block diagram of Fig. 1.

Embodiment

As shown in functional-block diagram 2, radio-frequency differential matching technique circuit is also known as TX/RX match circuit, its left end RFIN2P1, RFIN2N1, RFOUT2N1, RFOUT2P1 will be connected with the pin of high pass wifi main control chips, be believed as RF numerals Number input/output terminal；Its right is connected with LC changes in balance circuit 2, and LC changes in balance circuit 2 is also known as LC Balun；LC It is connected on the right of Balun with signal filter circuit 3Filter；Connection wireless antenna circuit 4 (ant1) on the right of Filter.

Radio-frequency differential match circuit inputs 2 railway digital signals, carries out difference matching treatment output analog signal all the way, the letter Number once filtered by LC changes in balance circuits, export secondary analog signal, secondary analog signal is filtered by signal again Circuit, filters out residual spur, forms final preferable simulation new signal, is sent finally by antenna；Meanwhile antenna electric (ant1) receives air analog signal on road 4, first pass around signal filter circuit obtain needed for frequency band signals, input to LC Balun, LC changes in balance circuit refilter clutter in required frequency band signals, obtain project verification analog signal output and match electricity to difference The analog signal is carried out analog-to-digital conversion process output two-pass DINSAR digital circuit, finally gives high pass by road, difference match circuit Wifi main control chips.And the straight of 3.3V is provided to whole radiofrequency signal imput output circuit in radio-frequency differential match circuit Flow power input.

Embodiment is as shown in Figure 1.Including one by DC supply input 3V3_RF, the first capacitance C1, the first electricity Feel L1, the second inductance L2, the second capacitance C2, the 3rd capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 8th inductance L8, the tenth electricity Feel L10, the tenth capacitance C10, the 11st capacitance C11, the 12nd capacitance C12 composition radio-frequency differential match circuit 1, one by 6th capacitance C6, the 8th capacitance C8, the 3rd inductance L3, the 9th inductance L9, the 9th capacitance C9, the LC balances of the 7th capacitance C7 compositions Varying circuit 2, one by the 13rd capacitance C13, the 4th inductance L4, the 14th capacitance C14, the 5th inductance L5, the 15th capacitance C15, the 6th inductance L6, the 17th capacitance C17, the 18th capacitance C18, the 7th inductance L7, the signal of the 19th capacitance C19 compositions Filter circuit 3 and antenna circuit 4；After the 8th inductance L8 in radio-frequency differential match circuit (1) connects with the 11st capacitance C11 It is connected with one end of the 4th capacitance C4, one end phase with the 5th capacitance C5 after the 10th inductance L10 connects with the 12nd capacitance C12 Even, the 8th inductance L8 one end is connected with an input terminal RFINP1, one end of the 10th inductance L10 and another input terminal RFINP2 phases Even, the tenth capacitance C10 is connected in parallel on the other end of the 8th inductance L8 and the 10th inductance L10, the 4th capacitance C4, the 5th capacitance C5 The other end on be parallel with the 3rd capacitance C3, output terminal RFOUT2P1, output terminal RFOUT2N1 are connected on the 3rd capacitance C3 two respectively On end, the lc circuit that is composed in parallel by the first capacitance C1, the first inductance L1, the second inductance L2, the second capacitance C2, and through the first electricity A pin of sense L1 is connected with output terminal RFOUT2P1, and the pin through the second inductance L2 is connected with output terminal RFOUT2N1, comes From the input signal of input port RFINP1, RFINP2 by after aforementioned circuit through the 6th capacitance in LC changes in balance circuit 2 C6, the 8th capacitance C8 enter LC changes in balance circuit 2；The 6th capacitance C6's, the 7th capacitance C7 in LC changes in balance circuit (2) One end is grounded, and the other end has connected and has been in parallel after the 3rd inductance L3, and the other end of foregoing 8th capacitance C8 is connected the 9th capacitance C9 The other end with the 7th capacitance C7 is connected afterwards.

Referring to Fig. 1,2, in the operation of whole circuit, when wifi wireless communication modules send signal, digital signal is from a left side Turn right, input two-way RFIN2P1 and RFIN2N1, RFIN2P1 input the 8th inductance L8, then be output to the 11st capacitance of series connection C11, then the 6th capacitance C6 of parallel connection is output to, the 11st capacitance C11 is output to the 3rd inductance L3, then exports the 7th capacitance C7 It is connected to ground, the input exported as signal filter circuit of the 3rd inductance L3.RFIN2N1 is input to the tenth inductance L10, then The 12nd capacitance C12 is output to, then exports the 8th capacitance C8, is being output to the 9th inductance L9, the other end and the ground of nine inductance L9 Connection, is output to the 9th capacitance C9, is then incorporated as the input of signal filter circuit 2 afterwards.Two ways of digital signals is by poor 2 after point match circuit 1 and LC balancing circuitrys, analog circuit all the way is formed, is input to one end of the 13rd capacitance C13 of parallel connection, One end of 13rd capacitance C13 is connected to ground, the 4th inductance L4 being concatenated between C13, C14, then Parallel opertation is electric to the 5th Feel L5, through the 15th capacitance C15 Parallel opertations to the 6th inductance L6, be output to the 17th capacitance C17 afterwards, C17 is exported simultaneously again Join the 18th capacitance C18, through the 7th inductance L7, then connect and be output to the 19th capacitance C19.Meanwhile antenna circuit 4 is that L5 is defeated Go out 16th capacitance C16 of input in parallel, then connect and be output to antenna, the other end of antenna is connected to ground.

When wifi wireless communication modules receive wireless signal, radio wave passes through antenna circuit 4 and signal filter circuit 3 form analog circuit all the way, turn left from the right side, the input of the 4th inductance L4 of signal filter circuit, becomes the analog signal at this time Output, it is changed into LC balancing circuitrys 2 again, and difference respectively becomes the 3rd inductance L3's and the 9th capacitance C9 into two-way analog circuit Input.The output of LC changes in balance circuits is the output of L3 and the output of the 8th capacitance C8.L3 exports analog signal, and input is simultaneously Join the 6th capacitance C6 to be connected to ground, input capacitance C4 in parallel, then output-parallel the second inductance L2, then the second capacitance of output-parallel C2 It is connected to ground, and C4 outputs are directly connected to RFOUT2P1.C8 analog signal outputs the 5th capacitance C5 of series connection, then output-parallel 3rd capacitance C3, Parallel opertation the first inductance L1, then the first capacitance of Parallel opertation C1 are connected to ground, and C5 Parallel opertations are straight RFOUT2N1 is met in succession.

Claims

1. a kind of radiofrequency signal imput output circuit, it is characterised in that including one by DC supply input 3V3_RF, the first electricity Hold C1, the first inductance L1, the second inductance L2, the second capacitance C2, the 3rd capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 8th electricity Feel the radio-frequency differential matching electricity of L8, the tenth inductance L10, the tenth capacitance C10, the 11st capacitance C11, the 12nd capacitance C12 compositions Road (1), one by the 6th capacitance C6, the 8th capacitance C8, the 3rd inductance L3, the 9th inductance L9, the 9th capacitance C9, the 7th capacitance C7 The LC changes in balance circuit (2) of composition, one by the 13rd capacitance C13, the 4th inductance L4, the 14th capacitance C14, the 5th inductance L5, the 15th capacitance C15, the 6th inductance L6, the 17th capacitance C17, the 18th capacitance C18, the 7th inductance L7, the 19th capacitance The signal filter circuit (3) and antenna circuit (4) of C19 compositions；The 8th inductance L8 in radio-frequency differential match circuit (1) and Be connected after 11 capacitance C11 series connection with one end of the 4th capacitance C4, the 10th inductance L10 connect with the 12nd capacitance C12 after with the One end of five capacitance C5 is connected, and the 8th inductance L8 one end is connected with an input terminal RFINP1, one end of the 10th inductance L10 with it is another Input terminal RFINP2 is connected, and the tenth capacitance C10 is connected in parallel on the other end of the 8th inductance L8 and the 10th inductance L10, the 4th capacitance C4, the 5th capacitance C5 the other end on be parallel with the 3rd capacitance C3, output terminal RFOUT2P1, output terminal RFOUT2N1 are connected on respectively On 3rd capacitance C3 both ends, the LC composed in parallel by the first capacitance C1, the first inductance L1, the second inductance L2, the second capacitance C2 is electric Road, and the pin through the first inductance L1 is connected with output terminal RFOUT2P1, a pin and output terminal through the second inductance L2 RFOUT2N1 is connected, and the input signal from input port RFINP1, RFINP2 passes through electric through LC changes in balance after aforementioned circuit The 6th capacitance C6, the 8th capacitance C8 in road (2) enter LC changes in balance circuit (2)；The 6th in LC changes in balance circuit (2) One end ground connection of capacitance C6, the 7th capacitance C7, the other end have connected and have been in parallel after the 3rd inductance L3, and foregoing 8th capacitance C8's is another It is connected after the 9th capacitance C9 of one end series connection with the other end of the 7th capacitance C7.

2. radiofrequency signal imput output circuit as claimed in claim 1, it is characterised in that：The signal filter circuit (3) by The Π type LC filter circuits composition of multigroup series connection, its one end is through the in its 13rd capacitance C13 and LC changes in balance circuit (2) One end of seven capacitance C7 is connected, and the 16th capacitance C16 that its other end is connected through antenna circuit (4) is connected with antenna circuit (4).