CN211406018U - Radio frequency processing circuit for functional mobile phone - Google Patents
Radio frequency processing circuit for functional mobile phone Download PDFInfo
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- CN211406018U CN211406018U CN202020599083.1U CN202020599083U CN211406018U CN 211406018 U CN211406018 U CN 211406018U CN 202020599083 U CN202020599083 U CN 202020599083U CN 211406018 U CN211406018 U CN 211406018U
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Abstract
The utility model discloses a radio frequency processing circuit for function cell-phone, including the main chip, the main chip is connected with antenna signal receiving module respectively, radio frequency processing module, clock oscillation circuit, system power module, USB data receiving module and audio processing module, wherein, including the radio frequency transceiver, the radio frequency transceiver is connected with frequency-selecting network respectively, isolating circuit, 1800/1900MHz mode converting circuit and 850/900MHz mode converting circuit, the radio frequency transceiver still connects and receives the base station signal, still be equipped with electric capacity C121 between resistance R104 and the radio frequency transceiver, the radio frequency transceiver still is connected with the control signal receiving terminal, the control signal receiving terminal receives control signal and sends for the radio frequency transceiver, the power pin of radio frequency transceiver still is connected with the power; the signals sent by an external mobile phone are screened through a frequency selection network, and the signals of the main chip end of the mobile phone are processed and screened in a frequency division mode, so that the use pressure of a radio frequency transceiver is reduced, and the working efficiency of the radio frequency transceiver is improved.
Description
Technical Field
The utility model relates to a function cell-phone radio frequency analog signal handles the field, specifically is a radio frequency processing circuit for function cell-phone.
Background
The short term Radio Frequency (RF) is radio frequency current, which is a short term for high frequency Alternating Current (AC) variable electromagnetic wave. Alternating current that changes less than 1000 times per second is called low frequency current, and alternating current that changes more than 10000 times per second is called high frequency current, and radio frequency is such a high frequency current. In the theory of electronics, current flows through a conductor, and a magnetic field is formed around the conductor; an alternating current passes through a conductor, around which an alternating electromagnetic field, called an electromagnetic wave, is formed. When the frequency of the electromagnetic waves is lower than 100kHz, the electromagnetic waves can be absorbed by the ground surface and cannot form effective transmission, but when the frequency of the electromagnetic waves is higher than 100kHz, the electromagnetic waves can be transmitted in the air and reflected by an ionosphere at the outer edge of the atmosphere to form long-distance transmission capability, and the high-frequency electromagnetic waves with the long-distance transmission capability are called as radio frequency.
Because radio frequency signals are needed to carry out wireless data communication and propagation of digital audio and digital images, a corresponding radio frequency signal transceiver needs to be arranged in a functional mobile phone to carry out receiving, sending and processing of the radio frequency signals, in the prior art, only a radio frequency transceiver is usually adopted to carry out simple signal receiving and transmitting, errors often occur in application of the radio frequency signals, although frequency selection, frequency reduction, demodulation and preliminary signal restoration can be carried out in the radio frequency transceiver in the prior art, the processing efficiency of the radio frequency signals is still low, and the analysis and processing of the radio frequency analog signals have an unstable state, so how to improve the radio frequency signal processing efficiency of the functional mobile phone on the basis of keeping the functional mobile phone stably processing the radio frequency signals becomes a problem to be solved in the field of radio frequency analog signal processing of the functional mobile phone.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art function cell-phone poor stability and the lower not enough of treatment effeciency to radiofrequency signal processing when handling analog signal, provide a radiofrequency signal processing unit of function cell-phone, effectually improved radiofrequency signal's treatment effeciency on the basis of the stability that has ensured radiofrequency signal.
The purpose of the utility model is mainly realized through the following technical scheme:
a radio frequency processing circuit for a functional mobile phone comprises a main chip, wherein the main chip is respectively connected with an antenna signal receiving module, a radio frequency processing module, a clock oscillation circuit, a system power supply module, a USB data receiving module and an audio processing module,
the antenna signal receiving module is used for receiving the antenna signal, filtering and sending the antenna signal to the main chip;
the radio frequency processing module is used for receiving the radio frequency signal after the primary processing of the main chip, modulating the radio frequency signal and then sending the radio frequency signal back to the main chip;
the clock oscillation circuit is used for oscillating, timing and generating a time signal and transmitting the time signal to the main chip in real time;
the system power supply module is used for supplying power to the main chip;
the USB data receiving module is used for receiving an external data signal and sending the data signal to the main chip;
the audio processing module is used for receiving a sound signal of external sound equipment, filtering the sound signal and sending the sound signal to the main chip;
the radio frequency processing module comprises a radio frequency transceiver which is respectively connected with a frequency selection network, an isolation circuit, an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, wherein,
the frequency selection network receives signals sent by an external mobile phone and screens out useful frequency band signals to be transmitted to the frequency transceiver;
the isolation circuit receives the high-frequency band signal and the low-frequency band signal which are primarily processed by the main chip, performs filtering processing, and then sends the high-frequency band signal and the low-frequency band signal to the radio frequency transceiver;
the 1800/1900MHz mode conversion circuit receives 1800/1900MHz signals sent by the radio frequency transceiver, converts the signals into high-frequency differential signals and then sends the converted high-frequency differential signals to the main chip;
the 850/900MHz mode conversion circuit receives 850/900MHz signals sent out from the radio frequency transceiver, converts the signals into low-frequency differential signals, and then sends the converted low-frequency differential signals to the main chip;
the radio frequency transceiver receives the high-frequency band signal and the low-frequency band signal which are processed by the isolation circuit, carries out carrier modulation and power amplification on the high-frequency band signal and the low-frequency band signal, and transmits the processed signals out of the radio frequency transceiver; receiving a frequency-selecting network signal, performing frequency selection, frequency reduction, demodulation and preliminary signal reduction processing on the signal, respectively sending the processed signal to an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, converting the signal into a high-frequency differential signal through the 1800/1900MHz mode conversion circuit, sending the high-frequency differential signal to a main chip, converting the signal into a low-frequency differential signal through the 850/900MHz mode conversion circuit, and sending the low-frequency differential signal to the main chip;
the radio frequency transceiver is also connected with a resistor R104, the other end of the resistor R104, which is opposite to the end connected with the radio frequency transceiver, is connected to a base station signal receiving end of the main chip, and a grounding capacitor C121 is also arranged on a line between the resistor R104 and the radio frequency transceiver; the radio frequency transceiver is also connected with a control signal receiving end, and the control signal receiving end receives the control signal of the main chip and sends the control signal to the radio frequency transceiver; the radio frequency transceiver is also connected with a power supply, and a grounding capacitor C107 and a grounding capacitor C108 are also arranged between the power supply and the radio frequency transceiver.
In the utility model, the external signal is received by the antenna signal receiving module and the radio frequency signal is sent to the radio frequency processing module after being processed primarily in the main chip, the radio frequency receiving and sending in the radio frequency processing module is mainly divided into a receiving process and a transmitting and amplifying process, wherein the receiving process is that the signal sent by the external mobile phone is received by the mobile phone antenna and then the result is processed primarily by the main chip, then the useful frequency band signal is screened out by the frequency selection network, the radio frequency transceiver is provided with an ANT pin, the useful frequency band signal enters the radio frequency transceiver through the ANT pin of the radio frequency transceiver to be processed, the signal is selected, reduced, demodulated and restored primarily by the inside of the radio frequency transceiver, the 1800/1900MHz frequency band signal is converted into the high frequency differential signal by the 1800/1900MHz mode converting circuit, the high frequency differential signal is sent to the main chip end of the mobile phone to be further processed, the 850/900MHz frequency band signal is converted into the low frequency, sending the low-frequency differential signal to a main chip end of the mobile phone for further processing; the signal after the primary processing of the main chip of the mobile phone is received in the transmitting and amplifying process, the high-frequency band signal and the low-frequency band signal are transmitted to the radio frequency transceiver for processing through the filtering processing of the isolation circuit, the radio frequency transceiver carries out the carrier modulation, the power amplification and other processing on the high-frequency band signal and the low-frequency band signal and then transmits the signals out from the ANT pin of the radio frequency transceiver, the power amplification factor is mainly adjusted by the signal receiving end of the base station according to the strength of the received base station signal so as to achieve the optimal power consumption, the frequency band selection is to carry out adaptation according to the received network condition through the control signal received by the signal receiving end, the signals sent out by an external mobile phone are screened through the frequency selection network, and the signal processing pressure of the main chip end of the mobile phone is effectively reduced through the 850/900MHz mode conversion circuit and the 1800/1900MHz mode conversion, the utility model discloses in handle screening radio frequency signal through sub-band, reduce the operating pressure of radio frequency receiving ware, improve the work efficiency of radio frequency receiving ware.
Furthermore, the 1800/1900MHz mode converting circuit includes a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C66, a capacitor C67, an inductor L4, an inductor L7, and an inductor L108, where two ends of the capacitor C67 are respectively connected to the inductor L108 and the radio frequency transceiver module, the other end of the inductor L108 opposite to the end connected to the capacitor C67 serves as a first high-frequency output terminal, one end of the capacitor C4 is connected to one end of the inductor L108 serving as a first high-frequency band signal output terminal, and the other end is grounded, a first node is disposed on a line connecting the capacitor C67 and the inductor L108, one end of the capacitor C8 is connected to the first node, the other end of the capacitor C66 serves as a second high-frequency output terminal, one end of the capacitor C66 is connected to the first node; the inductor L7 is connected with the capacitor C6 in series, the other end of the inductor L7, which is opposite to the end connected with the capacitor C6, is connected with one end of the capacitor C8, which serves as a second high-frequency wave band signal output end, and the other end of the capacitor C6 is grounded; the capacitor C7 is connected in series with the inductor L4, the other end of the capacitor C7 opposite to the end connected with the inductor L4 is connected to a line between the capacitor C67 and the radio frequency transceiver module, and the other end of the inductor L4 opposite to the end connected with the capacitor C7 is grounded.
Because mode converting circuit has the frequency bandwidth, conversion rate is high, energy consumption is low, advantage that high frequency performance is good, so the utility model discloses in adopt mode converting circuit to handle and transmit the main chip to 1800/1900 MHz's high frequency band signal be the signal of HB-RX end, receive the signal through the HB-RX end from radio frequency transceiver module, and will export the signal separation conversion of HB-RX end under the combined action of each electric capacity inductance and convert the high frequency band difference signal into, the signal of first high frequency band signal be HB-RXN end and the signal of second high frequency band signal be HB-RX P end, and export through different output, the high frequency band difference signal of output is gone into main chip by HB-RX N end and HB-RX P end and is carried out further processing.
Furthermore, the 850/900MHz mode conversion circuit includes a capacitor C105, a capacitor C63, a capacitor C65, a capacitor C129, a capacitor C5, a capacitor C64, an inductor L10, an inductor L3, and an inductor L2, two ends of the capacitor C64 are respectively connected to the inductor L2 and the radio frequency transceiver module, another end of the inductor L2, which is opposite to the end connected to the capacitor C64, serves as a first low-frequency output end, one end of the capacitor C105 is connected to one end of the inductor L2, which serves as a first low-frequency band signal output end, another end of the capacitor C387 is grounded, a second node is disposed on a line connecting the capacitor C64 and the inductor L2, one end of the capacitor C129 is connected to the second node, another end of the capacitor C129 serves as a second low-frequency output end, one end of the capacitor C5 is; the inductor L3 is connected in series with the capacitor C63, the other end of the inductor L3, which is opposite to the end connected with the capacitor C63, is connected with one end of the capacitor C129 serving as a second low-frequency waveband signal output end, and the other end of the capacitor C63 is grounded; the capacitor C65 is connected in series with the inductor L10, the other end of the capacitor C65 opposite to the end connected with the inductor L10 is connected to a line between the capacitor C64 and the radio frequency transceiver module, and the other end of the inductor L10 opposite to the end connected with the capacitor C65 is grounded.
Also, based on the advantages of the mode switching circuit, such as wide frequency band, high switching rate, low energy consumption and good high frequency performance, therefore, the utility model also uses the mode switching circuit to process the 850/900MHz low frequency band signal, namely LB-RX signal and transmit it to the main chip, by receiving signals from an LB-RX pin of a radio frequency transceiver module and separating and converting the signals output by the LB-RX pin into differential signals under the combined action of each capacitor and inductor, a first low-frequency band signal, namely a signal at an LB-RX N end, and a second low-frequency band signal, namely a signal at an LB-RX P end, and the output differential signals are divided into signals of an LB-RX N end and signals of an LB-RX P end, and the signals enter a main chip of the mobile phone from the LB-RX N end and the LB-RX P end for further processing.
Further, the isolation circuit comprises a capacitor C59, a capacitor C60, a capacitor C61, a capacitor C62, a capacitor C120, a capacitor C109, a resistor R26 and a resistor R27, wherein the capacitor C120 and the resistor R27 are connected in series, the other end of the capacitor C120, which is opposite to the end connected with the resistor R27, is used as a high-frequency band signal input end, and the other end of the resistor R27, which is opposite to the end connected with the capacitor C120, is connected with the radio frequency transceiver module; one end of the capacitor C62 is connected to a line between the capacitor C120 and the resistor R27, the other end of the capacitor C62 is grounded, one end of the capacitor C61 is connected to a line between the resistor R27 and the radio frequency transceiver module, and the other end of the capacitor C61 is grounded; the capacitor C109 is connected with the resistor R26 in series, the other end of the capacitor C109, which is opposite to the end connected with the resistor R26, is used as a low-frequency waveband signal input end, and the other end of the resistor R26, which is opposite to the end connected with the capacitor C109, is connected with the radio frequency transceiving module; one end of the capacitor C60 is connected to the line between the capacitor C109 and the resistor R26, and the other end thereof is grounded, and one end of the capacitor C59 is connected to the line between the resistor R26 and the rf transceiver module, and the other end thereof is grounded.
The utility model discloses in keep apart HB-TX signal and low frequency band signal LB-TX signal input and radio frequency transceiver module through the high frequency band signal of isolating circuit with the cell-phone owner chip promptly, get rid of the interference to high frequency band signal HB-TX signal and low frequency band signal LB-TX signal through isolating circuit's effect, make radio frequency transceiver module can obtain stable effectual signal input, through electric capacity C59, electric capacity C60, electric capacity C61 and electric capacity C62's filtering action, make the clutter of HB-TX signal and LB-TX signal of inputing among the radio frequency transceiver module eliminated.
Furthermore, the control signal receiving end comprises a PA-EN connection point, a first control signal input end and a second control signal input end, the PA-EN connection point is connected with the radio frequency transceiving module, and a grounding capacitor C56 is arranged on a circuit between the PA-EN connection point and the radio frequency transceiving module; the first control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C57 is arranged on a line between the first control signal input end and the radio frequency transceiving module; the second control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C58 is arranged on a line between the second control signal input end and the radio frequency transceiving module.
The utility model provides a PA-EN tie point connects amplifier circuit, make radio frequency transceiver module's signal amplification, control signal divide into first control signal CTR-BS1 and second control signal CTR-BS2 promptly, the last pin of radio frequency transceiver module is CTRL1 and CTRL0, and CTRL1 and CTRL-BS 2 are through the mode in sending received control signal to radio frequency transceiver module, make the frequency channel of radio frequency transceiver module can effectual selection adaptation, thereby the effectual function of realizing frequency selection of help radio frequency transceiver module, in the control signal receiving terminal, electric capacity C56, electric capacity C57 and electric capacity C58 all ground connection, the effect of filtering is all played to this three electric capacity, can effectual filtering clutter, with control signal and the stable effectual conveying of amplifying signal.
Further, the frequency selection network comprises an inductor L103 and an inductor L8 which are connected in series, the other end of the inductor L103, which is connected with the end of the inductor L8, is connected with the radio frequency transceiver module, the other end of the inductor L8, which is connected with the end of the inductor L103, is connected with the mobile phone antenna, a ground capacitor C2 is connected on a line between the inductor L103 and the inductor L8, and a ground capacitor C1 is arranged on a line between the inductor L8 and the mobile phone antenna. The utility model discloses an inductance L103 and the signal that inductance L8 sent outside cell-phone of establishing ties play the filtering action for the current signal input radio frequency transceiver module of suitable frequency, and electric capacity C2 and electric capacity C1 filtering clutter in the frequency-selective network, further work pressure who has alleviateed radio frequency transceiver module.
Furthermore, the antenna signal receiving module comprises an inductor L1, a capacitor C24, a capacitor C77 and an antenna, wherein the inductor L1 is connected with the antenna in series, the other end of the inductor L1, which is connected with the antenna end relatively, is connected with the main chip, one end of the capacitor C24 is connected to a line between the inductor L1 and the main chip, the other end of the capacitor C24 is grounded, one end of the capacitor C77 is connected to a line between the inductor L1 and the antenna, and the other end of the capacitor C77 is grounded. The utility model provides an antenna signal receiving module is equipped with the antenna in, carry out radiofrequency signal's receipt through the antenna, and carry out filtering processing through antenna signal receiving module, after antenna signal receiving module carries out filtering processing, radiofrequency signal sends main chip, main chip carries out preliminary quenching and tempering after and sends radiofrequency signal to radiofrequency processing module, and receive radiofrequency signal after radiofrequency processing module handles, after filtering through antenna signal receiving module, can make the radiofrequency signal that main chip received more stable and pure, the mixed and disorderly of having avoided radiofrequency signal causes the influence to signal processing.
Furthermore, the clock oscillation circuit comprises a crystal oscillator, a first crystal oscillator output pin and a second crystal oscillator output pin are arranged on the main chip, the first crystal oscillator output pin is connected with one end of the crystal oscillator, the second crystal oscillator output pin is connected with the other end of the crystal oscillator, and the crystal oscillator is grounded. The crystal oscillator in the utility model is manufactured by utilizing the piezoelectric effect of the crystal, when alternating voltage is applied to two surfaces of the wafer, the wafer can be repeatedly and mechanically deformed to generate vibration, and the mechanical vibration can generate the alternating voltage in turn; when the frequency of the external alternating voltage is a certain specific value, the amplitude is obviously increased and is much larger than the amplitude under other frequencies, and resonance is generated, and the phenomenon is called piezoelectric resonance; the crystal oscillator produces the additional external clock circuit of oscillation, the utility model discloses in be an enlarged feedback circuit, then had clock oscillator, put external clock circuit in same encapsulation the inside with the crystal oscillator, all had 4 pins, two power cords provide the power for the clock circuit of the inside, provide the benchmark for the chronogenesis through clock oscillator circuit, coordinate each part orderly run in the main chip.
Further, the system power supply module comprises a transient voltage suppression diode T3 and a power supply, wherein the power supply is connected with the main chip, one end of the transient voltage suppression diode T3 is connected to a line between the power supply and the main chip, and the other end of the transient voltage suppression diode T3 is grounded; the audio processing module comprises a capacitor C11 and a sound input end, wherein the sound input end is connected with the main chip, one end of the capacitor C11 is connected to a line between the sound input end and the main chip, and the other end of the capacitor C11 is grounded. The utility model provides a system power module provides stable power supply for main chip, audio frequency processing module has played the effect of stable transmission sound signal as analog sound signal's processing.
Further, the USB data receiving module includes a data positive signal terminal, a data negative signal terminal, a resistor R9 and a resistor R10, one end of the resistor R9 is connected to the main chip, the other end of the resistor R9 is connected to the data positive signal terminal, one end of the resistor R10 is connected to the main chip, and the other end of the resistor R10 is connected to the data negative signal terminal. The utility model provides a USB data receiving module is effectual with external data and the switch-on of main chip for main chip can stabilize effectual acquisition external data.
To sum up, compared with the prior art, the utility model has the following beneficial effects:
(1) the signal that sends outside cell-phone through the frequency selection network filters to through 850/900MHz mode converting circuit and 1800/1900MHz mode converting circuit to the processing of the signal of cell-phone owner chip end, the effectual signal processing pressure who reduces the radio frequency transceiver the utility model discloses in handle the screening radio frequency signal through dividing the sub-band, reduce the operating pressure of radio frequency transceiver, improve the work efficiency of radio frequency transceiver.
(2) Through the signal that the main chip was sent to outside cell-phone to the frequency selection network, and through 850/900MHz mode converting circuit and 1800/1900MHz mode converting circuit to the processing of the signal of cell-phone owner chip end, the effectual signal processing pressure that reduces radio frequency transceiver module the utility model discloses in handle the screening radio frequency signal through dividing the sub-band, reduce the operating pressure of radio frequency transceiver, improve the work efficiency of radio frequency transceiver.
(3)1800/1900MHz frequency band signal is converted into high frequency band differential signal by 1800/1900MHz mode converting circuit, divided into the signal of first high frequency band signal HB-RX N end and the signal of second high frequency band signal HB-RX P end, then sent to the mobile phone main chip end for further processing, 850/900MHz frequency band signal is converted into low frequency band differential signal by 850/900MHz mode converting circuit, divided into the signal of first low frequency band signal LB-RX N end and the signal of second low frequency band signal LB-RX P end, then sent to the main chip for further processing, differential signal is converted by sub-band, effective rationalization processing signal, working pressure of RF transceiver module is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a circuit diagram of the rf signal processing circuit of the present invention;
fig. 3 is a circuit diagram of 1800/1900MHz mode conversion according to the present invention;
fig. 4 is a circuit diagram of 850/900MHz mode conversion of the present invention;
fig. 5 is a system block diagram of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example (b):
as shown in fig. 1 to 5, the main chip in this embodiment is a chip with a model of ASIC-SC6531F-175-0.4, and the main chip in this embodiment is a part related to U200-B processing analog signals, and the radio frequency transceiver module in this embodiment is a chip with a model of RF-FEM-SC26 2631H.
The radio frequency processing circuit for the functional mobile phone in the embodiment comprises a main chip, wherein the main chip is respectively connected with an antenna signal receiving module, a radio frequency processing module, a clock oscillation circuit, a system power supply module, a USB data receiving module and an audio processing module,
the antenna signal receiving module is used for receiving the antenna signal, filtering and sending the antenna signal to the main chip; the antenna signal receiving module comprises an inductor L1, a capacitor C24, a capacitor C77 and an antenna, wherein the inductor L1 is connected with the antenna in series, the other end, opposite to the antenna end, of the inductor L1 is connected with the main chip, one end of the capacitor C24 is connected to a line between the inductor L1 and the main chip, the other end of the capacitor C24 is grounded, one end of the capacitor C77 is connected to a line between the inductor L1 and the antenna, and the other end of the capacitor C77 is grounded; and the antenna signal receiving module is connected with a BT-TRX pin of the main chip.
The radio frequency processing module is used for receiving the radio frequency signal after the primary processing of the main chip, modulating the radio frequency signal and then sending the radio frequency signal back to the main chip;
the clock oscillation circuit is used for oscillating, timing and generating a time signal and transmitting the time signal to the main chip in real time; the clock oscillation circuit comprises a crystal oscillator, a first crystal oscillator output pin and a second crystal oscillator output pin are arranged on the main chip, the first crystal oscillator output pin is connected with one end connected with the crystal oscillator, the second crystal oscillator output pin is connected with the other end connected with the crystal oscillator, and the crystal oscillator is grounded; the pins of the clock oscillation circuit connected with the main chip are a first crystal oscillator output pin (XO-P pin) and a second crystal oscillator output pin (XO-N pin).
The system power supply module is used for supplying power to the main chip; the system power supply module comprises a transient voltage suppression diode T3 and a power supply, wherein the power supply is connected with the main chip, one end of the transient voltage suppression diode T3 is connected to a circuit between the power supply and the main chip, and the other end of the transient voltage suppression diode T3 is grounded; the system power supply module is connected with a PBINT pin of the main chip, and a PRODT pin of the main chip is grounded.
The USB data receiving module is used for receiving an external data signal and sending the data signal to the main chip; the USB data receiving module comprises a data positive signal end, a data negative signal end, a resistor R9 and a resistor R10, wherein one end of the resistor R9 is connected with the main chip, the other end of the resistor R9 is connected with the data positive signal end, one end of the resistor R10 is connected with the main chip, and the other end of the resistor R10 is connected with the data negative signal end; the data receiving module is connected with a USB-DP pin and a USB-DM pin of the main chip.
The audio processing module is used for receiving a sound signal of external sound equipment, filtering the sound signal and sending the sound signal to the main chip; the audio processing module comprises a capacitor C11 and a sound input end, wherein the sound input end is connected with the main chip, one end of the capacitor C11 is connected to a line between the sound input end and the main chip, and the other end of the capacitor C11 is grounded.
The radio frequency processing module comprises a radio frequency transceiver which is respectively connected with a frequency selection network, an isolation circuit, an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, wherein,
the frequency selection network receives signals sent by an external mobile phone and screens out useful frequency band signals to be transmitted to the frequency transceiver; the frequency selection network comprises an inductor L103 and an inductor L8 which are connected in series, the other end of the inductor L103, which is connected with the end of the inductor L8, is connected with the radio frequency transceiver module, the other end of the inductor L8, which is connected with the end of the inductor L103, is connected with the mobile phone antenna, a grounding capacitor C2 is connected on a line between the inductor L103 and the inductor L8, and a grounding capacitor C1 is arranged on a line between the inductor L8 and the mobile phone antenna.
The isolation circuit receives the high-frequency band signal and the low-frequency band signal which are primarily processed by the main chip, performs filtering processing, and then sends the high-frequency band signal and the low-frequency band signal to the radio frequency transceiver; the isolation circuit comprises a capacitor C59, a capacitor C60, a capacitor C61, a capacitor C62, a capacitor C120, a capacitor C109, a resistor R26 and a resistor R27, wherein the capacitor C120 is connected with the resistor R27 in series, the other end of the capacitor C120, which is opposite to the end connected with the resistor R27, is used as a high-frequency waveband signal input end, and the other end of the resistor R27, which is opposite to the end connected with the capacitor C120, is connected with the radio frequency transceiving module; one end of the capacitor C62 is connected to a line between the capacitor C120 and the resistor R27, the other end of the capacitor C62 is grounded, one end of the capacitor C61 is connected to a line between the resistor R27 and the radio frequency transceiver module, and the other end of the capacitor C61 is grounded; the capacitor C109 is connected with the resistor R26 in series, the other end of the capacitor C109, which is opposite to the end connected with the resistor R26, is used as a low-frequency waveband signal input end, and the other end of the resistor R26, which is opposite to the end connected with the capacitor C109, is connected with the radio frequency transceiving module; one end of the capacitor C60 is connected to the line between the capacitor C109 and the resistor R26, and the other end thereof is grounded, and one end of the capacitor C59 is connected to the line between the resistor R26 and the rf transceiver module, and the other end thereof is grounded.
The 1800/1900MHz mode conversion circuit receives 1800/1900MHz signals sent by the radio frequency transceiver, converts the signals into high-frequency differential signals and then sends the converted high-frequency differential signals to the main chip; the 1800/1900MHz mode conversion circuit comprises a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C66, a capacitor C67, an inductor L4, an inductor L7 and an inductor L108, wherein two ends of the capacitor C67 are respectively connected with the inductor L108 and the radio frequency transceiver module, the other end of the inductor L108, which is opposite to the end connected with the capacitor C67, is used as a first high-frequency output end, one end of the capacitor C4 is connected with one end of the inductor L108, which is used as a first high-frequency waveband signal output end, the other end of the capacitor C67 is grounded, a circuit connected with the inductor L108 is provided with a first node, one end of the capacitor C8 is connected with the first node, the other end of the capacitor C66 is used as a second high-frequency output end, one end of the capacitor; the inductor L7 is connected with the capacitor C6 in series, the other end of the inductor L7, which is opposite to the end connected with the capacitor C6, is connected with one end of the capacitor C8, which serves as a second high-frequency wave band signal output end, and the other end of the capacitor C6 is grounded; the capacitor C7 is connected in series with the inductor L4, the other end of the capacitor C7 opposite to the end connected with the inductor L4 is connected to a line between the capacitor C67 and the radio frequency transceiver module, and the other end of the inductor L4 opposite to the end connected with the capacitor C7 is grounded.
The 850/900MHz mode conversion circuit receives 850/900MHz signals sent out from the radio frequency transceiver, converts the signals into low-frequency differential signals, and then sends the converted low-frequency differential signals to the main chip; the 850/900MHz mode converting circuit includes a capacitor C105, a capacitor C63, a capacitor C65, a capacitor C129, a capacitor C5, a capacitor C64, an inductor L10, an inductor L3, and an inductor L2, wherein two ends of the capacitor C64 are respectively connected to the inductor L2 and the radio frequency transceiver module, the other end of the inductor L2 opposite to the end of the capacitor C64 is used as a first low frequency output end, one end of the capacitor C105 is connected to one end of the inductor L2 which is used as a first low frequency band signal output end, the other end of the capacitor C64 is grounded, a second node is arranged on a line connecting the capacitor C2 and the inductor L2, one end of the capacitor C129 is connected to the second node, the other end of the capacitor C129 is used as a second low frequency output end, one end of the capacitor C5 is; the inductor L3 is connected in series with the capacitor C63, the other end of the inductor L3, which is opposite to the end connected with the capacitor C63, is connected with one end of the capacitor C129 serving as a second low-frequency waveband signal output end, and the other end of the capacitor C63 is grounded; the capacitor C65 is connected in series with the inductor L10, the other end of the capacitor C65 opposite to the end connected with the inductor L10 is connected to a line between the capacitor C64 and the radio frequency transceiver module, and the other end of the inductor L10 opposite to the end connected with the capacitor C65 is grounded.
The radio frequency transceiver receives the high-frequency band signal and the low-frequency band signal which are processed by the isolation circuit, carries out carrier modulation and power amplification on the high-frequency band signal and the low-frequency band signal, and transmits the processed signals out of the radio frequency transceiver; receiving a frequency-selecting network signal, performing frequency selection, frequency reduction, demodulation and preliminary signal reduction processing on the signal, respectively sending the processed signal to an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, converting the signal into a high-frequency differential signal through the 1800/1900MHz mode conversion circuit, sending the high-frequency differential signal to a main chip, converting the signal into a low-frequency differential signal through the 850/900MHz mode conversion circuit, and sending the low-frequency differential signal to the main chip;
the radio frequency transceiver is also connected with a resistor R104, the other end of the resistor R104, which is opposite to the end connected with the radio frequency transceiver, is connected to a base station signal receiving end of the main chip, and a grounding capacitor C121 is also arranged on a line between the resistor R104 and the radio frequency transceiver; the radio frequency transceiver is also connected with a control signal receiving end, and the control signal receiving end receives the control signal of the main chip and sends the control signal to the radio frequency transceiver; the radio frequency transceiver is also connected with a power supply, and a grounding capacitor C107 and a grounding capacitor C108 are also arranged between the power supply and the radio frequency transceiver.
The control signal receiving end comprises a PA-EN connection point, a first control signal input end and a second control signal input end, the PA-EN connection point is connected with the radio frequency transceiving module, and a grounding capacitor C56 is arranged on a circuit between the PA-EN connection point and the radio frequency transceiving module; the first control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C57 is arranged on a line between the first control signal input end and the radio frequency transceiving module; the second control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C58 is arranged on a line between the second control signal input end and the radio frequency transceiving module.
In the embodiment, the main chip end of the mobile phone, to which the first high-frequency band signal HB-RX N, the second high-frequency band signal HB-RX P, the first low-frequency band signal LB-RX N and the second low-frequency band signal LB-RX P are input, adopts a mobile phone chip capable of receiving such signals in the prior art, and the high-frequency band signal HB-TX, the low-frequency band signal LB-TX, the first control signal CTR-BS1 and the second control signal CTR-BS2 are derived from the same main chip of the mobile phone.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A radio frequency processing circuit for a functional mobile phone is characterized by comprising a main chip, wherein the main chip is respectively connected with an antenna signal receiving module, a radio frequency processing module, a clock oscillation circuit, a system power supply module, a USB data receiving module and an audio processing module,
the antenna signal receiving module is used for receiving the antenna signal, filtering and sending the antenna signal to the main chip;
the radio frequency processing module is used for receiving the radio frequency signal after the primary processing of the main chip, modulating the radio frequency signal and then sending the radio frequency signal back to the main chip;
the clock oscillation circuit is used for oscillating, timing and generating a time signal and transmitting the time signal to the main chip in real time;
the system power supply module is used for supplying power to the main chip;
the USB data receiving module is used for receiving an external data signal and sending the data signal to the main chip;
the audio processing module is used for receiving a sound signal of external sound equipment, filtering the sound signal and sending the sound signal to the main chip;
the radio frequency processing module comprises a radio frequency transceiver which is respectively connected with a frequency selection network, an isolation circuit, an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, wherein,
the frequency selection network receives signals sent by an external mobile phone and screens out useful frequency band signals to be transmitted to the frequency transceiver;
the isolation circuit receives the high-frequency band signal and the low-frequency band signal which are primarily processed by the main chip, performs filtering processing, and then sends the high-frequency band signal and the low-frequency band signal to the radio frequency transceiver;
the 1800/1900MHz mode conversion circuit receives 1800/1900MHz signals sent by the radio frequency transceiver, converts the signals into high-frequency differential signals and then sends the converted high-frequency differential signals to the main chip;
the 850/900MHz mode conversion circuit receives 850/900MHz signals sent out from the radio frequency transceiver, converts the signals into low-frequency differential signals, and then sends the converted low-frequency differential signals to the main chip;
the radio frequency transceiver receives the high-frequency band signal and the low-frequency band signal which are processed by the isolation circuit, carries out carrier modulation and power amplification on the high-frequency band signal and the low-frequency band signal, and transmits the processed signals out of the radio frequency transceiver; receiving a frequency-selecting network signal, performing frequency selection, frequency reduction, demodulation and preliminary signal reduction processing on the signal, respectively sending the processed signal to an 1800/1900MHz mode conversion circuit and a 850/900MHz mode conversion circuit, converting the signal into a high-frequency differential signal through the 1800/1900MHz mode conversion circuit, sending the high-frequency differential signal to a main chip, converting the signal into a low-frequency differential signal through the 850/900MHz mode conversion circuit, and sending the low-frequency differential signal to the main chip;
the radio frequency transceiver is also connected with a resistor R104, the other end of the resistor R104, which is opposite to the end connected with the radio frequency transceiver, is connected to a base station signal receiving end of the main chip, and a grounding capacitor C121 is also arranged on a line between the resistor R104 and the radio frequency transceiver; the radio frequency transceiver is also connected with a control signal receiving end, and the control signal receiving end receives the control signal of the main chip and sends the control signal to the radio frequency transceiver; the radio frequency transceiver is also connected with a power supply, and a grounding capacitor C107 and a grounding capacitor C108 are also arranged between the power supply and the radio frequency transceiver.
2. The rf processing circuit of claim 1, wherein the 1800/1900MHz mode converting circuit comprises a capacitor C4, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C66, a capacitor C67, an inductor L4, an inductor L7, and an inductor L108, two ends of the capacitor C67 are respectively connected to the inductor L108 and the rf transceiver module, the other end of the inductor L108 opposite to the end of the capacitor C67 is used as a first high frequency output end, one end of the capacitor C4 is connected to one end of the inductor L108 which is used as a first high frequency band signal output end, the other end of the capacitor C4 is grounded, a first node is provided on a line connecting the capacitor C67 and the inductor L108, one end of the capacitor C8 is connected to the first node, the other end of the capacitor C8 is used as a second high frequency output end, one end of the capacitor C66 is connected to the first node, and the other end of the capacitor; the inductor L7 is connected with the capacitor C6 in series, the other end of the inductor L7, which is opposite to the end connected with the capacitor C6, is connected with one end of the capacitor C8, which serves as a second high-frequency wave band signal output end, and the other end of the capacitor C6 is grounded; the capacitor C7 is connected in series with the inductor L4, the other end of the capacitor C7 opposite to the end connected with the inductor L4 is connected to a line between the capacitor C67 and the radio frequency transceiver module, and the other end of the inductor L4 opposite to the end connected with the capacitor C7 is grounded.
3. The rf processing circuit of claim 1, wherein the 850/900MHz mode converting circuit comprises a capacitor C105, a capacitor C63, a capacitor C65, a capacitor C129, a capacitor C5, a capacitor C64, an inductor L10, an inductor L3, and an inductor L2, two ends of the capacitor C64 are respectively connected to the inductor L2 and the rf transceiver module, the other end of the inductor L2 opposite to the end of the capacitor C64 is used as a first low frequency output end, one end of the capacitor C105 is connected to one end of the inductor L2 which is used as a first low frequency band signal output end, the other end of the capacitor C64 is grounded, a second node is provided on a line connecting the capacitor C64 and the inductor L2, one end of the capacitor C129 is connected to the second node, the other end of the capacitor C129 is used as a second low frequency output end, one end of the capacitor C5 is connected to the second node, and the other end of the capacitor; the inductor L3 is connected in series with the capacitor C63, the other end of the inductor L3, which is opposite to the end connected with the capacitor C63, is connected with one end of the capacitor C129 serving as a second low-frequency waveband signal output end, and the other end of the capacitor C63 is grounded; the capacitor C65 is connected in series with the inductor L10, the other end of the capacitor C65 opposite to the end connected with the inductor L10 is connected to a line between the capacitor C64 and the radio frequency transceiver module, and the other end of the inductor L10 opposite to the end connected with the capacitor C65 is grounded.
4. The radio frequency processing circuit for the functional mobile phone as claimed in claim 1, wherein the isolation circuit comprises a capacitor C59, a capacitor C60, a capacitor C61, a capacitor C62, a capacitor C120, a capacitor C109, a resistor R26 and a resistor R27, the capacitor C120 and the resistor R27 are connected in series, the other end of the capacitor C120 opposite to the end connected with the resistor R27 serves as a high frequency band signal input end, and the other end of the resistor R27 opposite to the end connected with the capacitor C120 is connected with the radio frequency transceiving module; one end of the capacitor C62 is connected to a line between the capacitor C120 and the resistor R27, the other end of the capacitor C62 is grounded, one end of the capacitor C61 is connected to a line between the resistor R27 and the radio frequency transceiver module, and the other end of the capacitor C61 is grounded; the capacitor C109 is connected with the resistor R26 in series, the other end of the capacitor C109, which is opposite to the end connected with the resistor R26, is used as a low-frequency waveband signal input end, and the other end of the resistor R26, which is opposite to the end connected with the capacitor C109, is connected with the radio frequency transceiving module; one end of the capacitor C60 is connected to the line between the capacitor C109 and the resistor R26, and the other end thereof is grounded, and one end of the capacitor C59 is connected to the line between the resistor R26 and the rf transceiver module, and the other end thereof is grounded.
5. The rf processing circuit of claim 1, wherein the control signal receiving terminal comprises a PA-EN connection point, a first control signal input terminal, and a second control signal input terminal, the PA-EN connection point is connected to the rf transceiving module, and a ground capacitor C56 is disposed on a line between the PA-EN connection point and the rf transceiving module; the first control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C57 is arranged on a line between the first control signal input end and the radio frequency transceiving module; the second control signal input end is connected with the radio frequency transceiving module, and a grounding capacitor C58 is arranged on a line between the second control signal input end and the radio frequency transceiving module.
6. The radio frequency processing circuit for functional mobile phones according to claim 1, wherein the frequency-selective network comprises an inductor L103 and an inductor L8 connected in series, the other end of the inductor L103 connected to an end of the inductor L8 is connected to the radio frequency transceiver module, the other end of the inductor L8 connected to an end of the inductor L103 is connected to the mobile phone antenna, a ground capacitor C2 is connected to a line between the inductor L103 and the inductor L8, and a ground capacitor C1 is connected to a line between the inductor L8 and the mobile phone antenna.
7. The radio frequency processing circuit for the functional mobile phone as claimed in claim 1, wherein the antenna signal receiving module comprises an inductor L1, a capacitor C24, a capacitor C77 and an antenna, the inductor L1 is connected in series with the antenna, the other end of the inductor L1 opposite to the end connected to the antenna is connected to the main chip, one end of the capacitor C24 is connected to a line between the inductor L1 and the main chip, the other end of the capacitor C24 is grounded, one end of the capacitor C77 is connected to a line between the inductor L1 and the antenna, and the other end of the capacitor C77 is grounded.
8. The rf processing circuit of claim 1, wherein the clock oscillator circuit comprises a crystal oscillator, the main chip is provided with a first crystal oscillator output pin and a second crystal oscillator output pin, the first crystal oscillator output pin is connected to one end of the crystal oscillator, the second crystal oscillator output pin is connected to the other end of the crystal oscillator, and the crystal oscillator is grounded.
9. The RF processing circuit of claim 1, wherein the system power supply module comprises a transient voltage suppressor T3 and a power supply, the power supply is connected to the main chip, one end of the transient voltage suppressor T3 is connected to a line between the power supply and the main chip, and the other end of the transient voltage suppressor T3 is grounded; the audio processing module comprises a capacitor C11 and a sound input end, wherein the sound input end is connected with the main chip, one end of the capacitor C11 is connected to a line between the sound input end and the main chip, and the other end of the capacitor C11 is grounded.
10. The RF processing circuit of claim 1, wherein the USB data receiving module comprises a positive data signal terminal, a negative data signal terminal, a resistor R9 and a resistor R10, the resistor R9 is connected to the main chip at one end and the positive data signal terminal at the other end, and the resistor R10 is connected to the main chip at one end and the negative data signal terminal at the other end.
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|---|---|---|---|
| CN202020599083.1U CN211406018U (en) | 2020-04-20 | 2020-04-20 | Radio frequency processing circuit for functional mobile phone |
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| CN202020599083.1U CN211406018U (en) | 2020-04-20 | 2020-04-20 | Radio frequency processing circuit for functional mobile phone |
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