CN108880594A - The radio frequency transceiver of crystal oscillator outside a kind of no piece - Google Patents
The radio frequency transceiver of crystal oscillator outside a kind of no piece Download PDFInfo
- Publication number
- CN108880594A CN108880594A CN201810557109.3A CN201810557109A CN108880594A CN 108880594 A CN108880594 A CN 108880594A CN 201810557109 A CN201810557109 A CN 201810557109A CN 108880594 A CN108880594 A CN 108880594A
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- Prior art keywords
- piece
- resistance
- radio frequency
- crystal oscillator
- frequency transceiver
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Transceivers (AREA)
Abstract
The invention discloses a kind of radio frequency transceivers of crystal oscillator outside no piece, it is related to radio frequency transceiver field, including transmission antenna outside receiving antenna outside piece, piece, receives RX low noise circuit, sends TX power amplifier, receiving filter, transmitting digital analog converter, demodulator, modulator, digital baseband block, power management module and RC clapp oscillator, wherein, the RC clapp oscillator generates clock signal and provides reference frequency signal.The present invention has the on piece crystal-oscillator circuit of adjustable condenser frequency compensation and resistor network temperature-compensating, constitutes a kind of radio frequency transceiver structure of crystal oscillator outside no piece.The present invention has the advantages that use that is relatively simple for structure, saving cost, avoid I/O PIN foot.
Description
Technical field
The present invention relates to a kind of radio frequency transceivers of crystal oscillator outside radio frequency transceiver field more particularly to no piece.
Background technique
It mainly include radio frequency receiving and transmitting front end, power management module, voltage controlled oscillator in traditional radio frequency transceiver structure
(VCO) module, the outer dual-mode antenna of piece, the outer crystal oscillator of piece.In these modules, the outer frequency reference crystal oscillator of piece is most
Hardly possible is integrated in the chips, to hinder the miniaturization of rf chip and cost effective.
The advantages of this structure is：1, frequency stability is high, and temperature drift is smaller；2, it mutually makes an uproar low；
Its major defect is：1, it is at high cost to increase circuit design；2, chip package pin is occupied.
Therefore, those skilled in the art is dedicated to developing a kind of radio frequency transceiver of crystal oscillator outside no piece, primarily to
It solves two problems：
1, common frequency reference crystal oscillator generally uses quartz crystal oscillator, it provides good stability and PVT characteristic.So
And its volume will not be reduced with manufacturing process or frequency, and can not be compatible with conventional process chip processing procedure and encapsulation.
2, it needs to occupy limited encapsulation PIN foot using crystal oscillator outside piece, reduces the quantity of other I/O PIN, increase simultaneously
Add cost, in order to solve this problem just needs to avoid the use of the outer crystal oscillator of piece, a kind of radio-frequency receiving-transmitting function of on piece crystal oscillator
Circuit cost is enough reduced, chip has more I/O PIN foot.
Summary of the invention
In view of the above drawbacks of the prior art, the technical problem to be solved by the present invention is in order to avoid crystal vibration outside piece
It swings device bring cost and occupies packaging pin problem, while the problem for avoiding on piece RC oscillator larger with temperature drift.
To achieve the above object, the present invention provides receive day outside a kind of radio frequency transceiver of crystal oscillator outside no piece, including piece
The outer transmission antenna of line, piece receives RX low noise circuit, sends TX power amplifier, receiving filter, transmitting digital analog converter, solution
Device, modulator, digital baseband block, power management module and RC clapp oscillator are adjusted, described outer receiving antenna receives signal
The reception RX low noise circuit is accessed, then accesses the demodulator through the receiving filter, the demodulator output
Signal is exported after the digital baseband block to the modulator, and the modulator output signal accesses the transmitting digital-to-analogue
Described outer transmission antenna is sent the signal to using the transmission TX power amplifier after converter, wherein the RC oscillation
Generator generates clock signal and provides reference frequency signal.
Further, the RC clapp oscillator includes RC network, single-ended reverse phase hysteresis comparator and output module, described
RC network output end accesses the single-ended reverse phase hysteresis comparator input terminal, and the single-ended reverse phase hysteresis comparator output is connected to
The output module, the single-ended reverse phase hysteresis comparator output end are connected to the RC network input terminal simultaneously.
Further, the RC network includes resistance R1 and resistance R2, and capacitor C2 and the one end capacitor C, the resistance R1 are
The RC network input terminal, the resistance R1 other end are connected with the capacitor C and the capacitor C2, the capacitor C2 other end
Ground connection, the other end of the capacitor C are connected with resistance R2, the other end ground connection of the resistance R2.
Further, the capacitor C2 is adjustable.
Further, the temperature coefficient of the resistance R1 and resistance R2 is different.
Further, the single-ended reverse phase hysteresis comparator includes resistance R3, resistance R4, phase inverter 1, phase inverter 2 and anti-
Phase device 3, the one end the resistance R3 are the input terminal of the single-ended hysteresis comparator, the resistance R3 it is another be connected to it is described anti-
1 input terminal of phase device, the output of phase inverter 1 are connected to 2 input terminal of phase inverter, and the output of phase inverter 2 is connected to described
Phase inverter 3, an end of the resistance R4 are connected to 2 output end of phase inverter, and the another of the resistance R4 is connected to the reverse phase
The input terminal of device 1.
Further, the output module includes two concatenated phase inverters.
Further, the RC clapp oscillator is in piece.
Further, the RC clapp oscillator has voltage detection circuit.
Further, the RC clapp oscillator has temperature-compensation circuit.
In better embodiment of the invention, one kind is devised simultaneous with adjustable condenser frequency compensation and resistance net
The on piece crystal-oscillator circuit of network temperature-compensating constitutes a kind of radio frequency transceiver structure of crystal oscillator outside no piece.Tool
Have it is relatively simple for structure, save cost, avoid the advantages of use of I/O PIN foot.
In another better embodiment of the invention, adjustable electric is passed through using the relaxor structure of on piece RC network
The RC network of appearance and resistance R1, R2 network with temperature-compensating ensure oscillator in certain temperature range frequency it is steady
It is fixed, the frequency reference requirement that enough frequency accuracies meet radio frequency transceiver is provided.
The process deviation influence of the different chips of RC clapp oscillator is to complete precision alignment in chip calibration phase.Temperature
Degree correction is realized by temperature-compensation circuit.Different power voltage influence is compensated again by voltage detection circuit
Come what is realized.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is a kind of radio-frequency transceiver system structure chart of outer crystal oscillator of traditional piece；
Fig. 2 is the system construction drawing of the radio frequency transceiver of crystal oscillator outside a kind of no piece of a preferred embodiment of the invention；
Fig. 3 is the RC clapp oscillator of the radio frequency transceiver of crystal oscillator outside a kind of no piece of a preferred embodiment of the invention
Circuit diagram；
Fig. 4 is that the sluggishness that has of the radio frequency transceiver of crystal oscillator outside a kind of no piece of a preferred embodiment of the invention compares
The RC network clapp oscillator schematic diagram of device structure.
Specific embodiment
Multiple preferred embodiments of the invention are introduced below with reference to Figure of description, keep its technology contents more clear and just
In understanding.The present invention can be emerged from by many various forms of embodiments, and protection scope of the present invention not only limits
The embodiment that Yu Wenzhong is mentioned.
In the accompanying drawings, the identical component of structure is indicated with same numbers label, everywhere the similar component of structure or function with
Like numeral label indicates.The size and thickness of each component shown in the drawings are to be arbitrarily shown, and there is no limit by the present invention
The size and thickness of each component.Apparent in order to make to illustrate, some places suitably exaggerate the thickness of component in attached drawing.
It mainly include radio frequency receiving and transmitting front end as shown in Figure 1, being the radio-frequency transceiver system structure chart of the outer crystal oscillator of traditional piece,
Power management module, voltage controlled oscillator (VCO) module, the outer dual-mode antenna of piece, the outer crystal oscillator of piece.This structure it is worked
Cheng Shi：The clapp oscillator module of chip interior is connected to using crystal oscillator integrated outside piece, clapp oscillator module produces
A raw pumping signal makes the outer crystal oscillator occurrence frequency oscillation of piece, in entire receive-transmit system for voltage controlled oscillator or
Data processing module generates clock signal and provides reference frequency signal for particular system.In these modules, the outer frequency ginseng of piece
Examine crystal oscillator be most difficult to it is integrated in the chips, to hinder the miniaturization of rf chip and cost effective.
As shown in Fig. 2, be the radio-frequency transceiver system figure of crystal oscillator outside a kind of no piece provided by the invention, it mainly will be outside piece
Crystal oscillator is done by the relaxor of RC network to piece, and a kind of radio frequency transceiver structure of crystal oscillator outside no piece is formed,
Including receive RX low noise circuit, send TX power amplifier, receiving filter, transmitting digital analog converter, demodulator, modulator,
Digital baseband block, power management module and RC clapp oscillator.Receiving antenna RX_ANT receives signal access and receives RX low noise
Electric discharge road, then received filter accesses demodulator, and the signal of demodulator output is exported after digital baseband block to tune
Device processed, modulator output signal access after transmitting digital analog converter and send the signal to transmission day using transmission TX power amplifier
Line TX_ANT.Wherein, the RC clapp oscillator generates clock signal and provides reference frequency signal.
As shown in figure 3, being the internal structure chart of RC network relaxation oscillator, relaxation vibration is constituted with temperature-compensating RC network
The primary structure for swinging generator is：Adjustable RC network, adjustable capacitor are able to carry out one-time process calibration to adjust vibration
Swing the frequency of device, it is ensured that the stabilization of frequency has biggish load shadow using the tunable capacitor of appropriate value to avoid to capacitor C
It rings.
As shown in figure 4, being the RC network relaxor schematic diagram with hysteresis comparator structure, there is switching threshold electricity
Press VHAnd VLReverse phase hysteresis comparator can define the charge and discharge level of RC network.Single-ended hysteresis comparator is by two reverse phases
Device stacks, by the way that in the resistance feedback structure of R3 and R4, one feedback resistance high-gain with sluggish level of composition is put
Big device.The phase inverter stacked simultaneously can reduce leakage current in dormant state.
RC network forms transfer function：
One zero point (- 1/R is increased due to the addition of R2 compared to traditional relaxor2C), R1 and R2 is not using
The resistance of synthermal coefficient provides a kind of temperature-compensating.Output is triggered as a kind of rail-to-rail hysteresis comparator, RC network
Output signal triggers the step response of hysteresis comparator, and this step response is divided into two stages：Instantaneous step stage and index
Decling phase, this and the single RC step response difference occurred in traditional relaxor.The initial step rank of output response
Duan Wei：In T=0, step signal cannot change moment to capacitor C, the voltage at the both ends capacitor C is reached, therefore top crown and lower pole
The voltage of plate rises together, and the initial-value theorem of at this moment Laplace transform is applied in transmission function, if input step signal
With normalized unit amplitude, can further calculate initial step amplitude is：R2/(R1+R2), due to two resistance of R1, R2
Temperature coefficient it is different, the amplitude that can result in initial step increases with the raising of temperature.However, the time constant of index section
Also increase with temperature, offset the influence of initial step, and generate constant time T, thus trigger switch threshold value VH, to protect
It has demonstrate,proved whole cycle to remain unchanged, it is ensured that the stabilization of frequency.By selecting identical temperature coefficient from different temperatures coefficient
But different size of resistance constitutes RC network, so that so that step response rank end and exponential damping is cancelled out each other reduces temperature to relaxation
Oscillator frequency influences.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (10)
1. the radio frequency transceiver of crystal oscillator outside a kind of no piece, which is characterized in that including transmission antenna outside receiving antenna outside piece, piece, connect
It receives RX low noise circuit, send TX power amplifier, receiving filter, transmitting digital analog converter, demodulator, modulator, digital base
Band module, power management module and RC clapp oscillator, described outer receiving antenna receive signal and access the reception RX low noise
Then the demodulator is accessed through the receiving filter in electric discharge road, the signal of the demodulator output is by the digital base
Output to the modulator, the modulator output signal accesses after the transmitting digital analog converter using described after band module
It sends TX power amplifier and sends the signal to described outer transmission antenna.
2. the radio frequency transceiver as described in claim 1 without crystal oscillator outside piece, which is characterized in that the RC clapp oscillator includes
RC network, single-ended reverse phase hysteresis comparator and output module, the RC network output end access the single-ended reverse phase sluggishness and compare
Device input terminal, the single-ended reverse phase hysteresis comparator output are connected to the output module, the single-ended reverse phase hysteresis comparator
Output end is connected to the RC network input terminal simultaneously.
3. the radio frequency transceiver as claimed in claim 2 without crystal oscillator outside piece, the RC network includes resistance R1 and resistance R2, electricity
Hold C2 and capacitor C, the one end the resistance R1 is the RC network input terminal, the resistance R1 other end and the capacitor C and institute
It states capacitor C2 to be connected, the capacitor C2 other end ground connection, the other end of the capacitor C is connected with resistance R2, the resistance R2's
Other end ground connection.
4. the radio frequency transceiver as claimed in claim 3 without crystal oscillator outside piece, the capacitor C2 is adjustable.
5. the radio frequency transceiver as claimed in claim 3 without crystal oscillator outside piece, the temperature system of the resistance R1 and the resistance R2
Number is different.
6. the radio frequency transceiver as claimed in claim 2 without crystal oscillator outside piece, the single-ended reverse phase hysteresis comparator includes resistance
R3, resistance R4, phase inverter 1, phase inverter 2 and phase inverter 3, the one end the resistance R3 are the input of the single-ended hysteresis comparator
End, the another of the resistance R3 are connected to 1 input terminal of phase inverter, and it is defeated that the output of phase inverter 1 is connected to the phase inverter 2
Entering end, the output of phase inverter 2 is connected to the phase inverter 3, and an end of the resistance R4 is connected to 2 output end of phase inverter,
Another input terminal for being connected to the phase inverter 1 of the resistance R4.
7. the radio frequency transceiver as claimed in claim 2 without crystal oscillator outside piece, the output module includes two concatenated reverse phases
Device.
8. the radio frequency transceiver as described in claim 1 without crystal oscillator outside piece, the RC clapp oscillator is in piece.
9. the radio frequency transceiver as described in claim 1 without crystal oscillator outside piece, the RC clapp oscillator is examined with supply voltage
Slowdown monitoring circuit.
10. the radio frequency transceiver as described in claim 1 without crystal oscillator outside piece, the RC clapp oscillator has temperature-compensating electricity
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810557109.3A CN108880594B (en) | 2018-06-01 | 2018-06-01 | Radio frequency transceiver of no off-chip crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810557109.3A CN108880594B (en) | 2018-06-01 | 2018-06-01 | Radio frequency transceiver of no off-chip crystal oscillator |
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| Publication Number | Publication Date |
|---|---|
| CN108880594A true CN108880594A (en) | 2018-11-23 |
| CN108880594B CN108880594B (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810557109.3A Active CN108880594B (en) | 2018-06-01 | 2018-06-01 | Radio frequency transceiver of no off-chip crystal oscillator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714024A (en) * | 2018-12-26 | 2019-05-03 | 湘潭芯力特电子科技有限公司 | A kind of CMOS relaxation oscillator circuit of temperature-compensating |
| CN110289812A (en) * | 2019-06-28 | 2019-09-27 | Oppo广东移动通信有限公司 | Method, apparatus, electronic equipment and the storage medium of crystal oscillator frequency compensation |
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| CN107040210A (en) * | 2017-05-31 | 2017-08-11 | 广东工业大学 | A kind of RC oscillators and DC D/C power chip |
| CN107222186A (en) * | 2017-05-05 | 2017-09-29 | 西北工业大学 | RC relaxors without comparator |
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| US20040152427A1 (en) * | 2003-01-30 | 2004-08-05 | Yen-Chang Chiu | Single crystal oscillator RF transmitter system |
| US20050190828A1 (en) * | 2004-02-27 | 2005-09-01 | International Business Machines Corporation | System and method for detecting cable faults for high-speed transmission link |
| US20060274681A1 (en) * | 2005-06-02 | 2006-12-07 | International Business Machines Corporation | Apparatus and method for reduced loading of signal transmission elements |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714024A (en) * | 2018-12-26 | 2019-05-03 | 湘潭芯力特电子科技有限公司 | A kind of CMOS relaxation oscillator circuit of temperature-compensating |
| CN110289812A (en) * | 2019-06-28 | 2019-09-27 | Oppo广东移动通信有限公司 | Method, apparatus, electronic equipment and the storage medium of crystal oscillator frequency compensation |
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| Publication number | Publication date |
|---|---|
| CN108880594B (en) | 2021-03-30 |
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