CN100559783C - Wireless RF transmitter and controller - Google Patents
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- CN100559783C CN100559783C CNB2005100701799A CN200510070179A CN100559783C CN 100559783 C CN100559783 C CN 100559783C CN B2005100701799 A CNB2005100701799 A CN B2005100701799A CN 200510070179 A CN200510070179 A CN 200510070179A CN 100559783 C CN100559783 C CN 100559783C
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Abstract
The invention provides a kind of Wireless RF transmitter and controller, this Wireless RF transmitter comprises an oscillator, in order to a stable frequency of oscillation to be provided; One modulating capacitor is series at the output or the input of this oscillator, in order to modulate this frequency of oscillation; One transistor is connected between this modulating capacitor and the earth terminal, is subjected to the control of a numerical data and conducting or close; One radio-frequency power amplifier is electrically connected on this oscillator, receives this frequency of oscillation, and produces an energy according to the transmit power needs of setting; And a transmitting antenna, be electrically connected on this radio-frequency power amplifier, receive this energy, and launch a modulated carrier signal.The present invention not only provides a simple and easy less radio-frequency FSK emitter and a mission controller, can significantly reduce the complexity of FSK numeral modulation system and the feasibility of realization, also significantly reduces whole cost.
Description
Technical field
The present invention relates to a kind of Wireless RF transmitter and controller, refer to a kind of less radio-frequency frequency displacement keying method emitter and controller especially.
Background technology
The frequency modulating mode of known communication system, or use analog frequency modulation (frequencymodulation, FM) pattern, or frequency displacement keying method (frequency-shift keying, FSK) pattern, its principle all be with the different output frequency of modulation variation as the mode that information transmits, on audio signal modulation tremendously high frequency carrier wave, launch by antenna.
Known FSK communication modulation mode is still prolonged with traditional analog frequency modulation (FM) communication transmission architecture, only is that the input simulated audio signal is changed over the Digital Logic data, and its modulation emitter still prolongs with traditional analog frequency modulation communication transmission architecture.See also Fig. 1, it is the modulation mode of known mixer frequency modulation.As shown in the figure, the fundamental frequency message Fm of the low frequency that tendency to develop is sent, the Fosc signal that local oscillator 12 (local oscillator) by mixer 11 (mixer) and local high frequency is produced carries out the mixing action, low frequency Fm message is carried on the high frequency Fosc signal, behind filter 13 and radio-frequency power amplifier 14, send out via LC transmitting antenna 15 again.Above-mentioned modulation mode is because of being subject to the use of mixer 11 and filter 13 analog circuits such as grade, therefore its application module is comparatively complicated, for designing conveniently, whole system is divided into two big independent blocks at least, therefore, desire integration digital interface and radio-frequency transmissions interface have its certain difficulty in single IC for both.
(phase-locked loop, PLL) the modulation mode as shown in Figure 2 in another common known indirect frequency phase lock loop.As shown in the figure, crystal oscillator 21 provides a stable reference oscillation frequency (Fref) to give phase-locked loop 22, to carry out the locking of characteristic frequency.Wherein the phase comparator 221 in this phase-locked loop 22 is in order to the phase difference of the output frequency (Fin) of this reference oscillation frequency Freq and this phase-locked loop 22 relatively, voltage-controlled oscillator 222 (voltage-controlled oscillator, VCO) the data message (data) sent of coupling tendency to develop, while is according to the result of this phase comparator 221, output one is adjusted control voltage and is controlled this output frequency (Fin), this output frequency is except feeding back to this phase comparator 221 with the locking tranmitting frequency, simultaneously, also launch, to finish the modulation emission of message via radio-frequency power amplifier 23 and LC transmitting antenna 24.
Though the part circuit in the known phase-locked loop is replaced by digital circuit gradually, the phase-locked loop can be according to the synthetic modulated carrier signal of pinning different channel of actual demand, yet, existing voltage-controlled oscillator major part still is an analog processing circuit, therefore, whole FSK modulation circuit still is subject to the use of voltage-controlled oscillator analog circuit, directly integrating digital control interface and radio-frequency transmissions interface on single IC for both, its certain difficulty is arranged still.
Comprise the today in that digitlization prevails such as information processing, format transmission message and information storage mode etc., all adopts the digital processing mode in a large number.Do not relating to that hyperfrequency uses or during special consideration such as message processing, application such as in-plant simple and easy transfer of data or simple and easy wireless remote control only need an easy data communication transmission means, need not use the communication system of a complex and expensive really.With the wireless mouse is example, and it is a simple and unidirectional data transfer of data, if use complicated and expensive integrated circuit or external module, will undermine the degree of its universalness.
See also Fig. 3, it is the modulation mode that well known frequencies is switched frequency modulation.As shown in the figure, the digital communications of the low frequency that it send tendency to develop, Digital Logic " 0 " with " 1 ", select different frequency output by frequency switching selecting circuit 31, send out via radio-frequency power amplifier 32 and LC transmitting antenna 33, the possibility that makes overall architecture be incorporated on the single IC for both increases again, yet it need use two groups of above different high-frequency oscillation signal source supplies at least, disturbing mutually and dependence between two groups of high-frequency signals sources increases the complexity of its Application Design.
Under the total system cost consideration, mixer or phase-locked loop need expensive special analog radio frequency integrated circuit, or need the special discrete component of part and use special consideration, often make us drawing back.Simultaneously, the transceiver circuit that all products all must complex and expensive whether? whether only transmit at simple data, easy wireless transmission service is provided?
Therefore, need to improve the shortcoming of above-mentioned known approaches.
Summary of the invention
The objective of the invention is provides a kind of Wireless RF transmitter and controller for the above-mentioned shortcoming that overcomes prior art, and it is a cheap and easy FSK modulation emission system and a mission controller, with the application category of extended wireless data communication.
For achieving the above object, the invention provides a kind of Wireless RF transmitter, it comprises: an oscillator, its output provide a stable frequency of oscillation; One modulating capacitor, its first end is electrically connected on this output of this oscillator, wherein this Wireless RF transmitter utilizes the switching of conducting-closed condition between second end of this modulating capacitor and this modulating capacitor and the earth terminal, modulates this stable frequency of oscillation; One transistor is connected between this second end and this earth terminal of this modulating capacitor, is subjected to the control of a numerical data and conducting or close, to control this conducting-closed condition; One radio-frequency power amplifier, its input are electrically connected on this output of this oscillator, receive this stable frequency of oscillation, and produce an energy according to the transmit power needs of setting; And a transmitting antenna, be electrically connected on this radio-frequency power amplifier, receive this energy, and launch a modulated carrier signal.
Aforesaid Wireless RF transmitter, this Wireless RF transmitter are less radio-frequency frequency displacement keying method (frequency-shift keying) emitter.
Aforesaid Wireless RF transmitter, this oscillator are a crystal oscillator.
Aforesaid Wireless RF transmitter, this transistor are a N type MOS (metal-oxide-semiconductor) transistor.
Aforesaid Wireless RF transmitter, this modulating capacitor are series between the drain electrode of the output of this oscillator and this N type MOS (metal-oxide-semiconductor) transistor.
Aforesaid Wireless RF transmitter, when this N type MOS (metal-oxide-semiconductor) transistor was closed, the capacitance of this oscillator output end remained unchanged, and this oscillator is exported one first frequency of oscillation.
Aforesaid Wireless RF transmitter, when this N type MOS (metal-oxide-semiconductor) transistor conducting, this modulating capacitor and the electric capacity of this oscillator output end ground connection in parallel, thereby increase the capacitance of this oscillator output end, this oscillator is exported one second frequency of oscillation.
Aforesaid Wireless RF transmitter, the difference (modulation voltage) of this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
For achieving the above object, the present invention provides a kind of less radio-frequency mission controller in addition, and it comprises: an oscillator, its output provide a stable frequency of oscillation; One modulating capacitor, its first end is electrically connected on this output of this oscillator; One microcontroller, be electrically connected on this output of this oscillator, include a radio-frequency power amplifier and a control pin, wherein this control pin is electrically connected on second end of this modulating capacitor, this microprocessor controls should be controlled the conducting-closed condition between a pin and the earth terminal, and this less radio-frequency mission controller utilizes the switching of this modulating capacitor and this conducting-closed condition, modulates this stable frequency of oscillation; And a transmitting antenna, be electrically connected on this microcontroller, in order to launch a modulated carrier signal.
Aforesaid less radio-frequency mission controller, this less radio-frequency mission controller are a less radio-frequency frequency displacement keying method mission controller.
Aforesaid less radio-frequency mission controller, this oscillator are a crystal oscillator.
Aforesaid less radio-frequency mission controller, this control pin are I/O control pin.
Aforesaid less radio-frequency mission controller, when this I/O control pin is an input pattern or when being output as the high impedance operation level, the capacitance of this oscillator output end is constant, this oscillator is exported one first frequency of oscillation.
Aforesaid less radio-frequency mission controller, when this I/O control pin is output mode, if this I/O control pin is output as when hanging down operation level, will increase the capacitance of this oscillator output end, this oscillator is exported one second frequency of oscillation.
Aforesaid less radio-frequency mission controller, this I/O control pin is the output CMOS (CMOS) shared with input.
Aforesaid less radio-frequency mission controller, the difference (modulation voltage) of this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
Aforesaid less radio-frequency mission controller, this radio-frequency power amplifier receives the output frequency of this oscillator output end, and according to the transmit power needs of setting, this modulated carrier signal is gone out by this transmission antennas transmit.
For achieving the above object, the present invention provides a kind of Wireless RF transmitter again, and it comprises: an oscillator, its output provide a stable frequency of oscillation; One modulating capacitor, its first end is electrically connected on the input of this oscillator, wherein this Wireless RF transmitter utilizes the switching of conducting-closed condition between second end of this modulating capacitor and this modulating capacitor and the earth terminal, modulates this stable frequency of oscillation; One transistor is connected between this second end and this earth terminal of this modulating capacitor, is subjected to the control of a numerical data and conducting or close, to control this conducting-closed condition; One radio-frequency power amplifier, its input are electrically connected on this output of this oscillator, receive this stable frequency of oscillation, and produce an energy according to the transmit power needs of setting; And a transmitting antenna, be electrically connected on this radio-frequency power amplifier, receive this energy, and launch a modulated carrier signal.
Aforesaid Wireless RF transmitter, this Wireless RF transmitter are less radio-frequency frequency displacement keying method (frequency-shift keying) emitter.
Aforesaid Wireless RF transmitter, this oscillator are a crystal oscillator.
Aforesaid Wireless RF transmitter, this transistor are a N type MOS (metal-oxide-semiconductor) transistor.
Aforesaid Wireless RF transmitter, this modulating capacitor are series between the drain electrode of the input of this oscillator and this N type MOS (metal-oxide-semiconductor) transistor.
Aforesaid Wireless RF transmitter, when this N type MOS (metal-oxide-semiconductor) transistor was closed, the capacitance of this oscillator input remained unchanged, and this oscillator is exported one first frequency of oscillation.
Aforesaid Wireless RF transmitter, when this N type MOS (metal-oxide-semiconductor) transistor conducting, this modulating capacitor and the electric capacity of this oscillator input ground connection in parallel, thereby increase the capacitance of this oscillator input, this oscillator is exported one second frequency of oscillation.
Aforesaid Wireless RF transmitter, the difference (modulation voltage) of this first frequency of oscillation and this second frequency of oscillation are by this modulating capacitor control.
For achieving the above object, the present invention provides a kind of less radio-frequency mission controller again, and it comprises: an oscillator, its output provide a stable frequency of oscillation; One modulating capacitor, its first end is electrically connected on the input of this oscillator; One microcontroller, be electrically connected on this output of this oscillator, include a radio-frequency power amplifier and a control pin, wherein this control pin is electrically connected on second end of this modulating capacitor, this microprocessor controls should be controlled the conducting-closed condition between a pin and the earth terminal, and this less radio-frequency mission controller utilizes the switching of this modulating capacitor and this conducting-closed condition, modulates this frequency of oscillation; And a transmitting antenna, be electrically connected on this microcontroller, in order to launch a modulated carrier signal.
Aforesaid less radio-frequency mission controller, this less radio-frequency mission controller are a less radio-frequency frequency displacement keying method mission controller.
Aforesaid less radio-frequency mission controller, this oscillator are a crystal oscillator.
Aforesaid less radio-frequency mission controller, this control pin are I/O control pin.
Aforesaid less radio-frequency mission controller, when this I/O control pin is an input pattern or when being output as the high impedance operation level, the capacitance of this oscillator input is constant, this oscillator is exported one first frequency of oscillation.
Aforesaid less radio-frequency mission controller, when this I/O control pin is output mode, if this I/O control pin is output as when hanging down operation level, will increase the capacitance of this oscillator input, this oscillator is exported one second frequency of oscillation.
Aforesaid less radio-frequency mission controller, this I/O control pin is the output CMOS (CMOS) shared with input.
Aforesaid less radio-frequency mission controller, the difference (modulation voltage) of this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
Aforesaid less radio-frequency mission controller, this radio-frequency power amplifier system receives the output frequency of this oscillator output end, and according to the transmit power needs of setting, this modulated carrier signal is gone out by this transmission antennas transmit.
Description of drawings
Fig. 1: the modulation mode of known mixer frequency modulation.
Fig. 2: the modulation mode of known phase-locked loop.
Fig. 3: well known frequencies is switched the modulation mode of frequency modulation.
Fig. 4: the Organization Chart of the FSK modulation circuit of a preferred embodiment of the present invention.
Fig. 5 (a): the Organization Chart of the FSK adjusting controller of a preferred embodiment of the present invention.
Fig. 5 (b): the Organization Chart of the FSK adjusting controller of another preferred embodiment of the present invention.
Fig. 6: the Organization Chart of the FSK modulation circuit of another preferred embodiment of the present invention.
Fig. 7 (a): the Organization Chart of the FSK adjusting controller of the another preferred embodiment of the present invention.
Fig. 7 (b): the present invention is the Organization Chart of the FSK adjusting controller of a preferred embodiment again.
Embodiment
See also Fig. 4, it is the Organization Chart of the FSK modulation circuit of a preferred embodiment of the present invention, and this FSK modulation circuit comprises a crystal oscillator 41, a N type MOS (metal-oxide-semiconductor) transistor 42, a modulating capacitor Cx, a radio-frequency power amplifier 44, reaches a LC transmitting antenna 45.As shown in the figure, the present invention utilizes traditional crystal oscillator 41, cooperate negater circuit INV, feedback resistance R, with electric capacity of voltage regulation C1 and C2, stable first frequency of oscillation output is provided.If change the capacitance of C2, to directly change this first frequency of oscillation output, therefore the present invention is this N type MOS (metal-oxide-semiconductor) transistor 42 of utilizing the CMOS processing procedure, make this modulating capacitor Cx be connected to the tie point of the input of the output OSC2 of this crystal oscillator 41 and this radio-frequency power amplifier 44, and this modulating capacitor Cx is series between the drain electrode of the output OSC2 of this oscillator 41 and this N type MOS (metal-oxide-semiconductor) transistor.When dateout dataB is Digital Logic " 1 ", these N type MOS (metal-oxide-semiconductor) transistor 42 conductings, this modulating capacitor Cx can treat as ground connection, at this moment, this modulating capacitor Cx is in parallel with the capacitor C 2 in this crystal oscillator 41, that is the capacitance of equivalence increasing capacitor C 2, so this crystal oscillator 41 produces the output of one second frequency of oscillation.Otherwise, when dateout dataB is a Digital Logic " and 0 " time, this N type MOS (metal-oxide-semiconductor) transistor 42 is closed, this modulating capacitor Cx suspension joint, and the capacitor C 2 in this crystal oscillator 41 is constant, and at this moment, this crystal oscillator 41 produces this first frequency of oscillation output.The state output that this first frequency of oscillation and this second frequency of oscillation can be looked dateout data sends out with this LC transmitting antenna 45 via this radio-frequency power amplifier 44 again.The difference (modulation voltage) of this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
Whole FSK modulation circuit is made of with this LC transmitting antenna 45 this crystal oscillator 41, this N type MOS (metal-oxide-semiconductor) transistor 42, this modulating capacitor Cx, this radio-frequency power amplifier 44, significantly simplifies the integrated circuit framework.And this N type MOS (metal-oxide-semiconductor) transistor 42 can be found in CMOS processing procedure (CMOS) easily, utilizes general IO input control pin to finish.Therefore, if utilize an IO input control pin, make modulating capacitor Cx be connected in series output OSC2 to crystal oscillator 41, be sent to this radio-frequency power amplifier 44 after producing this first frequency of oscillation or this second frequency of oscillation, launch via this LC transmitting antenna 45 again, can finish the FSK modulation easily.
The present invention also can make digital microcontroller and radio-frequency power amplifier be incorporated in the same integrated circuit, to constitute a simple and easy FSK adjusting controller, shown in Fig. 5 (a).As shown in the figure, whole FSK adjusting controller is surplus one microcontroller 53 that includes radio-frequency power amplifier 531 only, one external crystal oscillator 51, one modulating capacitor Cx, reaching an outside LC transmitting antenna 54 constitutes, wherein this modulating capacitor Cx is controlled by a N type MOS (metal-oxide-semiconductor) transistor 532 output connecting pins of this microcontroller, when N type MOS (metal-oxide-semiconductor) transistor 532 gate terminal NO are Digital Logic " 1 ", these N type MOS (metal-oxide-semiconductor) transistor 532 conductings, this modulating capacitor Cx can treat as ground connection, because this modulating capacitor Cx is in parallel with the capacitor C 2 in the crystal oscillator 51, that is the capacitance of increasing capacitor C 2, so this crystal oscillator 51 produces the output of one second frequency of oscillation.
See also Fig. 5 (b), it is the Organization Chart of the FSK adjusting controller of another preferred embodiment of the present invention.FSK adjusting controller shown in Fig. 5 (b) be to use the CMOS integrated circuit general CMOS framework output with the input pin as control pin, controlling the capacitance of these crystal oscillator 51 outputs, and then produce this first frequency of oscillation and this second frequency of oscillation.When this I/O control pin is an input pattern or when being output as the high impedance operation level, the capacitance of this oscillator output end is constant, this oscillator is exported one first frequency of oscillation; When this I/O control pin is output mode, if this I/O control pin is output as when hanging down operation level, will increase the capacitance of this oscillator output end, this oscillator is exported one second frequency of oscillation; This I/O control pin is the output CMOS shared with input; And/or the difference (modulation voltage) of this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
In like manner, shown in Fig. 6 and Fig. 7 (a), Fig. 7 (b), this modulating capacitor Cx is series at the input OSC1 of this crystal oscillator 41,51, by changing the capacitance of this crystal oscillator 41,51 input OSC1, also can finish a simple and easy FSK adjusting controller easily.
In FSK adjusting controller shown in Figure 6, this modulating capacitor Cx places between the input OSC1 of this N type MOS (metal-oxide-semiconductor) transistor 42 and this crystal oscillator 41.When dateout dataB is Digital Logic " 1 ", these N type MOS (metal-oxide-semiconductor) transistor 42 conductings, this modulating capacitor Cx can treat as ground connection, at this moment, this modulating capacitor Cx is in parallel with the capacitor C 1 in this crystal oscillator 41, that is the capacitance of increasing capacitor C 1, so this this second frequencies of oscillation output of crystal oscillator 41 generations, the frequency modulation(FM) amount is then determined by this modulating capacitor Cx.Otherwise when dateout dataB was Digital Logic " 0 ", this N type MOS (metal-oxide-semiconductor) transistor 42 was closed, and this modulating capacitor Cx can treat as suspension joint, and the capacitor C 1 in this crystal oscillator 41 is constant, and at this moment, this crystal oscillator 41 produces this first frequency of oscillation output.The state output that this first frequency of oscillation and this second frequency of oscillation can be looked dateout data sends out with this LC transmitting antenna 45 via this radio-frequency power amplifier 44 again.
See also Fig. 7 (a), it is the Organization Chart of the FSK adjusting controller of the another preferred embodiment of the present invention.In Fig. 7 (a), this modulating capacitor Cx places between the input OSC1 of this N type MOS (metal-oxide-semiconductor) transistor 532 and this crystal oscillator 51, it is incorporated into digital microcontroller 53 and radio-frequency power amplifier 531 in the same integrated circuit, to constitute a simple and easy FSK adjusting controller.
Fig. 7 (b) is depicted as the present invention's Organization Chart of the FSK adjusting controller of a preferred embodiment again, wherein this modulating capacitor Cx places between the input OSC1 of this N type MOS (metal-oxide-semiconductor) transistor 532 and this crystal oscillator 51, this FSK adjusting controller be to use the CMOS integrated circuit general CMOS framework output with the input pin as control pin, controlling the capacitance of these crystal oscillator 51 outputs, and then produce this first frequency of oscillation and this second frequency of oscillation.
In sum, the invention provides a simple and easy less radio-frequency FSK emitter, with the radio frequency interlock circuit of former the design's complexity, be simplified to a simple and easy single channel FSK Wireless RF transmitter that is constituted by a crystal oscillator, a modulating capacitor, a radio-frequency power amplifier, a MOS (metal-oxide-semiconductor) transistor and a transmitting antenna.
In addition, also utilize common CMOS process technique, radio-frequency power amplifier is integrated in the digital microcontroller, design one includes the microcontroller of radio-frequency power amplifier, and a general I/O control pin that utilizes microcontroller connects an external modulation electric capacity, the frequency of oscillation of control break crystal oscillator is to finish a simple and easy less radio-frequency FSK mission controller.
So, with significantly reducing the complexity of FSK numeral modulation system and the feasibility of realization,, more significantly reduce whole cost so the present invention not only provides a simple and easy less radio-frequency FSK emitter and a mission controller.Therefore, the present invention can effectively improve the shortcoming of known technology, has industrial value, and then realizes purpose of the present invention.
The present invention must carry out multiple modification, the scope of right neither disengaging appended claims by person skilled in the art Shi Renshi craftsman think of.
Claims (14)
1. Wireless RF transmitter, it comprises:
One oscillator, its output provide a stable frequency of oscillation;
One modulating capacitor, its first end is electrically connected on this output of this oscillator, wherein this Wireless RF transmitter utilizes the switching of conducting-closed condition between second end of this modulating capacitor and this modulating capacitor and the earth terminal, modulates this stable frequency of oscillation;
One transistor is connected between this second end and this earth terminal of this modulating capacitor, is subjected to the control of a numerical data and conducting or close, to control this conducting-closed condition;
One radio-frequency power amplifier, its input are electrically connected on this output of this oscillator, receive this stable frequency of oscillation, and produce an energy according to the transmit power needs of setting; And
One transmitting antenna is electrically connected on this radio-frequency power amplifier, receives this energy, and launches a modulated carrier signal.
2. Wireless RF transmitter as claimed in claim 1 is characterized in that this Wireless RF transmitter is a less radio-frequency frequency displacement keying method emitter.
3. Wireless RF transmitter as claimed in claim 1 is characterized in that this oscillator is a crystal oscillator.
4. Wireless RF transmitter as claimed in claim 1 is characterized in that this transistor is a N type MOS (metal-oxide-semiconductor) transistor.
5. Wireless RF transmitter as claimed in claim 4 is characterized in that this modulating capacitor is series between the drain electrode of this output of this oscillator and this N type MOS (metal-oxide-semiconductor) transistor, and:
When this N type MOS (metal-oxide-semiconductor) transistor was closed, the capacitance of this this output of oscillator remained unchanged, and this oscillator is exported one first frequency of oscillation; And
When this N type MOS (metal-oxide-semiconductor) transistor conducting, this modulating capacitor and the electric capacity of voltage regulation of this this output of oscillator ground connection in parallel, thereby increase this capacitance of this this output of oscillator, this oscillator is exported one second frequency of oscillation.
6. Wireless RF transmitter as claimed in claim 5, the difference that it is characterized in that this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
7. less radio-frequency mission controller, it comprises:
One oscillator, its output provide a stable frequency of oscillation;
One modulating capacitor, its first end is electrically connected on this output of this oscillator;
One microcontroller, be electrically connected on this output of this oscillator, include a radio-frequency power amplifier and a control pin, wherein this control pin is electrically connected on second end of this modulating capacitor, this microprocessor controls should be controlled the conducting-closed condition between a pin and the earth terminal, and this less radio-frequency mission controller utilizes the switching of this modulating capacitor and this conducting-closed condition, modulates this stable frequency of oscillation; And
One transmitting antenna is electrically connected on this microcontroller, in order to launch a modulated carrier signal.
8. less radio-frequency mission controller as claimed in claim 7 is characterized in that this control pin is an I/O control pin.
9. less radio-frequency mission controller as claimed in claim 8 is characterized in that:
This modulating capacitor is series between this output and this I/O control pin of this oscillator;
When this I/O control pin is an input pattern or when being output as the high impedance operation level, the capacitance of this this output of oscillator is constant, this oscillator is exported one first frequency of oscillation;
When this I/O control pin is output mode, if this I/O control pin is output as when hanging down operation level, will increase this capacitance of this this output of oscillator, this oscillator is exported one second frequency of oscillation; And
This I/O control pin is the output CMOS shared with input.
10. less radio-frequency mission controller as claimed in claim 9, the difference that it is characterized in that this first frequency of oscillation and this second frequency of oscillation is by this modulating capacitor control.
11. less radio-frequency mission controller as claimed in claim 7 is characterized in that this radio-frequency power amplifier receives the output frequency of this this output of oscillator, and according to the transmit power needs of setting, this modulated carrier signal is gone out by this transmission antennas transmit.
12. a Wireless RF transmitter, it comprises:
One oscillator, its output provide a stable frequency of oscillation;
One modulating capacitor, its first end is electrically connected on the input of this oscillator, wherein this Wireless RF transmitter utilizes the switching of conducting-closed condition between second end of this modulating capacitor and this modulating capacitor and the earth terminal, modulates this stable frequency of oscillation;
One transistor is connected between this second end and this earth terminal of this modulating capacitor, is subjected to the control of a numerical data and conducting or close, to control this conducting-closed condition;
One radio-frequency power amplifier, its input are electrically connected on this output of this oscillator, receive this stable frequency of oscillation, and produce an energy according to the transmit power needs of setting; And
One transmitting antenna is electrically connected on this radio-frequency power amplifier, receives this energy, and launches a modulated carrier signal.
13. a less radio-frequency mission controller, it comprises:
One oscillator, its output provide a stable frequency of oscillation;
One modulating capacitor, its first end is electrically connected on the input of this oscillator;
One microcontroller, be electrically connected on this output of this oscillator, include a radio-frequency power amplifier and a control pin, wherein this control pin is electrically connected on second end of this modulating capacitor, this microprocessor controls should be controlled the conducting-closed condition between a pin and the earth terminal, and this less radio-frequency mission controller utilizes the switching of this modulating capacitor and this conducting-closed condition, modulates this frequency of oscillation; And
One transmitting antenna is electrically connected on this microcontroller, in order to launch a modulated carrier signal.
14. less radio-frequency mission controller as claimed in claim 11, it is characterized in that this radio-frequency power amplifier receives the output frequency of this this output of oscillator, and, this modulated carrier signal is gone out by this transmission antennas transmit according to the transmit power needs of setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100701799A CN100559783C (en) | 2005-05-10 | 2005-05-10 | Wireless RF transmitter and controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100701799A CN100559783C (en) | 2005-05-10 | 2005-05-10 | Wireless RF transmitter and controller |
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| CN1863179A CN1863179A (en) | 2006-11-15 |
| CN100559783C true CN100559783C (en) | 2009-11-11 |
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| CNB2005100701799A Expired - Fee Related CN100559783C (en) | 2005-05-10 | 2005-05-10 | Wireless RF transmitter and controller |
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