CN214756252U - Voltage controlled oscillator and interphone - Google Patents
Voltage controlled oscillator and interphone Download PDFInfo
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- CN214756252U CN214756252U CN202023341485.0U CN202023341485U CN214756252U CN 214756252 U CN214756252 U CN 214756252U CN 202023341485 U CN202023341485 U CN 202023341485U CN 214756252 U CN214756252 U CN 214756252U
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Abstract
The application discloses voltage controlled oscillator and intercom, voltage controlled oscillator includes: the radio frequency switch comprises a first inductor, a radio frequency switch and a first capacitor. The first capacitor and the first inductor form at least one part of the LC oscillating circuit; the LC oscillating circuit is used for selecting the frequency output by the voltage-controlled oscillator, and the radio frequency switch is used for enabling the first capacitor to be connected with or not connected with the LC oscillating circuit so as to change the oscillating frequency of the LC oscillating circuit and further change the frequency output by the voltage-controlled oscillator. By the technical scheme, the performance of the voltage-controlled oscillator can be improved while the spread spectrum of the voltage-controlled oscillator is realized.
Description
Technical Field
The application relates to the field of wireless communication, in particular to a voltage-controlled oscillator and an interphone.
Background
The voltage-controlled oscillator is an oscillating circuit with output frequency corresponding to input control voltage, wherein the frequency is a function of the input signal voltage, and the working state of the oscillator or the element parameters of the oscillating circuit are controlled by the input control voltage to form the voltage-controlled oscillator. The general voltage-controlled oscillator still has the problems of large power consumption and the like in the use process of the voltage-controlled oscillator, so that the performance of the voltage-controlled oscillator is poor.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application mainly solved provides a voltage controlled oscillator and intercom for optimize voltage controlled oscillator's performance when realizing the spread spectrum.
In order to solve the above technical problem, the first technical solution adopted by the present application is: provided is a voltage-controlled oscillator including: the radio frequency switch is connected with the first inductor, and the first inductor is connected with the radio frequency switch; the LC oscillating circuit is used for selecting the frequency output by the voltage-controlled oscillator, and the radio frequency switch is used for enabling the first capacitor to be connected with or not connected with the LC oscillating circuit so as to change the oscillating frequency of the LC oscillating circuit and further change the frequency output by the voltage-controlled oscillator.
In order to solve the above technical problem, the second technical solution adopted by the present application is: provided is an interphone including: the voltage controlled oscillator.
The beneficial effect of this application is: according to the method, the radio frequency switch is added in the voltage-controlled oscillator to change the capacitance value of the main oscillation capacitor in the LC oscillation circuit, so that the oscillation frequency of the LC oscillation circuit is changed, and the frequency of signal output of the voltage-controlled oscillator is changed.
Meanwhile, because the radio frequency switch has the characteristics of low on-resistance and low current, the working current is in the microampere level, and low power consumption is realized in the circuit. And the process of waiting for discharging does not exist when the frequency band is switched by the radio frequency switch, so that the locking time can meet the requirement. Therefore, the capacitance value of the main oscillator capacitor in the LC oscillating circuit is controlled through the radio frequency switch, and the performance of the voltage-controlled oscillator can be optimized while the spread spectrum is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts, wherein:
fig. 1 is a schematic diagram of a first structure of an embodiment of a voltage-controlled oscillator of the present application;
fig. 2 is a schematic diagram of a second structure of an embodiment of a voltage-controlled oscillator of the present application;
FIG. 3 is a schematic diagram of a third structure of an embodiment of a voltage controlled oscillator of the present application;
fig. 4 is a schematic structural diagram of an embodiment of an intercom of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a first structural diagram of a voltage controlled oscillator according to an embodiment of the present application. The voltage-controlled oscillator 300 described in the voltage-controlled oscillator embodiment of the present application may include: a first inductor L1, a radio frequency switch RF2, and a first capacitor C1.
The first capacitor C1 and the first inductor L1 form at least a part of an LC tank circuit. The LC oscillating circuit is used for selecting the frequency output by the voltage-controlled oscillator 300, and the radio frequency switch RF2 is used for switching the first capacitor C1 into or out of the LC oscillating circuit to change the oscillating frequency of the LC oscillating circuit, thereby changing the frequency output by the voltage-controlled oscillator 300.
The radio frequency switch RF2 is obtained by connecting the first capacitor C1 to an LC oscillating circuitThe frequency range of (a) plus the frequency range obtained by the first capacitor C1 not being connected to the LC oscillator circuit is the frequency range that the whole voltage controlled oscillator 300 can cover. Because of the oscillation frequency of the LC oscillating circuit
Here, C denotes a main oscillation capacitance of the LC oscillation circuit, and L denotes a main oscillation inductance. The more the capacitance is connected in parallel, the larger the equivalent capacitance of the main oscillation capacitance of the LC oscillation circuit is, and the smaller the oscillation frequency is. Therefore, after the RF switch RF2 connects the first capacitor C1 to the LC oscillating circuit, it is equivalent to connect a capacitor in parallel, that is, the equivalent capacitance of the main oscillator capacitor of the LC oscillating circuit becomes large, thereby reducing the frequency of the output signal of the voltage-controlled oscillator 300.
For example, when the RF switch RF2 connects the first capacitor C1 to the LC oscillating circuit, the voltage controlled oscillator 300 covers a range of 350-.
The radio frequency switch RF2 controls whether the first capacitor C1 is connected to the LC oscillating circuit, so as to change the equivalent capacitance value of the main oscillating capacitor in the LC oscillating circuit, thereby changing the oscillating frequency of the LC oscillating circuit, and thus changing the frequency of the output signal of the voltage-controlled oscillator 300.
And, since the RF switch RF2 has low on-resistance and low current characteristics, the operating current is in the microampere level, achieving low power consumption in the circuit. And the process of waiting for discharging does not exist when the frequency band is switched by the radio frequency switch RF2, so that the locking time can meet the requirement. Therefore, the RF switch RF2 controls the capacitance of the main capacitor in the LC oscillator circuit, which can optimize the performance of the vco 300 while achieving frequency spreading.
The voltage-controlled oscillator 300 comprises a second capacitor C2, wherein the second capacitor C2 and the first capacitor C1 have different capacitance values. One end of each of the first capacitor C1 and the second capacitor C2 is connected to one end of the first inductor L1, the other end of each of the first capacitor C1 and the second capacitor C2 is coupled to the first end and the second end of the RF switch RF2, the third end of the RF switch RF2 and the other end of the first inductor L1 are grounded, respectively, and the control end of the RF switch RF2 is configured to access a control signal to switch on the first end and the third end in response to the control signal, and switch off the second end and the third end, or switch on the second end and the third end, and switch off the first end and the third end.
Specifically, the radio frequency switch RF2 switches one of the first capacitor C1 and the second capacitor C2 into the LC oscillating circuit at the present time, and the other is not switched into the LC oscillating circuit, so that the main oscillating capacitance of the LC oscillating circuit at the present time is determined by one of the switched-in circuits, and the other is independent of the oscillating frequency of the present LC oscillating circuit. That is, after a capacitor with a smaller capacitance value is connected to the LC oscillating circuit, the oscillating frequency of the LC oscillating circuit is greater than that after a capacitor with a larger capacitance value is connected to the LC oscillating circuit.
By providing the second capacitor C2, and the capacitance of the second capacitor C2 is different from that of the first capacitor C1, the frequency coverage is wider than that of the vco 300 with only one first capacitor C1.
The present embodiment adopts a single-pole double-throw RF switch 2, but in other embodiments, the present embodiment may also be a single-pole double-throw RF switch, that is, the present embodiment may further include a plurality of second capacitors C2 with different capacitance values, and the oscillation frequency of the LC oscillation circuit is changed by selecting one of the second capacitors.
The voltage-controlled oscillator 300 includes a third capacitor C3, one end of the third capacitor C3 is connected to one end of the first inductor L1, the other end is grounded, and a capacitance value of the third capacitor C3 is smaller than capacitance values of the first capacitor C1 and the second capacitor C2. If the capacitance value of the third capacitor C3 is too large, the oscillation frequency of the LC oscillation circuit will be too low, so that the frequency range covered by the voltage-controlled oscillator 300 is too low. For example, when the covering frequency range of the vco 300 is 350-470MHZ, the first inductor L1 may be 8nh, the first capacitor C1 may be 2pf, the second capacitor C2 may be 9pf, and the third capacitor C3 may be 1pf, or even a few tenths of a picofarad. I.e. the capacitance of the second capacitor C2 is almost 3-6 times the capacitance of the first capacitor C1. Of course, in other embodiments, the capacitance values of the first capacitor C1 and the second capacitor C2 may be other, which is only an example and is not intended to limit the present application, and the capacitance ratio of the first capacitor C1 and the second capacitor C2 may also be other, which is specifically determined by the capacitance value of the whole circuit, so that the present application is not limited thereto. In other embodiments, the third capacitor C3 may be omitted, so that the LC oscillating circuit oscillates at a higher frequency than the third capacitor C3. Therefore, whether the third capacitor C3 needs to be added to the LC oscillation circuit depends on the actual situation.
Referring to fig. 2, fig. 2 is a schematic diagram of a second structure of the voltage-controlled oscillator of the present application. The radio frequency switch RF1 is a single pole, single throw switch, in which case the second capacitor C2 and the third capacitor C3 described above are not included.
Therein, the voltage controlled oscillator 300 comprises a fourth capacitor C4. One end of the first capacitor C1 and one end of the fourth capacitor C4 are respectively connected to one end of the first inductor L1, the other end of the first capacitor C1 is connected to one end of the radio frequency switch RF1, the other ends of the first inductor L1, the fourth capacitor C4 and the radio frequency switch RF1 are respectively grounded, and the control end of the radio frequency switch RF1 is used for receiving a control signal so as to connect the first capacitor C1 to the LC oscillation circuit or not to connect the first capacitor C1 to the LC oscillation circuit in response to the control signal. Specifically, the single-pole single-throw RF switch RF1 changes the equivalent capacitance of the LC tank circuit by controlling whether the first capacitor C1 is switched into or out of the LC tank circuit in response to a control signal. If the first capacitor C1 is connected to the LC oscillation circuit, the first capacitor C1 is connected in parallel with the fourth capacitor C4, so that the capacitance value of the main oscillation capacitor of the LC oscillation circuit is increased, and the oscillation frequency of the LC oscillation circuit is lower than that in the case where the first capacitor C1 is not connected to the LC oscillation circuit. Therefore, the purpose of spreading can be achieved by combining the two cases.
By adding the fourth capacitor C4 in the LC oscillating circuit, an LC oscillating circuit can be formed when the first capacitor C1 is not connected to the circuit, and the spread spectrum of the voltage-controlled oscillator 300 is realized.
In other embodiments, the RF switch RF1 may also be other types of switches, such as double-pole double-throw or double-pole single-throw, etc., which are not specifically defined herein, and the number of the RF switches RF1 may also be plural.
Referring to fig. 3, fig. 3 is a schematic diagram of a third structure of the voltage-controlled oscillator embodiment of the present application. The number of the RF switches RF1 in the vco 300 is greater than one, and the embodiment takes two RF switches RF1 as an example. Of course, in other embodiments, the number of the radio frequency switches RF1 may be three, four, etc., and the number of the radio frequency switches RF1 is not limited. The first ends of the two radio frequency switches RF1 are respectively connected with a capacitor C11And a capacitor C12Capacitor C11And a capacitor C12The other end of the first inductor L1 is connected to the ungrounded end of the first inductor L1. The second terminal of the RF switch RF1, i.e., VCTL terminal in the figure, is coupled to a control signal for coupling the capacitor C1 in response to the control signal1And a capacitor C12And the LC oscillating circuit is connected or not connected. In particular, the control signal switched in by each radio frequency switch RF1 is different, i.e. the capacitance C1 at the present moment1Or a capacitor C12An LC oscillating circuit is connected. In this case, the capacitor C11And a capacitor C12Are different. Of course, if the fourth capacitance C4 is included in the LC oscillation circuit, the capacitance C1 is present at the present moment1Or a capacitor C12None of them connected to the LC tank circuit can also implement spread spectrum. Of course, the RF switch RF1 can also be other types of RF switches RF1, such as double-pole double-throw or single-pole multiple-throw, etc., and this embodiment is not specifically limited. In other embodiments, in the vco 300, a switch (not shown) may be provided for turning on or off the power supply to the RF switch RF1, which may respond to the control signal when the RF switch RF1 is powered on, and the RF switch RF1 does not respond to the control signal if the RF switch RF1 is not powered on. Wherein the switch may be a radio frequency switch RF 1.
The radio frequency switch RF1 is connected to one end of the fourteenth capacitor C14, wherein the other end of the fourteenth capacitor C14 is grounded, thereby realizing that one end of the radio frequency switch RF1 is grounded. At this time, the fourteenth capacitor C14 plays a role of blocking dc in the LC oscillating circuit, and by providing such a capacitor for blocking dc in the LC oscillating circuit, the influence of dc offset and some low frequency components can be reduced to some extent.
The voltage-controlled oscillator 300 includes an eleventh capacitor C11, a third inductor L3, a fourth inductor L4, a fifth inductor L5, a first varactor group V1, and a second varactor group V2. One end of the eleventh capacitor C11, the anodes of all the varactors in the first varactor group V1, and one end of the fifth inductor L5 are respectively grounded. The other end of the eleventh capacitor C11 and one end of the third inductor L3 are respectively connected to an external circuit for inputting a control voltage, one end of the fourth inductor L4 is connected to the other end of the third inductor L3, and the other end of the fourth inductor L4 is respectively connected to cathodes of all the varactors in the first and second varactor groups V2. The positive electrodes of all the varactors in the second varactor group V2 are respectively connected with capacitors, and the other ends of the capacitors, one ends of which are connected with the positive electrodes of the varactors, are respectively connected with the ungrounded end of the first inductor L1. The anodes of all the varactors in the second varactor group V2 are connected to the other end of the fifth inductor L5, respectively. All the capacitances connected to the positive electrodes of the varactors in the second varactor group V2 are equal in capacitance value. Of course, in other embodiments, the capacitance of the capacitor connected to the positive electrode of the varactor in the second varactor group V2 may be different, and is not limited herein.
Specifically, all the varactors in the first varactor group V1 are connected to the anodes of all the varactors in the second varactor group V2 through the fifth inductor L5, respectively, and the anodes of all the varactors in the second varactor group V2 are also connected to one end of another capacitor. And the cathodes of all the varactors in the first group of varactors V1 are connected to the cathodes of all the varactors in the second group of varactors V2.
Wherein the first varactor group V1 includes a first varactor VCD1 and a second varactor VCD2, and the second varactor group V2 includes a third varactor VCD3 and a fourth varactor VCD 4. The capacitance values of the first varactor VCD1 and the second varactor VCD2 are the same, and the capacitance values of the third varactor VCD3 and the fourth varactor VCD4 are the same. In other embodiments, the capacitance characteristics of the first varactor VCD1 and the second varactor VCD2 may be different, and the capacitance characteristics of the third varactor VCD3 and the fourth varactor VCD4 may not be the same, which is determined by the specific situation in a specific embodiment.
The cathodes of the first, second, third and fourth varactors VCD4 are connected to one end of the fourth inductor L4, respectively. I.e., the first and second varactor VCD2, are connected to the cathodes of the third and fourth varactor VCD 4. The anodes of the first and second varactors VCD1 and VCD2 are each grounded. The positive electrode of the third varactor VCD3 is connected to one end of the twelfth capacitor C12, and the positive electrode of the fourth varactor VCD4 is connected to one end of the thirteenth capacitor C13. And the capacitance values of the twelfth capacitor C12 and the thirteenth capacitor C13 are equal. The anode of the third varactor VCD3 and the anode of the fourth varactor VCD4 are connected to one end of the fifth inductor L5, respectively. And the other ends of the twelfth capacitor C12 and the thirteenth capacitor C13 are respectively connected to the ungrounded end of the first inductor L1.
Specifically, the cathodes of the first and second varactors VCD2 are connected to the cathodes of the third and fourth varactors VCD4, and the anodes of the first and second varactors VCD2 are connected to the anodes of the third and fourth varactors VCD4 through a fifth inductor L5.
By switching the varactor diode back into the circuit, the junction capacitance of the varactor diode is reduced when the input control voltage is increased. Therefore, when the input control voltage increases, the junction capacitance of the first varactor VCD1, the second varactor VCD4, the third varactor VCD1, and the fourth varactor VCD4 in the circuit decreases, that is, the equivalent capacitance of the first varactor VCD1 and the second varactor VCD2 decreases correspondingly after being connected in parallel, and the equivalent capacitance of the first varactor VCD2 and the second varactor VCD2 is connected to the positive electrodes of the third varactor VCD3 and the fourth varactor VCD4 through the fifth inductor L5, that is, the four varactors are connected in parallel, so that the equivalent capacitance after being connected in parallel decreases accordingly, the oscillation frequency of the LC oscillation circuit increases, and therefore, the frequency of the output signal of the voltage-controlled oscillator 300 also increases accordingly.
In other embodiments, the first varactor group V1 has only one first varactor VCD1, while the second varactor group V2 has one third varactor VCD 3. The cathode of the first varactor VCD1 is connected to the cathode of the third varactor VCD3, the anode of the first varactor VCD1 is connected to the anode of the third varactor VCD3 through an inductor, and the anode of the third varactor VCD3 is connected to one end of a capacitor. The other end of the capacitor is connected to the ungrounded end of the first inductor L1.
The voltage-controlled oscillator 300 includes a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a second inductor L2, a resistor R, and a transistor T1. The fifth capacitor C5 is connected in parallel with the sixth capacitor C6, and one end of each of the fifth capacitor C5 and the sixth capacitor C6 is connected to the ungrounded end of the first inductor L1, and the other end of each of the fifth capacitor C5 and the sixth capacitor C6 is connected to the base of the transistor T1. One end of the seventh capacitor C7 is connected to the base of the transistor T1, the other end is connected to one end of the eighth capacitor C8, and the other end of the eighth capacitor C8 is grounded. One end of the ninth capacitor C9 is connected to the ungrounded end of the eighth capacitor C8, and the other end of the ninth capacitor C9 is connected to the collector of the transistor T1. One end of the second inductor L2 is connected to the collector of the transistor T1, the other end of the second inductor L2 is connected to one end of the resistor R, and the other end of the resistor R is grounded. One end of the tenth capacitor C10 is connected to the emitter of the transistor T1, and the other end is connected to an external circuit.
By providing the transistor T1 in the voltage controlled oscillator 300, the frequency output by the voltage controlled oscillator 300 is stabilized by the amplified signal of the transistor T1 and the feedback function.
Through tests, when the output frequency of the voltage-controlled oscillator 300 is in the 350-470MHz band, when the first capacitor C1 is connected into the LC oscillating circuit, if the input control voltage is 940mv, the output frequency of the voltage-controlled oscillator 300 is about 350MHz, and when the input control voltage is 4.3V, the output frequency of the voltage-controlled oscillator 300 is about 399.4 MHz. When the first capacitor C1 is not connected to the LC oscillating circuit, if the input control voltage is about 1V, the output frequency of the voltage-controlled oscillator 300 is about 397.97MHZ, and if the input control voltage is about 4.2V, the junction capacitances of all the varactors reversely connected to the circuit decrease, that is, the equivalent capacitance of the oscillating circuit decreases accordingly, so the oscillation frequency of the equivalent capacitance of the oscillating circuit also increases, and the experimental result shows that the output frequency of the voltage-controlled oscillator 300 is about 470 MHZ.
In summary, the voltage-controlled oscillator 300 provided in the present application can implement frequency spreading, and at the same time, because the radio frequency switch RF1 does not wait for the discharging process in the process of connecting or disconnecting the first capacitor C1 to the LC oscillating circuit, the locking time can be reduced to a certain extent, so that the locking time meets the index requirement.
Generally, if the voltage-controlled oscillator 300 needs to perform frequency spreading, a plurality of voltage-controlled oscillators 300 are arranged to be overlapped to cover a wider frequency band, and only one voltage-controlled oscillator 300 is needed to implement the present application, so that the voltage-controlled oscillator 300 of the present application has a simple circuit and a low cost, and compared with the overlapped design scheme of a plurality of voltage-controlled oscillators 300, the voltage-controlled oscillator 300 provided by the present application occupies a smaller area of a circuit board.
In addition, the RF switch RF1 in the vco 300 provided by the present application has a low insertion loss effect for the whole circuit, i.e. has a small impact on the circuit.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an intercom according to an embodiment of the present application. As shown in fig. 4, the intercom 10 of the present embodiment includes the voltage-controlled oscillator 300 described above.
The interphone 10 further comprises a microphone 100, the microphone 100 is used for converting the voice of the user into an audio signal, wherein the first audio amplifying circuit 200 is connected to the microphone 100, the first audio amplifying circuit 200 is used for reconstructing the audio signal, and the volume and the power of the reconstructed audio signal are better than those before reconstruction. The first audio amplifying circuit 200 is connected to the voltage controlled oscillator 300, the voltage controlled oscillator 300 is used for changing the frequency of the audio signal, the voltage controlled oscillator 300 is connected to the modulating circuit 400, and the modulating circuit 400 is used for modulating the audio signal. The modulation circuit 400 is connected to a high frequency amplification circuit 500, and the high frequency amplification circuit 500 is used for performing power amplification on the modulated signal to meet the requirement of transmission power. The high frequency amplifying circuit 500 is connected to the transceiving band-pass filter circuit 600, wherein the transceiving band-pass filter circuit 600 is used for filtering, and finally, the audio signal is transmitted through the antenna 700.
The intercom 10 further includes a frequency selection amplifying circuit 800, configured to perform frequency selection on an audio signal obtained after the audio signal received by the antenna 700 passes through the transceiving band-pass filter circuit 600, and amplify the frequency of the signal obtained after the frequency selection, and the received audio signal is played through the speaker 1300 after the frequency selection amplifying circuit 800 is sequentially connected to the mixer circuit 900, the relay circuit 1000, the demodulation circuit 1100, and the second audio amplifying circuit 1200. Here, the first audio amplifier circuit 200 and the second audio amplifier circuit 1200 may be the same or different, and are not specifically defined herein. The mixer circuit 900 is used to convert an audio signal from one frequency to another frequency, and essentially performs a spectral linear shift on the audio signal. The relay circuit 1000 is used to implement data transmission. The demodulation circuit 1100 corresponds to a modulation circuit for demodulating a signal after modulation.
The structure of the voltage controlled oscillator 300 is as described above and will not be described herein.
The intercom 10 provided herein may be handheld, vehicle (boat, airplane), stationary, repeater, etc.
The interphone 10 provided by the embodiment of the application has the advantages of simple structure and reasonable design, can perform frequency conversion, and improves the use benefit of the interphone 10 to a certain extent.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (10)
1. A voltage controlled oscillator, comprising:
the radio frequency switch comprises a first inductor, a radio frequency switch and a first capacitor, wherein the first capacitor and the first inductor form at least one part of an LC oscillating circuit;
the LC oscillating circuit is used for selecting the frequency output by the voltage-controlled oscillator, and the radio frequency switch is used for enabling the first capacitor to be connected with or not connected with the LC oscillating circuit so as to change the oscillating frequency of the LC oscillating circuit and further change the frequency output by the voltage-controlled oscillator.
2. The voltage controlled oscillator of claim 1, wherein:
a second capacitor is included;
the capacitance values of the second capacitor and the first capacitor are different, one end of the first capacitor and one end of the second capacitor are connected with one end of the first inductor, the other ends of the first capacitor and the second capacitor are respectively coupled to the first end and the second end of the radio frequency switch, the third end of the radio frequency switch and the other end of the first inductor are respectively grounded, and the control end of the radio frequency switch is used for accessing a control signal so as to respond to the control signal to switch on the first end and the third end and switch off the second end and the third end, or switch on the second end and the third end and switch off the first end and the third end.
3. The voltage controlled oscillator of claim 2, wherein:
the inductor comprises a third capacitor, one end of the third capacitor is connected with one end of the first inductor, the other end of the third capacitor is grounded, and the capacitance value of the third capacitor is smaller than that of the first capacitor and that of the second capacitor.
4. The voltage controlled oscillator of claim 1, wherein:
a fourth capacitor is included;
one end of the first capacitor and one end of the fourth capacitor are respectively connected with one end of the first inductor, the other end of the first capacitor is connected with one end of the radio frequency switch, the other ends of the first inductor, the fourth capacitor and the radio frequency switch are respectively grounded, and a control end of the radio frequency switch is used for accessing a control signal so as to respond to the control signal to enable the first capacitor to be accessed into the LC oscillation circuit or not to be accessed into the LC oscillation circuit.
5. The voltage controlled oscillator of claim 1, wherein:
the circuit comprises a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a second inductor, a resistor and a triode;
the fifth capacitor and the sixth capacitor are connected in parallel, one ends of the fifth capacitor and the sixth capacitor are respectively connected with one end of the first inductor, and the other ends of the fifth capacitor and the sixth capacitor are respectively connected with the base stage of the triode;
one end of the seventh capacitor is connected with the base level of the triode, the other end of the seventh capacitor is connected with one end of the eighth capacitor, and the other end of the eighth capacitor is grounded;
one end of the ninth capacitor is connected with the ungrounded end of the eighth capacitor, and the other end of the ninth capacitor is connected with the collector of the triode;
one end of the second inductor is connected with the collector of the triode, the other end of the second inductor is connected with one end of the resistor, and the other end of the resistor is grounded;
one end of the tenth capacitor is connected with the emitter of the triode, and the other end of the tenth capacitor is connected with an external circuit.
6. The voltage controlled oscillator of claim 1, wherein:
the inductor comprises an eleventh capacitor, a third inductor, a fourth inductor, a fifth inductor, a first variable capacitance diode group and a second variable capacitance diode group;
one end of the eleventh capacitor, the anodes of all the varactors in the first varactor group, and one end of the fifth inductor are grounded, respectively;
the other end of the eleventh capacitor and one end of the third inductor are respectively connected with an external circuit and used for inputting control voltage, one end of the fourth inductor is connected with the other end of the third inductor, and the other end of the fourth inductor is respectively connected with the cathodes of all the variable capacitance diodes in the first variable capacitance diode group and the second variable capacitance diode group;
the anodes of all the variable capacitance diodes in the second variable capacitance diode group are respectively connected with capacitors, and the other ends of the capacitors, one ends of which are connected with the anodes of the variable capacitance diodes, are respectively connected with the ungrounded end of the first inductor;
and the anodes of all the variable capacitance diodes in the second variable capacitance diode group are respectively connected with the other end of the fifth inductor.
7. The voltage controlled oscillator of claim 6, wherein:
the first varactor group comprises a first varactor and a second varactor, and the second varactor group comprises a third varactor and a fourth varactor;
cathodes of the first, second, third and fourth varactors are respectively connected to one end of the fourth inductor, and anodes of the first and second varactors are respectively grounded;
the anode of the third varactor is connected with one end of a twelfth capacitor, and the anode of the fourth varactor is connected with one end of a thirteenth capacitor, wherein the anode of the third varactor and the anode of the fourth varactor are respectively connected with one end of a fifth inductor;
the other ends of the twelfth capacitor and the thirteenth capacitor are respectively connected with the ungrounded end of the first inductor.
8. The voltage controlled oscillator of claim 1, wherein:
the number of the radio frequency switches is greater than 1, the first ends of all the radio frequency switches are respectively connected with the first capacitors, wherein the number of the first capacitors is greater than or equal to that of the radio frequency switches, and the other ends of all the first capacitors are connected with the ungrounded end of the first inductor;
the second end of the radio frequency switch is used for accessing a control signal so as to respond to the control signal to switch on the first capacitor to access the LC oscillating circuit or not to access the LC oscillating circuit, and the third end of the radio frequency switch is used for accessing a control power supply.
9. The voltage controlled oscillator of any one of claims 1 to 8, wherein:
the radio frequency switch is connected with one end of a fourteenth capacitor, and the other end of the fourteenth capacitor is grounded so as to realize that one end of the radio frequency switch is grounded.
10. An intercom comprising the voltage controlled oscillator of any of claims 1-9.
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| CN202023341485.0U CN214756252U (en) | 2020-12-30 | 2020-12-30 | Voltage controlled oscillator and interphone |
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| CN202023341485.0U CN214756252U (en) | 2020-12-30 | 2020-12-30 | Voltage controlled oscillator and interphone |
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