CN114244333B - Control voltage generating device and radio frequency switch - Google Patents
Control voltage generating device and radio frequency switch Download PDFInfo
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- CN114244333B CN114244333B CN202111420527.6A CN202111420527A CN114244333B CN 114244333 B CN114244333 B CN 114244333B CN 202111420527 A CN202111420527 A CN 202111420527A CN 114244333 B CN114244333 B CN 114244333B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/06—Modifications for ensuring a fully conducting state
- H03K17/063—Modifications for ensuring a fully conducting state in field-effect transistor switches
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Abstract
The invention relates to a control voltage generating device and a radio frequency switch. The device includes: the standard voltage circuit is used for outputting a standard voltage to the booster circuit; the oscillating circuit is used for receiving the standard voltage and outputting a first control signal to the booster circuit and the level shift circuit; the booster circuit is used for boosting the standard voltage into a first control voltage under the control of a first control signal and outputting the first control voltage; the level shift circuit is electrically connected with the oscillation circuit and used for receiving the first control signal and converting the first control signal into a second control signal; the negative voltage generating circuit is respectively electrically connected with the booster circuit and the level shift circuit and is used for converting the first control voltage into a second control voltage under the control of a second control signal and outputting the second control voltage; the technical problem that the radio frequency switch cannot be normally switched when the voltage of the power supply 100 is low in the prior art is solved, so that the radio frequency switch can be normally switched at low voltage, and the application range of the radio frequency switch is widened.
Description
Technical Field
The present invention relates to the field of radio frequency switch technologies, and in particular, to a control voltage generating device and a radio frequency switch.
Background
In the field of Radio Frequency (RF) switches, analog control auxiliary circuits are required to control the state of the RF switch. The rf switch device typically has 3 ports, including an RFin input port, an RFout output port, and a control port, respectively. The control port is controlled by a control signal (Von/Voff) generated by the analog auxiliary circuit to control the on and off states of the switch.
However, in order to obtain better RF performance, the ideal voltage values of Von and Voff are between (2.5V to 3V) or (-2.5V to-3V). When the value of the power voltage is greater than 3V, the control signal may be generated by the voltage regulator and the charge pump, but when the value of the power voltage is less than 3V, the voltage required for Von/Voff may not be stably supplied.
Disclosure of Invention
In view of the above, it is desirable to provide a control voltage generating device and a radio frequency switch that can be applied to a low voltage power supply.
A control voltage generation device, the control voltage generation device comprising: the circuit comprises a standard voltage circuit, a booster circuit, an oscillation circuit, a level shift circuit and a negative voltage generating circuit;
the standard voltage circuit is electrically connected with the booster circuit and is used for outputting standard voltage to the booster circuit;
the oscillation circuit is electrically connected with the standard voltage circuit and used for receiving the standard voltage and outputting a first control signal to the boosting circuit and the level shifting circuit;
the boosting circuit is used for boosting the standard voltage into a first control voltage under the control of the first control signal and outputting the first control voltage;
the level shift circuit is electrically connected with the oscillation circuit and is used for receiving the first control signal and converting the first control signal into a second control signal;
the negative voltage generating circuit is respectively electrically connected with the booster circuit and the level shift circuit and is used for converting the first control voltage into a second control voltage under the control of the second control signal and outputting the second control voltage;
wherein the first control voltage and the second control voltage are opposite in phase.
In one embodiment, the control voltage generating means further comprises a power supply;
the power supply is used for supplying a power supply voltage to the standard voltage circuit;
the standard voltage circuit is used for converting the power supply voltage into the standard voltage and outputting the standard voltage to the booster circuit and the oscillation circuit.
In one embodiment, the standard voltage circuit includes: a reference voltage circuit and a voltage stabilizing circuit;
the reference voltage circuit is electrically connected with the voltage stabilizing circuit and used for receiving the power voltage, converting the power voltage into reference voltage and outputting the reference voltage to the voltage stabilizing circuit;
the voltage stabilizing circuit is electrically connected with the booster circuit and is used for converting the reference voltage into a standard voltage and outputting the standard voltage to the booster circuit.
In one embodiment, the boost circuit includes a first voltage input, a first voltage output, a first signal input, and a second signal input;
the first voltage input end is electrically connected with the standard voltage circuit and used for receiving the standard voltage;
the first voltage output end is used for outputting the first control voltage;
the first signal input end and the second signal input end are both electrically connected with the oscillating circuit;
the first control signal comprises a first square wave signal and a second square wave signal which are opposite in phase, the first signal input end is used for receiving the first square wave signal, and the second signal input end is used for receiving the second square wave signal.
In one embodiment, the boost circuit further comprises: the circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor and a third capacitor;
a first end of the first transistor is electrically connected with the first voltage input end, a second end of the first transistor is electrically connected with a first end of the first capacitor, and a control end of the first transistor is electrically connected with a first end of the second capacitor;
a first end of the second transistor is electrically connected with a first end of the first capacitor, a second end of the first transistor is electrically connected with the first voltage output end, and a control end of the second transistor is electrically connected with a first end of the second capacitor;
a first end of the third transistor is electrically connected with the first voltage input end, a second end of the third transistor is electrically connected with a first end of the second capacitor, and a control end of the third transistor is electrically connected with a first end of the first capacitor;
a first end of the fourth transistor is electrically connected with a first end of the second capacitor, a second end of the fourth transistor is electrically connected with the first voltage output end, and a control end of the fourth transistor is electrically connected with a first end of the first capacitor;
a second end of the first capacitor is electrically connected with the first signal input end, and a second end of the second capacitor is electrically connected with the second signal input end;
the first end of the third capacitor is electrically connected with the first voltage output end, and the second end of the third capacitor is grounded.
In one embodiment, the negative voltage generating circuit includes: a second voltage input terminal, a second voltage output terminal and a third signal input terminal;
the second voltage input end is electrically connected with the boosting circuit and used for receiving the first control voltage;
the third signal input end is electrically connected with the level shift circuit and used for receiving the second control signal;
and the negative voltage generating circuit converts the first control voltage into the second control voltage under the control of the second control signal and outputs the second control voltage through the second voltage output end.
In one embodiment, the negative voltage generating circuit further comprises: the first analog switch, the second analog switch, the third analog switch, the fourth analog switch, the inverter, the fourth capacitor and the fifth capacitor;
the first end of the first analog switch is electrically connected with the second voltage input end, the second end of the first analog switch is electrically connected with the first end of the fourth capacitor, and the control end of the first analog switch is electrically connected with the third signal input end;
a first end of the second analog switch is grounded, a second end of the second analog switch is electrically connected with a second end of the fourth capacitor, and a control end of the second analog switch is electrically connected with the third signal input end;
a first end of the third analog switch is electrically connected with a first end of the fourth capacitor, a second end of the third analog switch is electrically connected with a first end of the fifth capacitor, and a control end of the third analog switch is electrically connected with an output end of the phase inverter;
a first end of the fourth analog switch is electrically connected with a second end of the fourth capacitor, a second end of the fourth analog switch is electrically connected with the second voltage output end, and a control end of the fourth analog switch is electrically connected with an output end of the phase inverter;
the input end of the phase inverter is electrically connected with the third signal input end;
the second end of the fourth capacitor is grounded, the first end of the fifth capacitor is grounded, and the second end of the fifth capacitor is electrically connected with the second voltage output end.
In one embodiment, the larger the capacitance values of the first capacitor and the second capacitor, the stronger the loading capacity of the boost circuit.
In one embodiment, when the power supply voltage range is [1.5v,4.5v ], the first control voltage range output by the boost circuit is [2.5v,3V ], and the second control voltage range output by the negative voltage generation circuit is [ -2.5V, -3V ].
Another embodiment of the present invention provides a radio frequency switch, which includes the above control voltage generating apparatus.
The control voltage generating device and the radio frequency switch provided by the invention are electrically connected with the booster circuit through the standard voltage circuit and are used for outputting the standard voltage to the booster circuit; the oscillating circuit is electrically connected with the standard voltage circuit and used for receiving the standard voltage and outputting a first control signal to the booster circuit and the level shift circuit; the boosting circuit is used for boosting the standard voltage into a first control voltage under the control of the first control signal and outputting the first control voltage; the level shift circuit is electrically connected with the oscillation circuit and used for receiving the first control signal and converting the first control signal into a second control signal; the negative voltage generating circuit is respectively electrically connected with the booster circuit and the level shift circuit and is used for converting the first control voltage into a second control voltage under the control of a second control signal and outputting the second control voltage; the first control voltage and the second control voltage are opposite in phase; when the power supply voltage is lower, the first control voltage and the second control voltage which can drive the radio frequency switch to be switched on and off can be still output; the technical problem that the radio frequency switch cannot be normally switched when the power supply voltage is low in the prior art is solved, so that the radio frequency switch can be normally switched at low voltage, and the application range of the radio frequency switch is widened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technologies, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of an RF switch according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a control voltage generating apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a control voltage generating apparatus according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a boost circuit in the control voltage generating apparatus shown in FIGS. 2 and 3;
FIG. 5 is a schematic diagram of a negative voltage generating circuit in the control voltage generating apparatus shown in FIGS. 2 and 3;
fig. 6 is a simulation diagram of the control voltage output of the control voltage generating device of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Embodiments of the invention are given in the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
As shown in fig. 1, the rf switch 10 generally has three ports, i.e., an rf input terminal 11, an rf output terminal 12 and a control terminal 13, and the rf switch can be turned on or off by outputting a control voltage to the control terminal 13, so that the rf input terminal 11 and the rf output terminal 12 are conducted, and the control voltage of the control terminal 13 of the rf switch 10 generally needs to be between (2.5V to 3V) or (-2.5V to-3V). However, in practical use, the power voltage may be less than 3V, and the driving voltage meeting the voltage requirement cannot be provided to the control terminal 13. In order to make the rf switch 10 work normally even when the power voltage is low, the present invention provides a control voltage generating device, which can generate a device control voltage to be output to the control terminal to be superimposed with the control signal of the analog switch, so as to provide a suitable control voltage to the rf switch 10 when the power voltage is low.
Referring to fig. 2, the present invention provides a control voltage generating device, including: a standard voltage circuit 200, a booster circuit 300, an oscillation circuit 400, a level shift circuit 500, and a negative voltage generation circuit 600.
The standard voltage circuit 200 is electrically connected to the booster circuit 300, and outputs a standard voltage to the booster circuit 300. The oscillation circuit 400 is electrically connected to the standard voltage circuit 200, and is configured to receive the standard voltage and output a first control signal to the voltage boosting circuit 300 and the level shift circuit 500. The boosting circuit 300 is configured to boost the standard voltage to a first control voltage V1 and output the same under the control of the first control signal. The level shift circuit 500 is electrically connected to the oscillation circuit 400 and the voltage boost circuit 300, and is configured to receive the first control signal and convert the first control signal into a second control signal. The negative voltage generating circuit 600 is electrically connected to the boosting circuit 300 and the level shifting circuit 500, respectively, and is configured to convert the first control voltage V1 into a second control voltage V2 under the control of the second control signal and output the second control voltage V2. The first control voltage V1 and the second control voltage V2 are opposite in phase.
Further, the control voltage generating apparatus further includes a power supply 100, the power supply 100 is configured to provide a power supply voltage to the standard voltage circuit 200, and the standard voltage circuit 200 converts the power supply voltage provided by the power supply 100 into a standard voltage and outputs the standard voltage to the voltage boost circuit 300 and the oscillation circuit 400.
In the embodiment of the present invention, when the power supply voltage is low, for example, the power supply voltage is less than 3V, the standard voltage circuit 200 converts the power supply voltage into a standard voltage, for example, the standard voltage is 1.5V, and outputs the standard voltage to the booster circuit 300 and the oscillation circuit 400. The standard voltage circuit 200 may be configured to output a fixed standard voltage, that is, a fixed standard voltage is output regardless of the value of the power voltage, for example, the fixed output standard voltage is 1.5V.
The oscillation circuit 400 receives the standard voltage, generates a first control signal, and outputs the first control signal to the booster circuit 300. In one embodiment, the oscillating circuit 400 may be a ring oscillating circuit, and the first control signal may be a square wave signal, which is not limited herein. The boosting circuit 300 boosts the standard voltage to a first control voltage V1 according to the first control signal and outputs the first control voltage to the control terminal 13 of the rf switch; for example, the standard voltage of 1.5V is boosted to 3V and output to the control terminal 13 of the rf switch, so that the control voltage meets the voltage for controlling the rf switch to open. At this time, the first control voltage V1 can control the radio frequency switch to be turned on after being superimposed with the turn-on control signal sent by the analog switch.
After the first control voltage V1 is obtained, the first control voltage V1 needs to be converted into a second control voltage V2 with a phase opposite to that of the first control voltage V1, so that the radio frequency switch can be controlled to be turned off after the second control voltage V2 is superposed with a turn-off control signal sent by the analog switch. For example, when the first control voltage V1 is 3V, it is necessary to obtain the second control voltage V2 of-3V. In order to obtain the second control voltage V2, a negative voltage generating circuit 600 electrically connected to the boosting circuit 300 needs to be provided to convert the first control signal into the second control signal. In the embodiment of the present invention, the oscillating circuit 400 is electrically connected to the level shifting circuit 500, and the level shifting circuit 500 is arranged to convert the first control signal into the second control signal, so that the circuit interfaces have the same voltage domain, thereby ensuring that no current leakage occurs between the circuit interfaces. The negative voltage generating circuit 600 converts the first control voltage V1 into a second control voltage V2 under the action of the second control signal, and outputs the second control voltage V2 to the control terminal 13 of the rf switch.
In one embodiment, the level shift circuit 500 may be a PI4ULS5V102 chip, a TXS108 chip, or the like, as long as the same voltage domain can be realized between different circuit interfaces, and the invention is not limited herein.
In one embodiment, the standard voltage circuit 200 shown in fig. 3 includes: a reference voltage circuit 210 and a regulation circuit 220. The reference voltage circuit 210 is electrically connected to the voltage stabilizing circuit 220, and is configured to receive a power voltage, convert the power voltage into a reference voltage, and output the reference voltage to the voltage stabilizing circuit 220. The voltage stabilizing circuit 220 is electrically connected to the booster circuit 300, and is configured to convert the reference voltage into a standard voltage and output the standard voltage to the booster circuit 300. When the power supply voltage is low, the reference voltage circuit 210 converts the power supply voltage into a constant voltage, i.e., a reference voltage, and the stabilizing circuit 220 converts the constant voltage into a standard voltage, e.g., 1.5V.
In the embodiment of the present invention, the reference voltage circuit 210 and the regulating circuit 220 are both circuits commonly used by those skilled in the art, and are designed to generate a stable and fixed standard voltage regardless of the magnitude of the power voltage when the power voltage is a low voltage less than 3V.
In one embodiment, referring to fig. 4, the voltage boost circuit 300 includes a first voltage input terminal 301, a first voltage output terminal 302, a first signal input terminal 303, and a second signal input terminal 304. The first voltage input terminal 301 is electrically connected to the standard voltage circuit 200 for receiving a standard voltage, the first voltage output terminal 302 is for outputting a first control voltage V1, and the first signal input terminal 303 and the second signal input terminal 304 are both electrically connected to the oscillation circuit 400. The first control signal includes a first square wave signal and a second square wave signal that are opposite in phase to each other, the oscillating circuit 400 divides two paths to transmit the first square wave signal and the second square wave signal to the voltage boost circuit 300, a first signal input terminal 303 of the voltage boost circuit 300 is configured to receive the first square wave signal, and a second signal input terminal 304 of the voltage boost circuit is configured to receive the second square wave signal. The voltage boost circuit 300 converts the standard voltage into a first control voltage V1 under the control of the first square wave signal and the second square wave signal.
In one embodiment, the voltage boost circuit 300 further comprises: the circuit comprises a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a first capacitor C1, a second capacitor C2 and a third capacitor C3.
A first end of the first transistor M1 is electrically connected to the first voltage input terminal 301, a second end of the first transistor M1 is electrically connected to a first end of the first capacitor C1, and a control end of the first transistor M1 is electrically connected to a first end of the second capacitor C2.
A first end of the second transistor M2 is electrically connected to the first end of the first capacitor C1, a second end of the first transistor M1 is electrically connected to the first voltage output end 302, and a control end of the second transistor M2 is electrically connected to the first end of the second capacitor C2.
A first end of the third transistor M3 is electrically connected to the first voltage input terminal 301, a second end of the third transistor M3 is electrically connected to a first end of the second capacitor C2, and a control end of the third transistor M3 is electrically connected to a first end of the first capacitor C1;
a first end of the fourth transistor M4 is electrically connected to the first end of the second capacitor C2, a second end of the fourth transistor M4 is electrically connected to the first voltage output end 302, and a control end of the fourth transistor M4 is electrically connected to the first end of the first capacitor C1.
A second terminal of the first capacitor C1 is electrically connected to the first signal input terminal 303, and a second terminal of the second capacitor C2 is electrically connected to the second signal input terminal 304. A first terminal of the third capacitor C3 is electrically connected to the first voltage output terminal 302, and a second terminal of the third capacitor C3 is grounded.
Further, the first transistor M1, the second transistor M2, the third transistor M3, and the fourth transistor M4 may be field effect transistors. The first terminal of the first transistor M1 may be a source, the second terminal may be a drain, and the control terminal may be a gate; optionally, the first terminal of the first transistor M1 may also be a drain, the second terminal may be a source, and the control terminal may be a gate. The arrangement of the first, second and control terminals of the second, third and fourth transistors M2, M3 and M4 is similar to that of the first transistor M1.
Optionally, the first transistor M1 and the third transistor M3 are NMOS transistors, and the second transistor M2 and the fourth transistor M4 are PMOS transistors.
By connecting the oscillation circuit 400 with the coupling capacitors, i.e., the first capacitor C1 and the second capacitor C2, control signals with alternating high and low levels can be generated to control the first transistor M1, the second transistor M2, the third transistor M3 and the fourth transistor M4 to be turned on and off. When the oscillation circuit 400 divides into two paths to output a first square wave signal and a second square wave signal to the first signal input end 303 and the second signal input end 304 respectively, and the first transistor M1 and the fourth transistor M4 are turned on, the second transistor M2 and the third transistor M3 are turned off, at this time, the first capacitor C1 is charged, and the charging voltage of the first capacitor C1 is a standard voltage; when the first transistor M1 and the fourth transistor M4 are turned off, the second transistor M2 and the third transistor M3 are turned on, the first capacitor C1 is in a discharging state, the second capacitor C2 is in a charging state, and the third capacitor C3 is also in a charging state. By adjusting the first square wave signal and the second square wave signal (i.e., the first control signal), the magnitude of the first control voltage V1 is the sum of the standard voltage and the voltage at the two ends of the first capacitor C1, which is twice the standard voltage. For example, when the standard voltage is 1.5V, the first control voltage V1 is 3V. In this embodiment, the third capacitor C3 also has the function of stabilizing the first control voltage V1.
In addition, in the embodiment of the present invention, the capacitance of the first capacitor C1 and the second capacitor C2 is increased, so that the power efficiency and the driving capability of the voltage boost circuit 300 can be improved.
In one embodiment, referring to fig. 5, the negative voltage generating circuit 600 includes: a second voltage input 601, a second voltage output 602, and a third signal input 603. The second voltage input terminal 601 is electrically connected to the voltage boosting circuit 300, and is configured to receive the first control voltage V1. The third signal input terminal 603 is electrically connected to the level shift circuit 500 for receiving a second control signal. The negative voltage generating circuit 600 converts the first control voltage V1 into a second control voltage V2 under the control of the second control signal, and outputs the second control voltage V2 through a second voltage output terminal 602.
The negative voltage generation circuit 600 further includes: the circuit comprises a first analog switch S1, a second analog switch S2, a third analog switch S3, a fourth analog switch S4, an inverter 610, a fourth capacitor C4 and a fifth capacitor C5.
The first end of the first analog switch S1 is electrically connected to the second voltage input 601, the second end of the first analog switch S1 is electrically connected to the first end of the fourth capacitor C4, the second end of the first analog switch S1 is also electrically connected to the first end of the third analog switch S3, and the control end of the first analog switch S1 is electrically connected to the third signal input 603.
A first end of the second analog switch S2 is grounded, a second end of the second analog switch S2 is electrically connected to a second end of the fourth capacitor C4, a second end of the second analog switch S2 is also electrically connected to a first end of the fourth analog switch S4, and a control end of the second analog switch S2 is electrically connected to the third signal input terminal 603.
A first end of the third analog switch S3 is electrically connected to a first end of the fourth capacitor C4, a second end of the third analog switch S3 is electrically connected to a first end of the fifth capacitor C5, a second end of the third analog switch S3 is further grounded, and a control end of the third analog switch S3 is electrically connected to the output end 612 of the inverter 610.
A first end of the fourth analog switch S4 is electrically connected to the second end of the fourth capacitor C4, a second end of the fourth analog switch S4 is electrically connected to the second voltage output end 602, a second end of the fourth analog switch S4 is also electrically connected to the second end of the fifth capacitor C5, and a control end of the fourth analog switch S4 is electrically connected to the output end 612 of the inverter 610.
An input 611 of the inverter 610 is electrically connected to the third signal input 603. The second terminal of the fourth capacitor C4 is grounded, the first terminal of the fifth capacitor C5 is grounded, and the second terminal of the fifth capacitor C5 is electrically connected to the second voltage output terminal 602.
The first analog switch S1, the second analog switch S2, the third analog switch S3, and the fourth analog switch S4 may be field effect transistors, the first end of the first analog switch S1 may be a source, the second end may be a drain, and the control end may be a gate; optionally, the first end of the first analog switch S1 may also be a drain, the second end may be a source, and the control end may be a gate. The first, second and control terminals of the second, third and fourth analog switches S2, S3 and S4 are arranged similarly to the first transistor M1.
When the level shift circuit 500 converts the first control signal into the second control signal and outputs the second control signal to the third signal input terminal 603, the second control signal directly flows to the control terminals of the first analog switch S1 and the second analog switch S2, and then the second control signal is inverted by the inverter 610 and flows to the third analog switch S3 and the fourth analog switch S4. In addition, under the control of a second control signal, when the first analog switch S1 and the second analog switch S2 are turned on, the third analog switch S3 and the fourth analog switch S4 are turned off, the fourth capacitor C4 is in a charging state, and the charging voltage is the first control voltage V1; when the first analog switch S1 and the second analog switch S2 are turned off, the third analog switch S3 and the fourth analog switch S4 are turned on, the fourth capacitor C4 discharges to the fifth capacitor C5, the fifth capacitor C5 is in a charging state, the charging voltage is a second control voltage V2, the second control voltage V2 is in a phase opposite to the first control voltage V1, for example, the first control voltage V1 is 3V, and then the second control voltage V2 is-3V. The oscillating circuit 400 outputs a second control signal to the negative voltage generating circuit 600 through the level shifting circuit 500 at a predetermined frequency to control the four analog switches to be turned on and off, so that the first control voltage V1 can be converted into a second control voltage V2.
In addition, the capacitance of the fourth capacitor C4 and the fifth capacitor C5 is increased, so that the driving capability of the negative voltage generating circuit 600 can be improved.
It should be noted that, with reference to fig. 5, when the power voltage range is [1.5v,4.5v ], the first control voltage V1 output by the boost circuit 300 is [2.5v,3V ], and the second control voltage V2 output by the negative voltage generation circuit 600 is [ -2.5V, -3V ]. For example, when the power supply voltage is 1.5V, the first control voltage V1 output from the voltage boosting circuit 300 is 3V, and the second control voltage V2 output from the negative voltage generating circuit 600 is-3V.
In summary, the control voltage generating apparatus provided by the present invention is electrically connected to the voltage boost circuit 300 through the standard voltage circuit 200, and is configured to output the standard voltage to the voltage boost circuit 300; the oscillation circuit 400 is electrically connected to the standard voltage circuit 200, and is configured to receive a standard voltage and output a first control signal to the voltage boosting circuit 300 and the level shift circuit 500; the boosting circuit 300 is configured to boost the standard voltage into a first control voltage V1 and output the first control voltage V1 under the control of the first control signal; the level shift circuit 500 is electrically connected to the oscillation circuit 400, and is configured to receive a first control signal and convert the first control signal into a second control signal; the negative voltage generating circuit 600 is electrically connected to the voltage boosting circuit 300 and the level shifting circuit 500, and is configured to convert the first control voltage V1 into a second control voltage V2 under the control of the second control signal and output the second control voltage V2; the first control voltage V1 and the second control voltage V2 are opposite in phase; when the power supply voltage is lower, the first control voltage V1 and the second control voltage V2 which can drive the radio frequency switch to be switched on and off can be still output; the technical problem that the radio frequency switch cannot be normally switched when the power supply voltage is low in the prior art is solved, so that the radio frequency switch can be normally switched at low voltage, and the application range of the radio frequency switch is widened.
The invention also provides a radio frequency switch which comprises the control voltage generating device, wherein the control voltage generating device outputs a first control voltage V1 and a second control voltage V2 to the control end of the radio frequency switch, and the control voltage V1 and the second control voltage V2 can control the radio frequency switch to be switched on and off after being superposed with a control signal for controlling the radio frequency switch. When the power supply voltage is lower, the control signal is superposed with the first control voltage V1 and the second control voltage V2 to control the radio frequency switch.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases or other media used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A control voltage generation device, characterized by comprising: the circuit comprises a standard voltage circuit, a booster circuit, an oscillation circuit, a level shift circuit and a negative voltage generating circuit;
the standard voltage circuit is electrically connected with the booster circuit and is used for outputting standard voltage to the booster circuit;
the oscillation circuit is electrically connected with the standard voltage circuit and used for receiving the standard voltage and outputting a first control signal to the boosting circuit and the level shifting circuit;
the boosting circuit is used for boosting the standard voltage into a first control voltage under the control of the first control signal and outputting the first control voltage;
the level shift circuit is electrically connected with the oscillation circuit and is used for receiving the first control signal and converting the first control signal into a second control signal;
the negative voltage generating circuit is respectively electrically connected with the booster circuit and the level shift circuit and is used for converting the first control voltage into a second control voltage under the control of the second control signal and outputting the second control voltage;
the first control voltage and the second control voltage are opposite in phase.
2. The control voltage generation apparatus according to claim 1, further comprising a power supply;
the power supply is used for supplying a power supply voltage to the standard voltage circuit;
the standard voltage circuit is used for converting the power supply voltage into the standard voltage and outputting the standard voltage to the booster circuit and the oscillation circuit.
3. The control voltage generation apparatus according to claim 2, wherein the standard voltage circuit includes: a reference voltage circuit and a voltage stabilizing circuit;
the reference voltage circuit is electrically connected with the voltage stabilizing circuit and used for receiving the power voltage, converting the power voltage into reference voltage and outputting the reference voltage to the voltage stabilizing circuit;
the voltage stabilizing circuit is electrically connected with the booster circuit and used for converting the reference voltage into a standard voltage and outputting the standard voltage to the booster circuit.
4. The control voltage generation device according to any one of claims 1 to 3, wherein the booster circuit includes a first voltage input terminal, a first voltage output terminal, a first signal input terminal, and a second signal input terminal;
the first voltage input end is electrically connected with the standard voltage circuit and used for receiving the standard voltage;
the first voltage output end is used for outputting the first control voltage;
the first signal input end and the second signal input end are both electrically connected with the oscillating circuit;
the first control signal comprises a first square wave signal and a second square wave signal which are opposite in phase, the first signal input end is used for receiving the first square wave signal, and the second signal input end is used for receiving the second square wave signal.
5. The control voltage generation device according to claim 4, wherein the booster circuit further includes: the circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor and a third capacitor;
a first end of the first transistor is electrically connected with the first voltage input end, a second end of the first transistor is electrically connected with a first end of the first capacitor, and a control end of the first transistor is electrically connected with a first end of the second capacitor;
a first end of the second transistor is electrically connected with a first end of the first capacitor, a second end of the first transistor is electrically connected with the first voltage output end, and a control end of the second transistor is electrically connected with a first end of the second capacitor;
a first end of the third transistor is electrically connected with the first voltage input end, a second end of the third transistor is electrically connected with a first end of the second capacitor, and a control end of the third transistor is electrically connected with a first end of the first capacitor;
a first end of the fourth transistor is electrically connected with a first end of the second capacitor, a second end of the fourth transistor is electrically connected with the first voltage output end, and a control end of the fourth transistor is electrically connected with a first end of the first capacitor;
a second end of the first capacitor is electrically connected with the first signal input end, and a second end of the second capacitor is electrically connected with the second signal input end;
the first end of the third capacitor is electrically connected with the first voltage output end, and the second end of the third capacitor is grounded.
6. The control voltage generation device according to any one of claims 1 to 3, wherein the negative voltage generation circuit includes: a second voltage input terminal, a second voltage output terminal and a third signal input terminal;
the second voltage input end is electrically connected with the boosting circuit and used for receiving the first control voltage;
the third signal input end is electrically connected with the level shift circuit and used for receiving the second control signal;
and the negative voltage generating circuit converts the first control voltage into the second control voltage under the control of the second control signal and outputs the second control voltage through the second voltage output end.
7. The control voltage generation device according to claim 6, wherein the negative voltage generation circuit further comprises: the first analog switch, the second analog switch, the third analog switch, the fourth analog switch, the inverter, the fourth capacitor and the fifth capacitor;
the first end of the first analog switch is electrically connected with the second voltage input end, the second end of the first analog switch is electrically connected with the first end of the fourth capacitor, and the control end of the first analog switch is electrically connected with the third signal input end;
a first end of the second analog switch is grounded, a second end of the second analog switch is electrically connected with a second end of the fourth capacitor, and a control end of the second analog switch is electrically connected with the third signal input end;
a first end of the third analog switch is electrically connected with a first end of the fourth capacitor, a second end of the third analog switch is electrically connected with a first end of the fifth capacitor, and a control end of the third analog switch is electrically connected with an output end of the phase inverter;
a first end of the fourth analog switch is electrically connected with a second end of the fourth capacitor, a second end of the fourth analog switch is electrically connected with the second voltage output end, and a control end of the fourth analog switch is electrically connected with an output end of the phase inverter;
the input end of the phase inverter is electrically connected with the third signal input end;
the second end of the fourth capacitor is grounded, the first end of the fifth capacitor is grounded, and the second end of the fifth capacitor is electrically connected with the second voltage output end.
8. The control voltage generating apparatus according to claim 5, wherein the larger the capacitance values of the first capacitor and the second capacitor are, the stronger the on-load capacity of the booster circuit is.
9. The control voltage generation device according to claim 2, wherein when the power supply voltage range is [1.5v,4.5v ], the first control voltage range output by the boost circuit is [2.5v,3v ], and the second control voltage range output by the negative voltage generation circuit is [ -2.5V, -3V ].
10. A radio frequency switch, characterized in that it comprises a control voltage generating device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111420527.6A CN114244333B (en) | 2021-11-26 | 2021-11-26 | Control voltage generating device and radio frequency switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111420527.6A CN114244333B (en) | 2021-11-26 | 2021-11-26 | Control voltage generating device and radio frequency switch |
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| CN114244333A CN114244333A (en) | 2022-03-25 |
| CN114244333B true CN114244333B (en) | 2023-01-10 |
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| US6040707A (en) * | 1997-09-15 | 2000-03-21 | Intersil Corporation | Constant slew rate amplifier |
| KR20140105932A (en) * | 2013-02-25 | 2014-09-03 | 삼성전자주식회사 | Voltage level conversion circuit and display device including the same |
| US10630160B2 (en) * | 2018-04-24 | 2020-04-21 | Texas Instruments Incorporated | Gate drive adapter |
| CN113050507B (en) * | 2021-03-26 | 2022-02-01 | 广州穗源微电子科技有限公司 | Control circuit applied to low power supply voltage radio frequency switch |
| CN113300600B (en) * | 2021-05-27 | 2023-01-24 | 广州大学 | Pre-boosting circuit of boosting conversion circuit |
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