CN110739918B - Radio frequency amplifier - Google Patents
Radio frequency amplifier Download PDFInfo
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- CN110739918B CN110739918B CN201810790550.6A CN201810790550A CN110739918B CN 110739918 B CN110739918 B CN 110739918B CN 201810790550 A CN201810790550 A CN 201810790550A CN 110739918 B CN110739918 B CN 110739918B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a radio frequency amplifier. The radio frequency amplifier converts the voltage output by the bias power supply into the input bias voltage by arranging the voltage conversion network between the input bias network and the bias power supply, so that a single power supply can simultaneously provide the input bias voltage and the output bias voltage for the radio frequency amplifier. And the output control signal of the signal output end is controlled by the voltage conversion network to control the conduction of the switch circuit, so that the voltage output by the bias power supply is transmitted to the input end of the output bias network through the control switch circuit, and the output bias network is provided for the depletion-mode amplifier device. Therefore, the output bias network can provide the output bias network for the depletion type amplifier device only after the input bias voltage of the input bias network is loaded to the input end of the depletion type amplifier device, and the phenomenon that the device is burnt due to the fact that the output bias current is too large due to too high input bias voltage is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of wireless communication, in particular to a radio frequency amplifier.
Background
In the fields of wireless communication, radar, millimeter wave and the like, a radio frequency power amplifier is an essential core link in related equipment. The rf power amplifier needs to provide a proper bias voltage when operating. The input bias voltage of the radio frequency power amplifier is loaded on the input end of the amplifier device through the input bias network, and the output bias voltage is loaded on the output end of the amplifier device through the output bias network, so that the proper input bias voltage and output bias voltage are the premise that the radio frequency power amplifier normally works. The input bias of the depletion type radio frequency power amplifier is negative voltage, and the output bias is positive voltage. The input bias voltage of the depletion type radio frequency power amplifier needs deeper negative bias to close the depletion type radio frequency power amplifier, so that the depletion type radio frequency power amplifier is in an on state under the condition that the input end has no input, the voltage of the input end is zero and is far higher than the threshold voltage of the depletion type radio frequency power amplifier during normal operation, and if the output bias voltage is provided for the output end of the radio frequency power amplifier, overlarge output current is generated due to the overhigh input bias voltage of the output end, and the radio frequency amplifier is burnt.
Disclosure of Invention
The invention provides a radio frequency amplifier, which is used for providing an output bias voltage after the preparation of the input bias voltage of the radio frequency amplifier is finished, and ensuring the time sequence of the input bias voltage and the output bias voltage, thereby avoiding the phenomenon that the radio frequency amplifier is burnt.
In a first aspect, an embodiment of the present invention provides a radio frequency amplifier, including an input bias network, a depletion mode amplifier device, an output bias network, a voltage conversion network, a control switch circuit, and a bias power supply;
the output end of the input bias network is electrically connected with the input end of the depletion mode amplifier device;
the output end of the output bias network is electrically connected with the output end of the depletion mode amplifier device;
the voltage conversion network comprises an input end, an output end and a control signal output end, wherein the input end of the voltage conversion network is electrically connected with the output end of the bias power supply, and the output end of the voltage conversion network is electrically connected with the input end of the input bias network; the voltage conversion network is used for converting the power supply voltage output by the bias power supply output end into the input bias voltage of the input bias network;
the control switch circuit comprises a first end, a second end and a control end, the control end of the control switch circuit is electrically connected with the control signal output end of the voltage conversion network, the first end of the control switch circuit is electrically connected with the output end of the bias power supply, and the second end of the control switch circuit is electrically connected with the input end of the output bias network; the control switch circuit is used for transmitting the power supply voltage output by the bias power supply output end to the input end of the output bias network according to the control signal output by the control signal output end of the voltage conversion network.
Specifically, the voltage conversion network comprises a voltage conversion chip and a control signal output circuit;
the voltage conversion chip comprises a first voltage input end, a voltage output end and a voltage control end, wherein the first voltage input end of the voltage conversion chip is used as the input end of the voltage conversion network, and the voltage output end of the voltage conversion chip is used as the output end of the voltage conversion network; the voltage conversion chip converts the power supply voltage output by the bias power supply output end into the input bias voltage of the input bias network;
a control signal input end of the control signal output circuit is electrically connected with a voltage control end of the voltage conversion chip, an input end of the control signal output circuit is electrically connected with an output end of the bias voltage, and an output end of the control signal output circuit is used as a control signal output end of the voltage conversion network; the control signal output circuit is used for outputting the control signal after the voltage control end of the voltage conversion chip outputs the signal.
Specifically, the voltage conversion chip further comprises a second voltage input terminal and a switching transistor;
the control end of the switch transistor is electrically connected with the voltage output end of the voltage conversion chip, the first end of the switch transistor is electrically connected with the second voltage input end, and the second end of the switch transistor is used as the voltage control end of the voltage conversion chip.
Specifically, the switching transistor is a P-type transistor.
Specifically, the voltage conversion network further comprises a voltage dividing sub-circuit;
the first input end of the voltage dividing sub-circuit is electrically connected with the output end of the bias power supply, the second input end of the voltage dividing sub-circuit is grounded, and the output end of the voltage dividing sub-circuit is electrically connected with the second voltage input end of the voltage conversion chip;
the voltage division sub-circuit is used for dividing the voltage output by the bias power supply and then inputting the divided voltage to the second voltage input end of the voltage conversion chip.
Specifically, the voltage dividing sub-circuit comprises a first voltage dividing resistor and a second voltage dividing resistor;
a first terminal of the first voltage-dividing resistor is used as a first input terminal of the voltage-dividing sub-circuit, a second terminal of the first voltage-dividing resistor is electrically connected to a first terminal of the second voltage-dividing resistor, the first terminal of the second voltage-dividing resistor is used as an output terminal of the voltage-dividing sub-circuit, and the second terminal of the second voltage-dividing resistor is used as a second input terminal of the voltage-dividing sub-circuit.
Specifically, the control signal output circuit comprises a first transistor, a first resistor, a second resistor, a third resistor and a first capacitor;
a first end of the first resistor is used as a control signal input end of the control signal output circuit, and a second end of the first resistor is electrically connected with a control end of the first transistor;
the first end of the first capacitor is electrically connected with the first end of the first resistor, and the second end of the first capacitor is grounded;
the first end of the first transistor is electrically connected with the first end of the second resistor, and the second end of the first transistor is grounded;
the second end of the second resistor is electrically connected with the first end of the third resistor, the second end of the third resistor is electrically connected with the output end of the bias power supply, and the second end of the second resistor is used as the output end of the control signal output circuit.
Specifically, the radio frequency amplifier further comprises a signal input end, a signal output end, an input matching network and an output matching network;
the input end of the input matching network is electrically connected with the signal input end, and the output end of the input matching network is electrically connected with the input end of the depletion-mode amplifier device;
the input end of the output matching network is electrically connected with the output end of the depletion type amplifier device, and the output end of the output matching network is electrically connected with the signal output end.
Specifically, the control switch circuit is a first control switch, the first control switch includes a first end, a second end and a control end, and the first control switch switches on or off the first end and the second end according to the voltage of the control end;
the control end of the first control switch is used as the control end of the control switch circuit, the first end of the first control switch is used as the first end of the control switch circuit, and the second end of the first control switch is used as the second end of the control switch circuit.
Specifically, the bias power supply is a direct current power supply, and the voltage output by the bias power supply is greater than the voltage output by the output end of the voltage conversion network.
The invention converts the voltage output by the bias power supply into the input bias voltage by arranging the voltage conversion network between the input bias network and the bias power supply, realizes that a single power supply simultaneously provides the input bias voltage and the output bias voltage for the radio frequency amplifier, and reduces the number of the power supplies. And the voltage conversion network control signal output end outputs a control signal to control the switch circuit to be conducted, so that the voltage output by the bias power supply is transmitted to the input end of the output bias network through the control switch circuit, and the output bias voltage is provided for the depletion-mode amplifier device. Therefore, the output bias network can provide the output bias voltage for the depletion type amplifier device only after the input bias voltage of the input bias network is loaded to the input end of the depletion type amplifier device, and the phenomenon that the device is burnt due to the fact that overlarge output current is generated due to the fact that the input bias voltage is overhigh is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a radio frequency amplifier according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage conversion network according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a voltage conversion chip and a peripheral circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another voltage conversion network according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another voltage conversion network according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another rf amplifier provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another radio frequency amplifier according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of an rf amplifier according to an embodiment of the present invention, and as shown in fig. 1, the rf amplifier includes an input bias network 110, a depletion-mode amplifier device 120, an output bias network 130, a voltage conversion network 140, a control switch circuit 150, and a bias power supply 160. The output terminal Vout1 of the input bias network 110 is electrically connected to the input terminal Vin2 of the depletion-mode amplifier device 120; the output terminal Vout3 of the output bias network 130 is electrically connected to the output terminal Vout2 of the depletion mode amplifier device 120.
The voltage conversion network 140 includes an input terminal Vin4, an output terminal Vout4, and a control signal output terminal Kout, the input terminal Vin4 of the voltage conversion network 140 is electrically connected to the output terminal Vout6 of the bias power supply 160, and the output terminal Vout4 of the voltage conversion network 140 is electrically connected to the input terminal Vin1 of the input bias network 110. The voltage conversion network 140 is used to convert the power supply voltage output by the output terminal Vout6 of the bias power supply 160 into the input bias voltage of the input bias network 110.
The control switch circuit 150 includes a first terminal a1, a second terminal a2, and a control terminal Kin, the control terminal Kin of the control switch circuit 150 is electrically connected to the control signal output terminal Kout of the voltage conversion network 140, the first terminal a1 of the control switch circuit 150 is electrically connected to the output terminal Vout6 of the bias power supply 160, and the second terminal a2 of the control switch circuit 150 is electrically connected to the input terminal Vin3 of the output bias network 130; the control switch circuit 150 is used for transmitting the power voltage outputted from the output terminal Vout6 of the bias power supply 160 to the input terminal Vin3 of the output bias network 130 according to the control signal outputted from the control signal output terminal Kout of the voltage conversion network 140.
Specifically, as shown in fig. 1, the input bias network 110 provides an input bias voltage to the depletion mode amplifier device 120 to control the operating state of the depletion mode amplifier device 120. Output bias network 130 provides an output bias voltage for depletion amplifier device 120 and provides the power required for operation of depletion amplifier device 120. The depletion mode amplifier device 120 has an input bias threshold voltage, and when the input bias voltage is lower than the input bias threshold voltage, the depletion mode amplifier device 120 is in an off state, and at this time, no current is output from the output terminal Vout2 of the depletion mode amplifier device 120, and the depletion mode amplifier device 120 cannot amplify signals; when the input bias voltage is higher than the input bias threshold voltage, the depletion mode amplifier device 120 is turned on, and the current starts to flow from the output terminal Vout2 of the depletion mode amplifier device 120, so that the depletion mode amplifier device 120 can operate normally. After the input bias voltage is higher than the input bias threshold voltage, the higher the input bias voltage, the higher the current at the output terminal Vout2 of the depletion amplifier device 120, and the greater the amplification of the depletion amplifier device 120.
The input bias network 110 and the output bias network 130 share a bias supply 160. The voltage output by the output terminal Vout6 of the bias supply 160 provides voltage to both the input bias network 110 and the output bias network 130. The bias power supply 160 generates a negative voltage through the voltage converting network 140 and inputs the negative voltage into the bias network 110, and the input bias network 110 decouples and adjusts the negative voltage output by the voltage converting network 140 and outputs the input bias voltage to the input terminal Vin2 of the depletion-mode amplifier device 120. The bias power supply 160 controls whether the voltage output by the bias power supply 160 is provided to the output bias network 130 by controlling the switch circuit 150, and when the switch circuit 150 is turned on, the output bias network 130 performs decoupling, adjustment and the like on the voltage provided by the bias power supply 160 to form an output bias voltage and output the output bias voltage to the output terminal Vout2 of the depletion mode amplifier device 120.
Typically, the bias power supply 160 is a dc power supply, and the voltage output by the bias power supply 160 is a positive voltage. The input bias voltage of the input bias network 110 corresponding to the depletion-mode amplifier device 120 is negative, and the output bias voltage of the output bias network 120 is positive, so that the voltage conversion network 140 is required to convert the voltage output from the output terminal Vout6 of the bias power supply 160 so as to provide the input bias voltage for the input bias network 110. The voltage output by the bias power supply 160 is a positive voltage, which is greater than the negative voltage output by the output terminal of the voltage converting network 140, so that the voltage converting network 140 implements voltage reduction.
The rf amplifier further includes a signal input terminal Vin and a signal output terminal Vout, the signal input terminal Vin is electrically connected to the input terminal Vin2 of the depletion mode amplifier device 120, the input terminal Vin inputs an input signal to be amplified and transmits the input signal to the input terminal Vin2 of the depletion mode amplifier device, and the signal output terminal Vout is electrically connected to the output terminal Vout2 of the depletion mode amplifier device 120 to output the amplified input signal. Before a signal is input at the signal input terminal Vin, the voltage at the input terminal Vin2 of the depletion amplifier device 120 is zero, at this time, the depletion amplifier device 120 is in a conducting state and is much higher than the input bias threshold voltage when the depletion amplifier device 120 normally operates (generally, the threshold voltage when the depletion amplifier device 120 normally operates is a negative voltage), if the output bias voltage is provided by the output bias network 130, the current output by the output terminal Vout2 of the depletion amplifier device 120 is very large, which causes the depletion amplifier device 120 to burn out. Therefore, it is necessary to ensure that the input bias voltage of the input bias network 110 is negative before providing the output bias voltage to the output bias network 130, so as to avoid burning out the device.
In this process, the output bias network 130 is connected to a bias power supply 160 through a control switch circuit 150. When the control switch circuit 150 is turned on, the voltage output by the bias power supply 160 is transmitted to the input terminal Vin3 of the output bias network 130 to provide a positive voltage to the output bias network 130. The control signal output terminal Kout of the voltage converting network 140 is electrically connected to the control terminal Kin of the control switch circuit 150. When the output terminal Vout4 of the voltage transformer network 140 outputs the input bias voltage of the input bias network 110, the control signal output terminal Kout of the voltage transformer network 140 outputs a control signal to the control terminal Kin of the control switch circuit 150 to control the conduction thereof, so as to transmit the positive voltage output by the bias power supply 160 to the input terminal Vin3 of the output bias network 130, and the output bias network 130 decouples and adjusts the positive voltage to form an output bias voltage, and transmits the output bias voltage to the output terminal Vout2 of the depletion-type amplifier device 120. Therefore, the output bias network 130 can provide the output bias voltage for the depletion mode amplifier device 120 only after the input bias voltage of the input bias network 110 is loaded to the input terminal Vin2 of the depletion mode amplifier device 120, so that the phenomenon that the device is burnt due to the fact that the output current is too large because of too high input bias voltage is avoided.
According to the technical scheme of the embodiment, the voltage conversion network is arranged between the input bias network and the bias power supply, the voltage output by the bias power supply is converted into the input bias voltage, a single power supply simultaneously provides the input bias voltage and the output bias voltage for the radio frequency amplifier, and the number of the power supplies is reduced. And the voltage conversion network control signal output end outputs a control signal to control the switch circuit to be conducted, so that the voltage output by the bias power supply is transmitted to the input end of the output bias network through the control switch circuit, and the output bias voltage is provided for the depletion-mode amplifier device. Therefore, the output bias network can provide the output bias voltage for the depletion type amplifier device only after the input bias voltage of the input bias network is loaded to the input end of the depletion type amplifier device, and the phenomenon that the device is burnt due to the fact that the output bias voltage is too high and too large output current is generated is avoided.
On the basis of the above technical solution, fig. 2 is a schematic structural diagram of a voltage conversion network according to an embodiment of the present invention, and with reference to fig. 1 and fig. 2, the voltage conversion network 140 includes a voltage conversion chip 141 and a control signal output circuit 142. The voltage converting chip 141 includes a first voltage input terminal in1, a voltage output terminal out1 and a voltage control terminal Cout, the first voltage input terminal in1 of the voltage converting chip 141 serves as the input terminal Vin4 of the voltage converting network 140, and the voltage output terminal out1 of the voltage converting chip 141 serves as the output terminal Vout4 of the voltage converting network 140. The voltage conversion chip 141 converts the supply voltage output by the output terminal Vout6 of the bias power supply 160 into an input bias voltage for the input bias network 110.
A control signal input terminal Cin of the control signal output circuit 142 is electrically connected to the voltage control terminal Cout of the voltage conversion chip 141, and an output terminal out2 of the control signal output circuit 142 serves as a control signal output terminal Kout of the voltage conversion network 140; the control signal output circuit 142 is configured to output a control signal after the voltage control terminal Cout of the voltage conversion chip 141 outputs a signal.
Fig. 3 is a schematic circuit diagram of a voltage conversion chip and a peripheral circuit according to an embodiment of the present invention, as shown in fig. 3, a model of the voltage conversion chip 141 may be TPS54260DGQ, and at this time, a PWRGD pin on the TPS54260DGQ is a voltage control terminal Cout of the voltage conversion chip 141. In addition, in order to make the chip TPS54260DGQ work normally, the periphery of the chip TPS54260DGQ also includes other circuits or elements, and is electrically connected with other pins on the chip TPS54260 DGQ. For example, an output inductor L1 is connected in series between the output terminal out1 and ground for storing electric energy while reducing ripple of the output current, thereby smoothing the output current. The freewheeling diode D1 is connected between the pH pin and the GND pin, and functions as freewheeling when the current flowing through the output inductor L1 is turned off when the internal power supply of the chip TPS54260DGQ is turned off. The start capacitor Cst is connected between the pH pin and the Boot pin, and provides a gate drive voltage for the transistors of the Boot generator inside the chip TPS54260 DGQ. In addition, a compensation circuit 1411 is connected to the comp pin to compensate the output voltage and stabilize the output voltage when the output voltage of the voltage conversion chip 141 is unstable. The two parallel capacitors connected to the pH pin and the GND pin form a filter circuit 1412 for filtering harmonic components in the output voltage of the voltage conversion chip 141.
Specifically, when the output terminal out1 of the voltage converting chip 141 outputs no voltage or the output voltage is not the input bias voltage, the voltage control terminal Cout does not output a signal, the control signal output circuit 142 does not output a control signal, and the control switch circuit 150 is in the off state. When the voltage output by the output terminal out1 of the voltage conversion chip 141 is the input bias voltage, the voltage control terminal Cout outputs a signal, the control signal output circuit 142 outputs a control signal, and the control switch circuit 150 is turned on, so that the voltage output by the output terminal Vout6 of the bias power supply 160 can be loaded to the output bias network 130 through the control switch circuit 150.
On the basis of the above technical solution, with continuing reference to fig. 1 and fig. 2, the voltage conversion chip 141 further includes a second voltage input terminal in2 and a switching transistor Q. The control terminal ctrl of the switching transistor Q is electrically connected to the voltage output terminal out1 of the voltage converting chip 141, the first terminal a of the switching transistor Q is electrically connected to the second voltage input terminal in2, and the second terminal B of the switching transistor Q serves as the voltage control terminal Cout of the voltage converting chip 141.
Specifically, the input bias voltage of the depletion-mode amplifier device is negative, and the voltage provided by the bias power supply 160 is generally positive, so that the voltage conversion chip 141 converts the positive voltage into the negative voltage, and the voltage output by the output end out1 of the voltage conversion chip 141 is low. The switching transistor Q may be set to a P-type transistor at this time. When the output terminal out1 of the voltage converting chip 141 outputs no voltage or outputs a high level, the switching transistor Q is not turned on, and the voltage control terminal Cout of the voltage converting chip 141 outputs no signal. When the output terminal out1 of the voltage converting chip 141 outputs a low level, the switching transistor Q is controlled to be turned on, and the switching transistor Q transmits the voltage input from the second voltage input terminal in2 of the voltage converting chip 141 to the voltage control terminal Cout of the voltage converting chip 141, and outputs the voltage input from the second voltage input terminal in 2.
On the basis of the above technical solution, fig. 4 is a schematic structural diagram of another voltage conversion network provided in an embodiment of the present invention, and as shown in fig. 4, the voltage conversion network further includes a voltage division sub-circuit 143. The first input terminal C of the voltage divider sub-circuit 143 is electrically connected to the output terminal Vout6 of the bias power supply 160, the second input terminal D of the voltage divider sub-circuit 143 is grounded, and the output terminal E of the voltage divider sub-circuit 143 is electrically connected to the second voltage input terminal in2 of the voltage converting chip 141. The voltage divider circuit 143 is configured to divide the voltage output by the bias power supply 160 and input the divided voltage to the second voltage input terminal in2 of the voltage conversion chip 141.
Specifically, the voltage dividing sub-circuit 143 includes a first voltage dividing resistance Rt1 and a second voltage dividing resistance Rt 2. A first terminal of the first voltage-dividing resistor Rt1 serves as a first input terminal C of the voltage-dividing sub-circuit 143, a second terminal of the first voltage-dividing resistor Rt1 is electrically connected to a first terminal of the second voltage-dividing resistor Rt2, a first terminal of the second voltage-dividing resistor Rt2 serves as an output terminal E of the voltage-dividing sub-circuit 143, and a second terminal of the second voltage-dividing resistor Rt2 serves as a second input terminal D of the voltage-dividing sub-circuit. The first voltage-dividing resistor Rt1 and the second voltage-dividing resistor Rt2 in the voltage-dividing sub-circuit 143 are connected in series, divide the voltage output by the bias power supply 160, and output the voltage across the second voltage-dividing resistor Rt2 as an output voltage to the second voltage input terminal in2 of the voltage conversion chip 141.
Based on the above technical solutions, fig. 5 is a schematic structural diagram of another voltage conversion network provided in the embodiment of the present invention, and as shown in fig. 5, the control signal output circuit 142 includes a first transistor T1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1. A first terminal a of the first resistor R1 is used as a control signal input terminal Cin of the control signal output circuit 142, and a second terminal b of the first resistor is electrically connected to a control terminal c of the first transistor T1; the first terminal f of the first capacitor C1 is electrically connected to the first terminal a of the first resistor R1, and the second terminal g of the first capacitor C1 is grounded. The first terminal d of the first transistor T1 is electrically connected to the first terminal k of the second resistor R2, and the second terminal e of the first transistor T1 is grounded; the second terminal m of the second resistor R2 is electrically connected to the first terminal n of the third resistor R3, the second terminal p of the third resistor R3 is electrically connected to the output terminal Vout6 of the bias power supply 160, and the second terminal m of the second resistor R2 is used as the output terminal out2 of the control signal output circuit 142.
Specifically, after the voltage control terminal Cout of the voltage conversion chip 141 outputs a signal, the signal is loaded to the control terminal of the first transistor T1 through the first resistor R1, and the first transistor T1 is controlled to be turned on, and at this time, the second resistor R2, the third resistor R3 and the first transistor T1 form a loop. Since the second terminal e of the first transistor T1 is grounded, and the second terminal p of the third resistor R3 is electrically connected to the output terminal Vout6 of the bias power supply 160, the second resistor R2 and the third resistor R3 divide the voltage output from the output terminal Vout6 of the bias power supply 160, and output the voltage across the second resistor R2 as a control signal from the output terminal out2 of the control signal output circuit 142, thereby controlling the on state of the control switch circuit.
On the basis of the above technical solutions, fig. 6 is a schematic structural diagram of another radio frequency amplifier provided in the embodiment of the present invention, and with reference to fig. 5 and fig. 6, the control switch circuit 150 is a first control switch K1. The first control switch K1 includes a first terminal, a second terminal, and a control terminal, and the first control switch K1 turns on or off between the first terminal and the second terminal according to a voltage of the control terminal.
The control terminal of the first control switch K1 is used as the control terminal Kin of the control switch circuit, the first terminal of the first control switch K1 is used as the first terminal a1 of the control switch circuit, and the second terminal of the first control switch K1 is used as the second terminal a2 of the control switch circuit.
Specifically, the control terminal of the first control switch K1 is electrically connected to the output terminal out2 of the control signal output circuit 142, and the voltage output by the output terminal out2 of the control signal output circuit 142 is the divided voltage of the second resistor R2 to the bias power supply 160, so that the voltage output by the output terminal out2 of the control signal output circuit 142 is at a high level, the first control switch K1 is turned on at the high level, and the voltage output by the output terminal Vout6 of the bias power supply 160 is transmitted to the output bias network 130 through the first control switch K1, so as to provide the output bias voltage for the depletion amplifier device 120. Therefore, the control switch circuit 150 can realize on-off control of the input bias voltage on the power supply of the output bias network 130, so that the output bias network can be ensured to provide the output bias network for the depletion type amplifier device after the input bias voltage is loaded to the input end of the depletion type amplifier device, and the phenomenon that the device is burnt due to the fact that the output bias current is too large due to too high input bias voltage is avoided.
On the basis of the above technical solutions, fig. 7 is a schematic structural diagram of another radio frequency amplifier provided in the embodiment of the present invention, and as shown in fig. 7, the radio frequency amplifier further includes an input matching network 170 and an output matching network 180. The input terminal of input matching network 180 is electrically connected to signal input terminal Vin and the output terminal of input matching network 170 is electrically connected to input terminal Vin2 of depletion amplifier device 120. Input matching network 170 may implement an impedance-matched connection between signal input Vin and depletion amplifier device 120.
The input of the output matching network 180 is electrically connected to the output terminal Vout2 of the depletion amplifier device 120, and the output of the output matching network 180 is electrically connected to the signal output terminal Vout. The output matching network 180 may implement an impedance-matched connection between the signal output terminal Vout and the depletion amplifier device 120.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A radio frequency amplifier is characterized by comprising an input bias network, a depletion mode amplifier device, an output bias network, a voltage conversion network, a control switch circuit and a bias power supply;
the output end of the input bias network is electrically connected with the input end of the depletion mode amplifier device;
the output end of the output bias network is electrically connected with the output end of the depletion mode amplifier device;
the voltage conversion network comprises an input end, an output end and a control signal output end, wherein the input end of the voltage conversion network is electrically connected with the output end of the bias power supply, and the output end of the voltage conversion network is electrically connected with the input end of the input bias network; the voltage conversion network is used for converting the power supply voltage output by the bias power supply output end into the input bias voltage of the input bias network;
the control switch circuit comprises a first end, a second end and a control end, the control end of the control switch circuit is electrically connected with the control signal output end of the voltage conversion network, the first end of the control switch circuit is electrically connected with the output end of the bias power supply, and the second end of the control switch circuit is electrically connected with the input end of the output bias network; the control switch circuit is used for transmitting the power supply voltage output by the bias power supply output end to the input end of the output bias network according to the control signal output by the control signal output end of the voltage conversion network;
after the output end of the voltage conversion network outputs the input bias voltage of the input bias network, the control signal output end of the voltage conversion network outputs a control signal to the control end of the control switch circuit to control the conduction of the control switch circuit;
the voltage conversion network comprises a voltage conversion chip and a control signal output circuit;
the voltage conversion chip comprises a first voltage input end, a voltage output end and a voltage control end, wherein the first voltage input end of the voltage conversion chip is used as the input end of the voltage conversion network, and the voltage output end of the voltage conversion chip is used as the output end of the voltage conversion network; the voltage conversion chip converts the power supply voltage output by the bias power supply output end into the input bias voltage of the input bias network;
a control signal input end of the control signal output circuit is electrically connected with a voltage control end of the voltage conversion chip, an input end of the control signal output circuit is electrically connected with an output end of the bias voltage, and an output end of the control signal output circuit is used as a control signal output end of the voltage conversion network; the control signal output circuit is used for outputting the control signal after outputting the signal at the voltage control end of the voltage conversion chip;
the control signal output circuit comprises a first transistor, a first resistor, a second resistor, a third resistor and a first capacitor;
a first end of the first resistor is used as a control signal input end of the control signal output circuit, and a second end of the first resistor is electrically connected with a control end of the first transistor;
the first end of the first capacitor is electrically connected with the first end of the first resistor, and the second end of the first capacitor is grounded;
the first end of the first transistor is electrically connected with the first end of the second resistor, and the second end of the first transistor is grounded;
the second end of the second resistor is electrically connected with the first end of the third resistor, the second end of the third resistor is electrically connected with the output end of the bias power supply, and the second end of the second resistor is used as the output end of the control signal output circuit.
2. The radio frequency amplifier of claim 1, wherein the voltage conversion chip further comprises a second voltage input and a switching transistor;
the control end of the switch transistor is electrically connected with the voltage output end of the voltage conversion chip, the first end of the switch transistor is electrically connected with the second voltage input end, and the second end of the switch transistor is used as the voltage control end of the voltage conversion chip.
3. The radio frequency amplifier of claim 2, wherein the switching transistor is a P-type transistor.
4. The radio frequency amplifier of claim 2, wherein the voltage conversion network further comprises a voltage divider sub-circuit;
the first input end of the voltage dividing sub-circuit is electrically connected with the output end of the bias power supply, the second input end of the voltage dividing sub-circuit is grounded, and the output end of the voltage dividing sub-circuit is electrically connected with the second voltage input end of the voltage conversion chip;
the voltage division sub-circuit is used for dividing the voltage output by the bias power supply and then inputting the divided voltage to the second voltage input end of the voltage conversion chip.
5. The RF amplifier of claim 4, wherein the voltage divider sub-circuit comprises a first voltage divider resistor and a second voltage divider resistor;
a first terminal of the first voltage-dividing resistor is used as a first input terminal of the voltage-dividing sub-circuit, a second terminal of the first voltage-dividing resistor is electrically connected to a first terminal of the second voltage-dividing resistor, the first terminal of the second voltage-dividing resistor is used as an output terminal of the voltage-dividing sub-circuit, and the second terminal of the second voltage-dividing resistor is used as a second input terminal of the voltage-dividing sub-circuit.
6. The radio frequency amplifier of claim 1, further comprising a signal input, a signal output, an input matching network, and an output matching network;
the input end of the input matching network is electrically connected with the signal input end, and the output end of the input matching network is electrically connected with the input end of the depletion-mode amplifier device;
the input end of the output matching network is electrically connected with the output end of the depletion type amplifier device, and the output end of the output matching network is electrically connected with the signal output end.
7. The radio frequency amplifier of claim 1, wherein the control switch circuit is a first control switch, the first control switch includes a first terminal, a second terminal and a control terminal, and the first control switch turns on or off the first terminal and the second terminal according to a voltage of the control terminal;
the control end of the first control switch is used as the control end of the control switch circuit, the first end of the first control switch is used as the first end of the control switch circuit, and the second end of the first control switch is used as the second end of the control switch circuit.
8. The radio frequency amplifier of claim 1, wherein the bias power supply is a dc power supply, and the bias power supply outputs a voltage greater than a voltage output by the output of the voltage switching network.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810790550.6A CN110739918B (en) | 2018-07-18 | 2018-07-18 | Radio frequency amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810790550.6A CN110739918B (en) | 2018-07-18 | 2018-07-18 | Radio frequency amplifier |
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| CN110739918A CN110739918A (en) | 2020-01-31 |
| CN110739918B true CN110739918B (en) | 2022-09-02 |
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| CN201810790550.6A Active CN110739918B (en) | 2018-07-18 | 2018-07-18 | Radio frequency amplifier |
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| CN113824407B (en) * | 2021-11-23 | 2022-02-15 | 广州慧智微电子股份有限公司 | Protection circuit and protection method of power amplifier |
| CN117335379A (en) * | 2023-09-19 | 2024-01-02 | 深圳市思远半导体有限公司 | Power supply selection circuit and power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160673A (en) * | 2016-06-30 | 2016-11-23 | 唯捷创芯(天津)电子技术股份有限公司 | Harmonic suppressing method and corresponding low-noise amplifier, communication terminal |
| CN106341090A (en) * | 2016-07-26 | 2017-01-18 | 苏州能讯高能半导体有限公司 | Power amplifying circuit |
| CN108123685A (en) * | 2016-11-29 | 2018-06-05 | 意法半导体有限公司 | Adjusting to RF amplifiers |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160673A (en) * | 2016-06-30 | 2016-11-23 | 唯捷创芯(天津)电子技术股份有限公司 | Harmonic suppressing method and corresponding low-noise amplifier, communication terminal |
| CN106341090A (en) * | 2016-07-26 | 2017-01-18 | 苏州能讯高能半导体有限公司 | Power amplifying circuit |
| CN108123685A (en) * | 2016-11-29 | 2018-06-05 | 意法半导体有限公司 | Adjusting to RF amplifiers |
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