WO2007136050A1 - 高周波スイッチ回路 - Google Patents
高周波スイッチ回路 Download PDFInfo
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- WO2007136050A1 WO2007136050A1 PCT/JP2007/060408 JP2007060408W WO2007136050A1 WO 2007136050 A1 WO2007136050 A1 WO 2007136050A1 JP 2007060408 W JP2007060408 W JP 2007060408W WO 2007136050 A1 WO2007136050 A1 WO 2007136050A1
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- bias
- frequency
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Classifications
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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
- H03K17/693—Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
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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
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/165—Modifications for eliminating interference voltages or currents in field-effect transistor switches by feedback from the output circuit to the control circuit
Definitions
- the present invention relates to a high frequency switch circuit for passing or blocking high frequency signals.
- FIG. 1 is an example of a high-frequency switch circuit using an FET, and is a circuit diagram showing a configuration of an SPDT (single pole double through) type high-frequency switch circuit.
- FIG. 1 shows the circuit disclosed in FIG. 1 of JP-A-8-139014.
- the high-frequency switch circuit shown in FIG. 1 includes a first switch unit 121 and a second switch unit 122 that pass or block high-frequency signals.
- the first switch unit 121 includes a plurality of FETs (four in FIG. 1) connected in series, and both ends thereof are connected to two high-frequency terminals 101 and 102.
- the gate terminal of each FET is connected to the control terminal 111 through a resistance element.
- the second switch unit 122 includes a plurality of FETs (four in FIG. 1) connected in series, and both ends thereof are connected to the two high-frequency terminals 101 and 103.
- the gate terminal of each FET is connected to the control terminal 112 through a resistance element.
- the high frequency terminal 101 is shared by the first switch unit 121 and the second switch unit 122.
- a high-level or low-level control signal is input to the control terminal 111 provided in the first switch unit 121 and the control terminal 112 provided in the second switch unit 122.
- the on / off of the first switch unit 121 and the second switch unit 122 is controlled.
- the control terminal 111 and the control terminal 112 have a high level and a low level. If the two control signals are complementarily input, the high frequency signal input from the high frequency terminal 101 is output from the high frequency terminal 102 or the high frequency terminal 103, or the high frequency signal input from the high frequency terminal 102 and the high frequency terminal 103 is output. Either one can be output from the high-frequency terminal 101.
- the drain source A technique for stabilizing the potential between the terminals is generally employed.
- the circuit shown in FIGS. 2 and 3 is a circuit that passes or blocks a high-frequency signal passing between the two high-frequency terminals Tl and ⁇ 2 by turning the FET on and off with the control signal Vc.
- 2 is the circuit disclosed in FIG. 1 of the above-mentioned Japanese Patent Application Laid-Open No. 2004-320439
- FIG. 3 is the circuit disclosed in FIG. 1 of Japanese Patent Application Laid-Open No. 11-239048.
- an object of the present invention is to provide a high-frequency switch circuit that can reduce distortion that occurs when a high-frequency signal passes.
- the present invention provides a high-frequency switch circuit that passes or blocks a high-frequency signal in accordance with a control signal, A field effect transistor that is turned on and off according to the control signal applied through a resistance element and that serves as a passage path for the high-frequency signal, and a potential difference is generated between the drain terminal and the source terminal of the field effect transistor.
- a switch unit having a plurality of bias circuits for applying different bias voltages that are lower than the voltage of the control signal, and generating a potential to generate the bias voltage from the control signal and supply the bias circuit to the bias circuit. Circuit,
- the high-frequency switch circuit configured as described above, by applying a bias voltage lower than the voltage of the control signal to the passage path of the high-frequency signal, the potential of the RF node decreases, and the field effect The voltage applied to the gate terminal of the transistor is increased.
- the on-state field effect transistor has a low on-resistance, and the drain terminal or source terminal force can suppress the on-resistance variation of the field-effect transistor with respect to the voltage variation of the input high-frequency signal.
- the field effect transistor in the off state since the input resistance is large, a noise voltage is applied as it is to the drain terminal and the source terminal, and a potential difference can be given between the drain and source terminals.
- FIG. 1 is a circuit diagram showing a configuration example of a high-frequency switch circuit according to related art.
- FIG. 1 is a circuit diagram showing another configuration example of a high-frequency switch circuit according to related art.
- FIG. 3 is a circuit diagram showing another configuration example of the high-frequency switch circuit of the related art.
- FIG. 4 is a block diagram showing the configuration of the high-frequency switch circuit of the first embodiment.
- FIG. 5 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 6 is a circuit diagram showing a specific example of the first switch portion and the second switch portion shown in FIG. 4.
- FIG. 6 is a circuit diagram showing a specific example of the first switch portion and the second switch portion shown in FIG. 4.
- FIG. 7 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG. FIG.
- FIG. 8 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG.
- FIG. 9 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 10 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 11 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 12 is a circuit diagram showing a specific example of the first switch unit and the second switch unit shown in FIG.
- FIG. 13 is a circuit diagram showing a specific example of the first switch portion and the second switch portion shown in FIG. 4.
- FIG. 14 is a circuit diagram showing a specific example of a noise circuit provided in the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 15 is a circuit diagram showing a specific example of a noise circuit provided in the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 16 is a circuit diagram showing a specific example of a noisy circuit included in the first switch unit and the second switch unit shown in FIG. 4.
- FIG. 17 is a circuit diagram showing a specific example of the potential generating circuit shown in FIG.
- FIG. 18 is a circuit diagram showing a specific example of the potential generating circuit shown in FIG.
- FIG. 19 is a circuit diagram showing a specific example of the potential generating circuit shown in FIG.
- FIG. 20 is a circuit diagram showing an example of the high-frequency switch circuit shown in FIG.
- FIG. 21 is a circuit diagram showing an example of the high-frequency switch circuit shown in FIG.
- FIG. 22 is a graph showing the effect of the high-frequency switch circuit of the first embodiment, and is a graph showing the relationship of the on-resistance of the FET to the input voltage.
- FIG. 23 is a diagram showing the effect of the high-frequency switch circuit of the first embodiment, and is a graph showing the relationship between the off-capacitance of the FET and the input voltage.
- FIG. 24 is a diagram showing the effect of the high-frequency switch circuit of the first embodiment, and is a graph showing how harmonic distortion is reduced.
- FIG. 25 is a block diagram showing a configuration of a high-frequency switch circuit according to a second embodiment.
- FIG. 26 is a circuit diagram showing an example of the high-frequency switch circuit shown in FIG.
- FIG. 4 is a block diagram showing the configuration of the high-frequency switch circuit of the first embodiment.
- FIG. 4 shows an example in which the configuration of the first embodiment is applied to an SPDT type high-frequency switch circuit.
- the high-frequency switch circuit of the first embodiment includes a first switch unit 21 and a second switch unit 22 that pass or block high-frequency signals, and a first switch unit 21 and a second switch unit. And a potential generation circuit 41 that supplies a predetermined bias voltage to the two switch sections 22.
- the first switch unit 21 is inserted between the first high-frequency terminal 1 and the second high-frequency terminal 2 through which high-frequency signals are input and output, and the second switch unit 22 is input and output from the high-frequency signals.
- the first high frequency terminal 1 and the third high frequency terminal 3 are inserted.
- the first high-frequency terminal 1 is shared by the first switch unit 21 and the second switch unit 22.
- the first switch unit 21 includes a control terminal 11 to which a control signal for passing or blocking a high-frequency signal is input, and a bias terminal for supplying a bias voltage to a circuit in the first switch unit 21 31 and 32.
- the second switch unit 22 includes a control terminal 12 to which a control signal for passing or blocking a high-frequency signal is input, and a noise switch for supplying a bias voltage to the circuit in the second switch unit 22. Terminals 33 and 34 are provided.
- the bias terminal 32 of the first switch unit 21 and the bias terminal 34 of the second switch unit 22 are connected to the output terminal 47 of the potential generation circuit 41, and the bias terminal 31 and the first terminal of the first switch unit 21 are connected.
- the bias terminal 33 of the second switch unit 22 is connected to the output terminal 48 of the potential generation circuit 41.
- the control terminal 11 of the first switch unit 21 is connected to the input terminal 43 of the potential generation circuit 41, and the control terminal 12 of the second switch unit 22 is the input terminal of the potential generation circuit 41. Connected with 42.
- the first switch unit 21 is turned on / off in accordance with a control signal input from the control terminal 11.
- the second switch unit 22 is turned on and off by the force S applied to the control signal input from the control terminal 12.
- the potential generation circuit 41 generates a bias voltage from control signals input to the control terminal 11 and the control terminal 12, and supplies the bias voltage to the first switch unit 21 and the second switch unit 22 respectively.
- the circuits shown in FIGS. 5 to 13 can be used.
- 5 to 13 are circuit diagrams showing specific examples of the first switch unit and the second switch unit shown in FIG. In the following description, the circuit configuration will be described using the first switch unit 21 as an example.
- the second switch unit 22 has the same configuration.
- the circuit shown in FIG. 5 includes a FET 51, a resistance element 91, a bias circuit 101, and a bias circuit 102 that serve as a high-frequency signal passage path.
- the drain ′ source terminal of the FET 51 is connected to the first high frequency terminal 1 and the second high frequency terminal 2, and the gate terminal of the FET 51 is connected to the control terminal 11 via the resistance element 91.
- the drain terminal (or source terminal) of FET 51 is connected to bias terminal 31 via noise circuit 101, and the source terminal (or drain terminal) of FET 51 is connected to bias terminal 32 via bias circuit 102. Yes.
- the bias circuit 101 shown in FIG. 5 is connected between the drain terminal (or source terminal) and the gate terminal of the FET 51, and the source terminal (or drain terminal) of the FET 51 is the bias circuit 102. This is connected to the bias terminal 32 via the.
- Other configurations are the same as those of the circuit shown in FIG.
- the bias circuit 102 is connected between the drain terminal (or source terminal) and the gate terminal of the FET 51, and the source terminal (or drain terminal) of the FET 51 is connected to the bias terminal 31 via the bias circuit 101. There may be.
- the unused bias terminal 31 may be opened. Using the circuit shown in Fig. 6 requires only a bias terminal force.
- the circuit shown in FIG. 7 includes four FETs 5 1 to 54 connected in series, four resistance elements 91 to 94, and four bias circuits 101 to 105, which are high-frequency signal passing paths. Constitution It is. Both ends of the FETs 51 to 54 connected in series are connected to the first high frequency terminal 1 and the second high frequency terminal 2.
- the gate terminals of the FETs 51 to 54 are connected to the control terminal 11 through resistance elements 91 to 94, and bias circuits 101 to 105 are connected to the connection points of the drain terminals and the source terminals of the FETs 51 to 54.
- the drain and source terminals of the FETs 51 to 54 are connected to the bias terminal 31 or the bias terminal 32 via the bias circuits 101 to 105.
- the bias circuits 101, 103, and 105 are connected to the bias terminal 31, and the noise circuits 102 and 104 are connected to the noise terminal 32.
- the bias circuit 101 shown in FIG. 7 is connected between the drain terminal (or source terminal) and the gate terminal of the FET 51, and the bias circuit 103 is connected to the source terminal (or drain terminal) of the FET 52.
- the bias circuit 105 is connected between the source terminal (or drain terminal) of the FET 54 and the gate terminal.
- the FET51 source terminal (or drain terminal) is connected to the bias terminal 31 via the bias circuit 102, and the FET53 source terminal (or drain terminal) is connected to the noisy terminal 31 via the bias circuit 104.
- the bias terminal 32 that is not used in the circuit shown in Fig. 8 should be open. If the circuit shown in Fig. 8 is used, the bias terminal can be used in the same way as the circuit shown in Fig. 6.
- the bias circuit 101 shown in FIG. 7 is connected between the drain terminal (or source terminal) and the gate terminal of the FET 51, and the bias circuit 105 is connected to the source terminal (or drain terminal) of the FET 54. And the gate terminal. Also, the source terminal (or drain terminal) of FET 51 is connected to bias terminal 31 via bias circuit 102, and the source terminal (or drain terminal) of FET 52 is connected to bias terminal 32 via noise circuit 103. The source terminal (or drain terminal) of the FET 53 is connected to the bias terminal 31 via the bias circuit 104. Other configurations are the same as those of the circuit shown in FIG. The bias terminal 32 that is not used in the circuit shown in Fig. 9 may be left open. If the circuit shown in Fig. 9 is used, the bias terminal can be used in the same way as the circuit shown in Fig. 6.
- the circuit shown in FIG. 10 includes four FETs 51 to 54 connected in series, four resistance elements 91 to 94, and two bias circuits 101 and 102, which are high-frequency signal passing paths. It is a configuration. Both ends of the FETs 51 to 54 connected in series are connected to the first high frequency terminal 1 and the second Connected to high frequency terminal 2. The gate terminals of the FETs 51 to 54 are connected to the control terminal 11 via the resistance elements 91 to 94, and the first high frequency terminal 1 and the second high frequency terminal located at both ends of the FETs 51 to 54 connected in series are Bias circuits 101 and 102 are connected. The first high frequency terminal is connected to the noise terminal 31 via the bias circuit 101, and the second high frequency terminal is connected to the bias terminal 32 via the bias circuit 102.
- the circuit shown in FIG. 11 is configured to be connected between the drain terminal (or source terminal) and the gate terminal of the bias circuit 102 force FET 54 shown in FIG. Other configurations are the same as those of the circuit shown in FIG. If the circuit shown in Fig. 11 is not used, the bias terminal 32 should be open. If the circuit shown in Fig. 11 is adopted, only one bias terminal is required, as in the circuits shown in Figs.
- the circuit shown in FIG. 12 has a configuration in which resistance elements are connected in parallel between the drain terminals and the source terminals of the four FETs 51 to 54 shown in FIG.
- a resistance element 95 is connected between the drain terminal and the source terminal of the FET 51
- a resistance element 96 is connected between the drain terminal and the source terminal of the FET 52
- a resistance element 97 is connected between the drain terminal and the source terminal of the FET 53.
- the resistor element 98 is connected between the drain terminal and the source terminal of the FET 54.
- Other configurations are the same as those of the circuit shown in FIG.
- the circuit shown in FIG. 13 has a configuration in which resistance elements are connected in parallel between the drain terminals and the source terminals of the four FETs 51 to 54 shown in FIG.
- a resistance element 95 is connected between the drain terminal and the source terminal of the FET 51
- a resistance element 96 is connected between the drain terminal and the source terminal of the FET 52
- a resistance element 97 is connected between the drain terminal and the source terminal of the FET 53.
- the resistor element 98 is connected between the drain terminal and the source terminal of the FET 54.
- Other configurations are the same as those of the circuit shown in FIG.
- FIGS. 5 to 13 show an example of a circuit in which the first switch unit 21 includes one FET 51 or an example of a circuit in which the first switch unit 21 includes four FETs 51 to 54.
- the switch unit 21 may be configured to include two or more FETs connected in series.
- the bias circuit may be inserted at any position as long as a potential difference can be applied between the drain terminal and the source terminal of each FET.
- FIGS. 5 to 13 the force of the first switch unit 21 including one or two bias terminals is shown.
- Each of the switch unit 21 and the second switch unit 22 may include three or more bias terminals.
- bias circuits are connected between the gate terminal and the drain terminal or the source terminal of the same FET.
- the bias circuit gives a potential difference between the drain and source terminals of each FET. If possible, they may be connected between the gate terminal and drain terminal or source terminal of different FETs.
- bias circuits 101 to 105 shown in FIGS. 5 to 13 for example, the circuits shown in FIGS. 14 to 16 can be used.
- FIGS. 14 to 16 are circuit diagrams showing specific examples of the bias circuit included in the first switch unit and the second switch unit shown in FIG.
- FIG. 14 shows an example using a resistance element R as a bias circuit
- FIG. 15 shows an example using an inductor element L as a noise circuit
- FIG. 16 shows an example using a resistance element R and an inductor element L connected in parallel as a noise circuit.
- the bias circuit is not limited to the circuits shown in FIGS. 14 to 16, and any circuit may be used as long as a DC voltage applied to one terminal is output from the other terminal.
- a circuit including a resistance element and an inductor element connected in series can be used.
- circuits shown in FIGS. 17 to 19 can be used for the potential generation circuit 41 shown in FIG.
- FIGS. 17 to 19 are circuit diagrams showing specific examples of the potential generating circuit shown in FIG.
- the circuit shown in FIG. 17 has a configuration including four diodes 113 to 116 and resistance elements 87 to 89.
- the anode of the diode 113 and the cathode of the diode 114 are connected to the input terminal 42, and the anode of the diode 115 and the cathode of the diode 116 are connected to the input terminal 43.
- resistance elements 87 to 89 connected in series are inserted.
- the connection point between the resistance element 87 and the resistance element 88 is connected to the output terminal 47, and the connection point between the resistance element 88 and the resistance element 89 is connected to the output terminal 48.
- the circuit shown in FIG. 18 includes a diode 117, a diode 118, and a resistance element 88 connected in series between the power sword of the diode 113 and the diode 115 shown in FIG. 17 and the anode of the diode 114 and the diode 116. It is the inserted configuration.
- connection point between the force sword of the diode 118 and the resistance element 88 is connected to the output terminal 47, and the connection point between the force sword of the diode 113 and the diode 115 and the anode of the diode 117 is connected to the output terminal 48.
- Other configurations are the same as those of the circuit shown in FIG.
- the circuit shown in FIG. 19 has a configuration including only four diodes 113 to 116.
- the anode of the diode 113 and the force sword of the diode 114 are connected to the input terminal 42, and the anode of the diode 115 and the force sword of the diode 116 are connected to the input terminal 43.
- the power swords of the diode 113 and the diode 115 are connected to the output terminal 48, and the anodes of the diode 114 and the diode 116 are connected to the output terminal 47.
- the force shown in the potential generation circuit 41 is provided with two output terminals 47 and 48.
- the bias terminals of the first switch unit 21 and the second switch unit 22 are one, (See Figures 6, 8, 11, and 13) only one of the output terminals needs to be used.
- the first switch unit 21 and the second switch unit 22 include three or more bias terminals, for example, the power swords of the diode 113 and the diode 115 and the diode 114 shown in FIGS.
- a resistance element or a diode may be further inserted in series between the anodes of the diode 116 and the connection point may be connected to the output terminal.
- the potential generation circuit 41 is not limited to the circuits shown in FIGS. 17 to 19 and can generate one or more voltages from the control signals input to the first switch unit 21 and the second switch unit 22. Any circuit may be used as long as it is a circuit.
- FIG. 20 Next, the operation of the high-frequency switch circuit according to the first embodiment will be described with reference to FIGS. 20 and 21.
- FIG. 20 uses the circuit shown in FIG. 7 for the first switch portion 21 and the second switch portion 22 shown in FIG. 4, and the first switch portion 21 and the second switch portion 22 are provided.
- the bias circuit 101 having a resistance element force is shared by the first switch unit 21 and the second switch unit 22.
- the high frequency shown in FIG. the bias terminal 31 of the first switch section 21 and the bias terminal 33 of the second switch section 22 are used in common, and the bias terminal 32 of the first switch section 21 and the second switch section are used. 22 bias terminals 34 are used in common.
- the high-frequency switch circuit shown in FIG. 20 includes the control terminal 11 of the first switch unit 21 and the control terminal 12 of the second switch unit 22 as in the related art high-frequency switch circuit shown in FIG.
- High level and low level binary control signals are input complementary.
- the operation will be described using an example in which a high-level control signal is input to the control terminal 11 of the first switch unit 21 and a low-level control signal is input to the control terminal 12 of the second switch unit.
- a high-level control signal is input to the control terminal 11 of the first switch unit 21 and a low-level control signal is input to the control terminal 12 of the second switch unit.
- the FETs 51 to 54 connected in series are turned on.
- the second switch unit 22 turns off the FETs 51 to 54 connected in series.
- the potential generation circuit 41 When a high level voltage is supplied to the input terminal 43 and a low level voltage is supplied to the input terminal 42, the potential generation circuit 41 generates a potential difference between the low level and the low level by the diodes 113 to 116. An approximately equal voltage is applied to the resistance elements 87 to 89 connected in series. At this time, voltages divided by the resistance elements 87 to 89 are output from the output terminal 47 and the output terminal 48, respectively.
- the output voltage of the output terminal 47 is supplied to the noise terminal 32 of the first switch unit 21 and the bias terminal 34 of the second switch unit 22, and the output voltage of the output terminal 48 is supplied to the first switch unit 21. This is supplied to the bias terminal 31 and the bias terminal 33 of the second switch section 22.
- the potential of the drain electrode and the source electrode of each FET in the ON state provided in the first switch unit 21 is substantially the same as the noise level applied to the control terminal 11.
- the high voltage applied to the control terminal 11 with respect to the bias terminals 31 and 32 is high.
- the potential of the RF node is lowered and the applied voltage of the gate terminal is increased.
- the on-resistance of the FET in the on state is reduced, and fluctuations in the on-resistance of the FET with respect to fluctuations in the input voltage input to the drain terminal or source terminal force are suppressed.
- FIG. 21 shows a bias provided in the first switch unit 21 and the second switch unit 22 using the circuit shown in FIG. 12 for the first switch unit 21 and the second switch unit 22 shown in FIG.
- the first switch unit 21 and the second switch unit 22 share a bias circuit 101 having a resistance element force.
- the bias terminal 31 of the first switch section 21 and the bias terminal 33 of the second switch section 22 are used in common, and the bias terminal 32 of the first switch section 21 is used.
- the bias terminal 34 of the second switch section 22 are commonly used.
- the high-frequency switch circuit shown in FIG. 21 includes the control terminal 11 of the first switch unit 21 and the control terminal 12 of the second switch unit 22 as in the related art high-frequency switch circuit shown in FIG.
- High level and low level binary control signals are input complementary.
- the operation will be described using an example in which a high-level control signal is input to the control terminal 11 of the first switch unit 21 and a low-level control signal is input to the control terminal 12 of the second switch unit.
- a high-level control signal is input to the control terminal 11 of the first switch unit 21 and a low-level control signal is input to the control terminal 12 of the second switch unit.
- the FETs 51 to 54 connected in series are turned on.
- the second switch unit 22 turns off the FETs 51 to 54 connected in series.
- the potential generation circuit 41 uses the diodes 113 to 116 to change the potential difference between the N level and the mouth level. An approximately equal voltage is applied to the resistance elements 87 to 89 connected in series. At this time, voltages divided by the resistance elements 87 to 89 are output from the output terminal 47 and the output terminal 48, respectively.
- the output voltage of the output terminal 47 is supplied to the noise terminal 32 of the first switch unit 21 and the bias terminal 34 of the second switch unit 22, and the output voltage of the output terminal 48 is supplied to the first switch unit 21. This is supplied to the bias terminal 31 and the bias terminal 33 of the second switch section 22.
- the potential of the drain electrode and the source electrode of each FET in the ON state provided in the first switch unit 21 is substantially the same as the noise level applied to the control terminal 11.
- the potential of the RF node decreases, and the gate terminal It acts to increase the applied voltage.
- the on-resistance of the FET in the on state is reduced, and fluctuations in the on-resistance of the FET with respect to fluctuations in the input voltage input to the drain or source terminal are suppressed.
- the voltages of the high-frequency terminal 1 and the high-frequency terminal 3 at both ends of the second switch section 22 are applied to the high-frequency terminal 1 as shown in the description of the RF node voltage in the first switch section 21 described above.
- the voltage of 32 is divided and applied by the bias circuit 101 and the noise circuit 102, and the voltage of the bias terminal 31 is applied to the high frequency terminal 3 via the bias circuit 105.
- a voltage obtained by dividing the voltage force applied to the high-frequency terminal 1 and the high-frequency terminal 3 by the resistance elements 95 to 98 is applied to the drain terminal and the source terminal of each FET in the off state included in the second switch unit 22. Applied. That is, a potential difference can be applied between the drain and source of the FET in the off state.
- the circuit shown in FIG. 12 used as the first switch unit 21 and the second switch unit 22 is connected in parallel between the drain terminal and the source terminal of the FET. Resistance elements 95 to 98 are provided.
- the circuit shown in FIG. 10 does not include the resistor elements 95 to 98, but the circuit shown in FIG. 10 is also applied between the high-frequency terminals connected to both ends of a plurality of FETs connected in series. Voltage is distributed by the resistance of the FET in the off state, creating a potential difference between the drain and source terminals of each FET in the off state. Therefore, the same effect as when the circuit shown in FIG. 12 is used can be obtained.
- each FET has a higher resistance than the FET OFF-state resistance, which depends on the applied voltage. Since a potential difference can be stably applied between the drain terminal and the source terminal, a greater distortion reduction effect can be obtained.
- the configuration in which a resistance element is connected between the drain terminal and the source terminal of the FET can also be applied to the misaligned switch portion shown in FIGS. The same applies to the second embodiment described later, as well as the first embodiment.
- the first switch unit 21 and the second switch unit 22 may be any one of the circuits shown in Figs. 5 to 13, and the first switch unit 21 and the second switch unit may be used. Any of the circuits shown in FIGS. 14 to 16 may be used as the bias circuit included in 22, and any of the circuits shown in FIGS. 17 to 19 may be used as the potential generation circuit 41.
- the first switch unit 21 and the second switch unit 22 are configured using one FET in the examples shown in FIGS. 5 and 6, and in the examples shown in FIGS. Forces showing an example configured using four FETs
- the number of FETs constituting these switch parts is not limited to the number shown in FIGS. Also, no matter how these circuits are combined, as in the circuits shown in Fig. 20 and Fig. 21, the drain of the FET in the on state decreases the potential of the source terminal, and the drain of the FET in the off state Can be given a potential difference.
- the on-resistance of the FET is negligible for each resistance element used in the bias circuit.
- Fig. 24 shows the results of simulation to determine the harmonic (twice the input frequency) level for the input power of the high-frequency switch circuit shown in Fig. 21 and the related-art high-frequency switch circuit shown in Fig. 1. Shown in As shown in FIG. 24, the high-frequency switch circuit of the first embodiment is improved in harmonics by about 5 dBc compared to the related-art high-frequency switch circuit.
- FIG. 25 is a block diagram showing the configuration of the high-frequency switch circuit of the second embodiment.
- FIG. 25 shows an example in which the configuration of the second embodiment is applied to a DPDT (double pole double through) type high-frequency switch circuit.
- DPDT double pole double through
- the high-frequency switch circuit of the second embodiment includes a first switch unit 21, a second switch unit 22, a third switch unit 23, and a fourth switch that pass or block high-frequency signals. And a potential generation circuit 41 that supplies a bias voltage to the first switch unit 21 to the fourth switch unit 24.
- the first switch unit 21 is inserted between the first high-frequency terminal 1 and the second high-frequency terminal 2 through which high-frequency signals are input and output, and the second switch unit 22 is input and output from the high-frequency signals.
- the second high frequency terminal 2 and the fourth high frequency terminal 3 are inserted.
- the third switch unit 23 is inserted between the third high-frequency terminal 3 and the fourth high-frequency terminal 4 through which high-frequency signals are input / output, and the fourth switch unit 24 is connected to the fourth high-frequency signal through the fourth high-frequency signal.
- the first switch portion 21 to the fourth switch portion 24 are connected in a ring shape by sharing their high-frequency terminals.
- the first switch unit 21 includes a control terminal 11 to which a control signal for passing or blocking a high-frequency signal is input, and a bias terminal for supplying a bias voltage to a circuit in the first switch unit 21 31 and 32.
- the second switch unit 22 includes a control terminal 12 to which a control signal for passing or blocking a high-frequency signal is input, and a second switch unit 22. Bias terminals 33 and 34 for supplying a bias voltage to the internal circuit are provided.
- the third switch unit 23 includes a control terminal 13 to which a control signal for controlling on / off is input, and bias terminals 35 and 36 for supplying a bias voltage to a circuit in the third switch unit 23.
- the fourth switch unit 24 includes a control terminal 14 to which a control signal for controlling on / off is input, and noisy terminals 37 and 38 for supplying a bias voltage to the circuits in the fourth switch unit 24. And have.
- the bias terminal 32 of the first switch unit 21, the bias terminal 34 of the second switch unit 22, the bias terminal 36 of the third switch unit 23, and the bias terminal 38 of the fourth switch unit 24 are potentials. Connected to the output terminal 47 of the generation circuit 41, the bias terminal 31 of the first switch section 21, the bias terminal 33 of the second switch section 22, the bias terminal 35 of the third switch section 23, and the fourth switch section 24 The bias terminal 37 is connected to the output terminal 48 of the potential generating circuit 41.
- control terminal 11 of the first switch unit 21 and the control terminal 13 of the third switch unit 23 are connected to the input terminal 42 of the potential generation circuit 41, and the control terminal 12 of the second switch unit 22 and The control terminal 14 of the fourth switch unit 24 is connected to the input terminal 43 of the potential generation circuit 41.
- the first switch unit 21 is turned on / off according to the control signal input from the control terminal 11, and the second switch unit 22 is turned on / off according to the control signal input from the control terminal 12.
- the third switch section 23 is turned on / off according to the control signal input from the control terminal 13
- the fourth switch section 24 is turned on according to the control signal input to the control terminal 14 force. Turn off.
- the potential generation circuit 41 also generates a predetermined bias voltage for the control signal force input to the control terminals 11 to 14, and supplies the bias voltage to the first switch unit 21 to the fourth switch unit 24, respectively.
- the circuits shown in FIGS. 5 to 13 can be used for the first switch portion 21 to the second switch portion 24 shown in FIG.
- the circuits shown in FIGS. 14 to 16 can be used as the bias circuits included in the first switch unit 21 to the fourth switch unit 24.
- the circuits shown in FIGS. 17 to 19 can be used as the potential generation circuit 41 shown in FIG.
- the 26 uses the circuit shown in FIG. 8 for the first switch portion 21 to the fourth switch portion 24 shown in FIG. 25, and the first switch portion 21 to the fourth switch portion 24 are 14 is an example in which the circuit shown in FIG. 14 is used as the bias circuit provided, and the circuit shown in FIG. However, the potential generation circuit 41 is an example including only the diodes 113 and 115.
- the first switch unit 21 to the fourth switch unit are used.
- the bias terminal provided with 24 is shared (bias terminal 31), and the bias voltage is supplied from the output terminal 48 of the potential generation circuit 41.
- a high-level control signal is input to the control terminal 11 of the first switch unit 21 and the control terminal 13 of the third switch unit 23, and the control terminal 12 and the fourth switch unit of the second switch unit 21
- the operation will be described by taking as an example a case where a low level control signal is input to the control terminal 14 of the switch unit 24.
- each FET connected in series is turned on.
- each FET connected in series is turned off.
- a high level control signal is input to the control terminal 11 of the first switch unit 21 and the control terminal 13 of the third switch unit 23, and the control terminal 12 and the fourth switch unit of the second switch unit 22 are input.
- a low level control signal is input to 24
- a high level voltage is supplied to the input terminal 42 of the potential generation circuit 41, and a low level voltage is supplied to the input terminal 43.
- the potential generation circuit 41 When a high-level voltage is supplied to the input terminal 42 and a low-level voltage is supplied to the input terminal 43, the potential generation circuit 41 has a high-level voltage from the diodes 113 and 115. A voltage that is lower than the forward voltage is generated and supplied from the output terminal 48 to the bias terminal 31 shared by each switch circuit.
- any of the circuits shown in FIGS. 5 to 13 may be used for the first switch portion 21 to the fourth switch portion 24.
- the bias circuit included in the fourth switch section 24 can use any of the circuits shown in Figs. 14 to 16.
- the potential generator 41 can use any of the circuits shown in Figs. 17 to 19. May be.
- the first switch unit 21 to the fourth switch unit 24 are configured by using one FET in the examples shown in FIGS. 5 and 6, and four FETs in the examples shown in FIGS.
- the force shown in Fig. 5 to Fig. 13 is not limited to the number of FETs composing these switch parts.
- each resistance element used in the bias circuit is sufficiently large so that the on-resistance of the FET can be ignored and power loss due to leakage of a high-frequency signal through these resistance elements does not increase. It is preferable to use a large value. However, it should be set to a value that is smaller than the FET off-resistance and negligible for the voltage drop caused by the current flowing through the resistance element.
- SPDT is described as an example of a high-frequency switch circuit
- DPDT is described as an example of a high-frequency switch circuit.
- the configuration shown in the first and second embodiments is also suitable for the switch circuit. Is available.
- the switch unit can also be configured using a P-channel FET. In that case, if the polarity of the control signal is reversed, the operation is the same as above.
Abstract
Description
Claims
Priority Applications (2)
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JP2008516693A JP5051129B2 (ja) | 2006-05-23 | 2007-05-22 | 高周波スイッチ回路 |
US12/301,488 US7915946B2 (en) | 2006-05-23 | 2007-05-22 | Switch circuit for high frequency signals wherein distortion of the signals are suppressed |
Applications Claiming Priority (4)
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JP2006-142575 | 2006-05-23 | ||
JP2006142575 | 2006-05-23 | ||
JP2007081695 | 2007-03-27 | ||
JP2007-081695 | 2007-03-27 |
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WO2007136050A1 true WO2007136050A1 (ja) | 2007-11-29 |
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PCT/JP2007/060408 WO2007136050A1 (ja) | 2006-05-23 | 2007-05-22 | 高周波スイッチ回路 |
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US (1) | US7915946B2 (ja) |
JP (1) | JP5051129B2 (ja) |
WO (1) | WO2007136050A1 (ja) |
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DE102008004861A1 (de) * | 2008-01-17 | 2009-07-23 | Infineon Technologies Ag | Schalteranordnung für einen Hochfrequenzsignalpfad |
JP2010016551A (ja) * | 2008-07-02 | 2010-01-21 | Mitsubishi Electric Corp | 移相回路 |
JP2011103537A (ja) * | 2009-11-10 | 2011-05-26 | Mitsubishi Electric Corp | 高周波半導体スイッチ |
US8476961B2 (en) * | 2010-04-16 | 2013-07-02 | Sige Semiconductor, Inc. | System and method of transistor switch biasing in a high power semiconductor switch |
JP2013143767A (ja) * | 2012-01-06 | 2013-07-22 | Richwave Technology Corp | 制御信号から補助電圧を取得する装置及び方法 |
US9543929B2 (en) | 2012-01-06 | 2017-01-10 | Richwave Technology Corp. | Apparatus and method for obtaining power voltage from control signals |
US10630287B2 (en) | 2018-08-10 | 2020-04-21 | Richwave Technology Corp. | Radio frequency device and voltage generating circuit thereof |
US11258445B2 (en) | 2019-10-17 | 2022-02-22 | Richwave Technology Corp. | Radio frequency apparatus and voltage generating device thereof |
US11290136B2 (en) | 2019-10-16 | 2022-03-29 | Richwave Technology Corp. | Radio frequency device and voltage generating device thereof |
US11870445B2 (en) | 2020-12-25 | 2024-01-09 | Richwave Technology Corp. | Radio frequency device and voltage generation and harmonic suppressor thereof |
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US8275336B2 (en) * | 2010-06-23 | 2012-09-25 | Richwave Technology Corp. | Apparatus and method for digitally controlling capacitance |
CN103201954A (zh) * | 2010-09-21 | 2013-07-10 | Dsp集团有限公司 | Cmos工艺中的rf开关实现方式 |
US20130252562A1 (en) * | 2010-09-21 | 2013-09-26 | Dsp Group, Ltd. | High power high isolation low current cmos rf switch |
JP5481461B2 (ja) * | 2011-11-01 | 2014-04-23 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | スイッチ |
US9240770B2 (en) * | 2013-03-15 | 2016-01-19 | Rf Micro Devices, Inc. | Harmonic cancellation circuit for an RF switch branch |
KR20150035219A (ko) * | 2013-09-27 | 2015-04-06 | 삼성전기주식회사 | 고주파 스위치 |
CN105049013A (zh) * | 2015-07-14 | 2015-11-11 | 海宁海微电子科技有限公司 | 单刀六掷射频收发开关电路 |
US10715133B1 (en) | 2019-05-30 | 2020-07-14 | Qorvo Us, Inc. | Radio frequency switch |
JP2021078106A (ja) * | 2019-10-31 | 2021-05-20 | パナソニックIpマネジメント株式会社 | スイッチ回路および撮像装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102008004861A1 (de) * | 2008-01-17 | 2009-07-23 | Infineon Technologies Ag | Schalteranordnung für einen Hochfrequenzsignalpfad |
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JP2011103537A (ja) * | 2009-11-10 | 2011-05-26 | Mitsubishi Electric Corp | 高周波半導体スイッチ |
US8476961B2 (en) * | 2010-04-16 | 2013-07-02 | Sige Semiconductor, Inc. | System and method of transistor switch biasing in a high power semiconductor switch |
JP2013143767A (ja) * | 2012-01-06 | 2013-07-22 | Richwave Technology Corp | 制御信号から補助電圧を取得する装置及び方法 |
US9543929B2 (en) | 2012-01-06 | 2017-01-10 | Richwave Technology Corp. | Apparatus and method for obtaining power voltage from control signals |
US10630287B2 (en) | 2018-08-10 | 2020-04-21 | Richwave Technology Corp. | Radio frequency device and voltage generating circuit thereof |
US11290136B2 (en) | 2019-10-16 | 2022-03-29 | Richwave Technology Corp. | Radio frequency device and voltage generating device thereof |
US11258445B2 (en) | 2019-10-17 | 2022-02-22 | Richwave Technology Corp. | Radio frequency apparatus and voltage generating device thereof |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2007136050A1 (ja) | 2009-10-01 |
US7915946B2 (en) | 2011-03-29 |
US20090206910A1 (en) | 2009-08-20 |
JP5051129B2 (ja) | 2012-10-17 |
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