WO2005006541A1 - 高周波電力増幅回路 - Google Patents
高周波電力増幅回路 Download PDFInfo
- Publication number
- WO2005006541A1 WO2005006541A1 PCT/JP2004/005596 JP2004005596W WO2005006541A1 WO 2005006541 A1 WO2005006541 A1 WO 2005006541A1 JP 2004005596 W JP2004005596 W JP 2004005596W WO 2005006541 A1 WO2005006541 A1 WO 2005006541A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transistor
- terminal
- resistor
- base
- frequency power
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 abstract description 23
- 230000001629 suppression Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 16
- 230000007423 decrease Effects 0.000 description 16
- 238000003199 nucleic acid amplification method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 11
- 241000282376 Panthera tigris Species 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/34—DC amplifiers in which all stages are DC-coupled
- H03F3/343—DC amplifiers in which all stages are DC-coupled with semiconductor devices only
- H03F3/3432—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with bipolar transistors
- H03F3/3435—DC amplifiers in which all stages are DC-coupled with semiconductor devices only with bipolar transistors using Darlington amplifiers
-
- 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
- H03F3/191—Tuned amplifiers
Definitions
- the present invention relates to a high-frequency power amplifier circuit in which transistors are connected in a plurality of stages, and in particular, a transistor in a final stage of the high-frequency power amplifier circuit and a transistor in a preceding stage.
- the present invention relates to a circuit for applying a bias voltage to a transistor.
- GaAs-MESFETs Metal Semiconductor Field Effect Transistors
- HEMTs high-speed electron mobility transistors
- HBTs heterojunction bibola transistors
- a heterojunction bipolar transistor must be able to operate from a single power supply and be turned on by a bias voltage applied to the base terminal.
- High-frequency amplifier circuits using heterojunction bipolar transistors are often used because they can switch the Z-off operation, and because the current density of the element itself is high and the element can be formed smaller than FETs. And so on.
- FIG. 6 shows an example in which two transistors are connected as a high-frequency amplifier circuit using such a bipolar transistor (hereinafter simply referred to as a “transistor”).
- FIG. 6 is an equivalent circuit diagram of a conventional high frequency power amplifier circuit.
- the conventional high frequency amplifier circuit an input integer if circuit 2 0 1 to the input terminal 1 0 1, tiger Njisuta T r have the transistor pace terminal T B 1 via the capacitor ⁇ E is connected Capacitor on T r 1 collector terminal T C 1 And a transistor T r 2 to the base terminal T B2 are connected via a C 2.
- the collector terminal of the transistor T r 2 T C2 is connected to the output terminal 1 02 via a capacitor C 3, the output matching circuit 2 02.
- Emitta terminal T E have T E2 of the transistor T r have T r 2 is grounded.
- This high-frequency amplifier circuit has a first base bias voltage application terminal 103 for applying a base bias current to the transistor Tr, a first power supply voltage application terminal 104 for supplying a collector current, and Is provided. Also, a second base bias voltage applying terminal 105 for applying a base bias current to the transistor Tr 2 and a second power supply voltage applying terminal 106 for supplying a collector current are provided. .
- the first base bias voltage applying terminal 1 0 3 and the transistor resistor is connected between the base terminal T B 1 of T r, the second base bias voltage applying terminal 1 0 5 and the transistor T r 2 resistor R 2 is connected between the base terminal T B2.
- Inductor L 2 are connected between the second power supply voltage application terminal 1 0 6 and the transistor T r 2 of the collector terminal T C2, between the ground and the second power supply voltage application terminal 1 06 Is capacitor C. 2 is connected.
- the high-frequency signal input to the input terminal 101 is input to the transistor Tri via the input matching circuit 201 and the capacitor, and is power-amplified.
- Power ⁇ high frequency signal via the capacitor C 2 is input to the transistor T r 2, further power amplification.
- high-frequency signal power-amplified by transistor T r have T r 2 of the second stage is outputted from the capacitor C 3, via the output matching circuit 20 second output terminal 1 02.
- the above-described high-frequency power amplifier circuit is used for a portable information terminal such as a mobile phone, and has a structure in which an output terminal 102 of the high-frequency power amplifier circuit is connected to an antenna.
- the impedance of the antenna is set to 50 ⁇ , but the impedance may change due to proximity to an external conductor such as a metal pillar.
- the impedance of the antenna that is changed will be a load impedance viewed output terminal from the high-frequency power amplifier is changed, the transistor T r 1; operating condition of T r 2 is changed.
- the transistor T 1-2 operating conditions of the final stage of the output terminal 1 0 2 side greatly varying I spoon, the base current of the transistor T r 2 largely changes accordingly.
- the load impedance magnitude 3 times different collector currents by is some cases flowing through the transistor T r 2.
- the possibility of the transistor breaking or burning increases.
- increasing the resistance value of the resistor vessel R 2 to be connected to the base terminal T B 2 of the transistor T r 2 variation in the base current Contact Yopi collector current can be suppressed, but the steady state by the resistor R 2 In this case, a sufficient base current cannot be supplied. For this reason, the saturation output current of the transistor in the state before the load change is reduced, and the desired power amplification characteristic cannot be obtained. Become.
- An object of the present invention is to provide a high-frequency power amplifier circuit that suppresses a change in a collector current flowing in a final-stage transistor due to a change in impedance of an element connected to an output terminal and that can obtain a desired power amplification characteristic.
- the present invention provides a high-frequency power amplifier circuit in which transistors are connected in a plurality of stages to supply a bias current to a base terminal of a last-stage transistor and a base terminal of a preceding-stage transistor of the last-stage transistor. At least one bias voltage application terminal; a first resistor connected between the bias voltage application terminal and a base terminal of the last transistor; and a first resistor of the last transistor in the first resistor. It is characterized by including a second resistor connected between the base terminal side and the base terminal of the preceding transistor.
- the present invention is characterized in that a third resistor is connected between a connection point between the first resistor and the second resistor and a base terminal of the last transistor.
- the present invention is characterized in that at least one of the second and third resistors is replaced with an inductor.
- the operating conditions of the last transistor change depending on the value, and the base current increases.
- the voltage drop at the first resistor connected between the bias voltage application terminal and the base terminal at the final stage increases.
- the voltage applied to the second resistor connected between this resistor and the previous transistor in the final stage decreases, causing the base of the previous transistor to drop.
- Current decreases. This reduces the collector current of the preceding transistor.
- the high-frequency power input to the final stage base terminal decreases.
- the operating conditions of the transistor change, and an increase in the collector current is suppressed.
- the change in the collector current of the last transistor is suppressed regardless of the change in the impedance of the connected load.
- a high-frequency power amplifier circuit in which a plurality of transistors are connected in a plurality of stages with a stable power amplification characteristic by suppressing a change in the collector current of the last-stage transistor in accordance with a change in impedance of a connected load. Can be formed.
- FIG. 1 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the first embodiment.
- FIG. 2 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the second embodiment.
- FIG. 3 is an equivalent circuit diagram of the high-frequency power spreading circuit according to the third embodiment.
- FIG. 4 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the fourth embodiment.
- FIG. 5 is a diagram illustrating a relationship between a load impedance and a collector current in the high-frequency power amplifier circuit according to the fourth embodiment and a conventional high-frequency power amplifier circuit.
- FIG. 6 is an equivalent circuit diagram of a conventional high-frequency power amplifier circuit.
- a high-frequency power amplifier circuit according to a first embodiment of the present invention will be described with reference to FIG.
- FIG. 1 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the present embodiment.
- the high frequency power amplifier circuit, an input matching circuit 2 0 1 to the input terminal 1 0 1, and Tran register T r of the base terminal T B 1 is connected via a capacitor, the transistor T r and a transistor T r 2 to the base terminal T B 2 are connected via the capacitor C 2 to the collector terminal T C 1.
- the collector terminal T C 2 of the transistor Tr 2 is the capacitor C 3 and the output matching circuit 2 It is connected to the output terminal 102 via the 02.
- the transistor T r 1; Emitta terminal T E1 T E2 of T r 2 is grounded.
- the transistor Tr and the transistor Tr 2 correspond to the preceding transistor and the last transistor, respectively, of the present invention.
- This high-frequency amplifier circuit has a base bias voltage application terminal 110 for applying a base bias voltage to the transistor Tr or Tr 2 , and a first power supply voltage application terminal 1 for supplying a collector current to each of them. 04 and a second power supply voltage application terminal 106.
- This base bias voltage application terminal 110 corresponds to the bias voltage application terminal of the present invention.
- resistor R " a resistor R is provided between the base terminal T B 1 of the connection point and preparative transistor T r between 13 that have resistor 2 is connected.
- the resistor R " is the first resistor of the present invention
- resistors R 12 corresponds to a second resistor of the present invention.
- transistor T r 2 is connected to Indakuta L 2, between the ground and the second power supply voltage application terminal 1 06 Capacitor C02 is connected.
- These inductors Data L 2 and a capacitor C. 2 prevents the high frequency signal from being transmitted to the second power supply voltage application terminal 106 side.
- the high-frequency signal input to the input terminal 101 is input to the transistor Tr via the input matching circuit 201 and the capacitor.
- This power-amplified high-frequency signal is output to the terminal T C1 and is input to the base terminal T B2 of the transistor Tr 2 via the capacitor C 2.
- the transistor Tr 2 is connected to the base bias voltage application terminal 1 1 0 through a resistor 1 R 13 operated by a drive current applied from, performs power amplification of the high frequency signal inputted to the base terminal T B2, and outputs to the collector terminal T C2.
- the transistor T r physician The high-frequency signal power-amplified by the two-stage amplifier circuit based on Tr 2 is output from the output terminal 102 via the capacitor C 3 and the output matching circuit 202.
- the output of the transistor T r is decreased, a high-frequency signal input to the transistor T r 2 Total one scan terminal T B2 is reduced.
- the transistor Tr When the high-frequency signal input to 2 decreases, the operating condition of transistor Tr 2 changes, and the increase in collector current due to the increase in base current is suppressed.
- the change in the collector current according to the change in the impedance on the output terminal side is suppressed, the destruction and burning of the last-stage transistor due to the impedance change of the load can be suppressed.
- the high-frequency power amplifier circuit can have a predetermined power amplification characteristic regardless of the load impedance.
- the resistance values of the resistors Ru, R 12 , and R 13 may be appropriately set as described above so that an increase in the collector current of the transistor Tr 2 can be complemented by a decrease in the output of the transistor Tri.
- FIG. 2 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the present embodiment.
- an emitter terminal TE4 is connected to the base bias voltage application terminal 110 side of the resistor Rn in the high-frequency power amplifier circuit according to the first embodiment, and the base terminal T B4 baseband Iasu voltage application terminal 1 1 0 through the resistor R 14 to is provided with a transistor T r 4 to be connected.
- Supply voltage applying terminal 1 0 7 is connected to the collector terminal T C4 of the transistor T r 4.
- Other configurations are the same as those of the high-frequency power amplifier circuit according to the first embodiment.
- the transistor T the base current of r have T r 2 by supplying the collector current of transistor T r 4, T r have T base bias current of r 2, smaller transistor T r than the base current It can be controlled by the base current of 4 .
- FIG. 3 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the present embodiment.
- the collector terminal T C5 is connected to the resistor R "in the high-frequency power amplification circuit according to the first embodiment
- the emitter terminal T E5 is connected to the resistor R 13
- the base second Besubaiasu voltage application terminal 1 1 2 is provided with a transistor T r 5 which is connected via a resistor R 14 to the terminal T B5.
- a transistor Tr 6 to which the base bias voltage application terminal 111 is connected is provided.
- Other configurations are the same as those of the high frequency power amplifier circuit according to the first embodiment.
- the collector current of the transistor T1s is decreased, the high-frequency signal is reduced to be inputted to the transistor T r 2, changes in the operating conditions of the transistor T r 2 is is further suppressed, bets transistor T r 2 The effect of suppressing the increase in the collector current is further improved.
- the high frequency The operation of the transistor for high-frequency power amplification can be controlled with a small base current of the transistor different from that for wave power amplification.
- resistor R 1 2 between the emitter terminal T E e of the base terminal T B 1 and Tran register T r 6 of the transistor T r, the resistor R 1 2 inductor May be replaced by Or, yo les skip this resistor R 1 2,.
- the connecting resistor R 1 3 between the emitter terminal T E 5 of the base terminal T B 2 and Tran register T r 5 of the transistor T r 2, the resistor R 1 3 It may be replaced with an inductor. Alternatively, the resistor 3 may be omitted.
- FIG. 4 is an equivalent circuit diagram of the high-frequency power amplifier circuit according to the present embodiment.
- the high-frequency power amplifier circuit shown in FIG. 4 is different from the high-frequency power amplifier circuit shown in the third embodiment in that the first power supply voltage application terminal 104 is removed and the connection point between the inductor and the capacitor C Q1 is connected to a resistor. connected to the power supply voltage application terminal 1 0 7 side of the vessel, is obtained by connecting a resistor R 1 6 between the connection point and the power supply voltage application terminal 1 0 7.
- Other configurations are the same as those of the high-frequency power amplifier circuit shown in the third embodiment.
- FIG. 5 compares the conventional example the relation between the collector current of the VS WR (Voltage Standing Wave Ratio) force S 1 0 and comprising a load impedance and the phase of the transistor T r 2 (the last-stage transistor) Show.
- VS WR Voltage Standing Wave Ratio
- the operation control of the high-frequency power amplification transistor can be performed with a small base current of the transistor different from that for the high-frequency power amplification.
- the resistor R 1 2 inductor May be replaced by Alternatively, the resistor R 12 may be omitted.
- the high-frequency power amplifier circuit including two-stage transistors is described.
- the above-described configuration may be applied to a high-frequency power amplifier circuit including three or more transistors.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-196544 | 2003-07-14 | ||
JP2003196544 | 2003-07-14 |
Publications (1)
Publication Number | Publication Date |
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WO2005006541A1 true WO2005006541A1 (ja) | 2005-01-20 |
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ID=34055813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/005596 WO2005006541A1 (ja) | 2003-07-14 | 2004-04-20 | 高周波電力増幅回路 |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999033172A1 (fr) * | 1997-12-22 | 1999-07-01 | Hitachi, Ltd. | Systeme d'amplification de puissance et terminal de communication radio mobile |
JP2001257540A (ja) * | 2000-03-13 | 2001-09-21 | Fujitsu Quantum Devices Ltd | 高周波電力増幅器および通信装置 |
-
2004
- 2004-04-20 WO PCT/JP2004/005596 patent/WO2005006541A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999033172A1 (fr) * | 1997-12-22 | 1999-07-01 | Hitachi, Ltd. | Systeme d'amplification de puissance et terminal de communication radio mobile |
JP2001257540A (ja) * | 2000-03-13 | 2001-09-21 | Fujitsu Quantum Devices Ltd | 高周波電力増幅器および通信装置 |
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