WO1999000895A1 - Dispositif amplificateur de puissance - Google Patents
Dispositif amplificateur de puissance Download PDFInfo
- Publication number
- WO1999000895A1 WO1999000895A1 PCT/JP1998/002880 JP9802880W WO9900895A1 WO 1999000895 A1 WO1999000895 A1 WO 1999000895A1 JP 9802880 W JP9802880 W JP 9802880W WO 9900895 A1 WO9900895 A1 WO 9900895A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- amplifier
- output
- power amplifier
- power
- Prior art date
Links
- 230000003321 amplification Effects 0.000 claims abstract description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 16
- 238000001514 detection method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
-
- 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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
- H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
- H03G7/08—Volume compression or expansion in amplifiers having semiconductor devices incorporating negative feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45138—Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers
Definitions
- the present invention relates to a power amplifying device used for various audio equipment.
- the signal input from the input terminal 1 passes through the voltage control amplifier 2 and is amplified by the power amplifier 9 composed of the negative feedback circuit 4, the voltage amplifier 3 and the power amplifier 5 to drive the speed 6.
- the output of the voltage control amplifier 2 is That is, the input voltage of the power amplifier 9 is detected, converted into a pulse by the voltage comparator 7, integrated by the integration circuit 8 and converted into a DC signal, and the amplification of the voltage control amplifier 2 is reduced to reduce the output of the voltage control amplifier 2.
- Limiter means were configured to suppress waveform distortion.
- a power amplifying apparatus for solving the above-mentioned problem detects a voltage from a contact point between a voltage amplifier and a power amplifier, and controls the voltage control amplifier using the voltage. It constitutes the means. With this configuration, it is possible to prevent signal clipping due to the magnitude of the input signal and fluctuations in the power supply voltage.
- FIG. 1 is a block diagram showing a power amplifying device in Embodiment 1 of the present invention
- FIG. 2 is a circuit diagram showing a voltage comparator constituting a limiter circuit of the device
- FIG. FIG. 4 is a waveform diagram of the input voltage and the output voltage of the voltage comparator
- FIG. 4 is a characteristic diagram showing the distortion of the power supply voltage versus the output voltage of the device and a comparative example
- FIG. FIG. 6 is a circuit diagram showing a voltage comparator of the device
- FIG. 7 is a block diagram showing a power amplifying device in Embodiment 3 of the present invention
- FIG. FIG. 9 is a block diagram showing a power amplifying device in Embodiment 4 of the present invention
- FIG. 9 is a block diagram showing a power amplifying device in Embodiment 5 of the present invention
- FIG. 10 is another example of the device.
- FIG. 11 is a block diagram showing a conventional power amplifier. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing a configuration of a limiter circuit of the power amplifying apparatus according to the first embodiment of the present invention.
- input terminal 1 The applied signal is input to the voltage-controlled amplifier 2, where the amplitude is limited.
- the output of the voltage control amplifier 2 is connected to the first-stage voltage amplifier 3 of the power amplifier 9.
- a voltage fed back from the output of the power amplifier 5 through the negative feedback circuit 4 is also applied.
- the output of this voltage amplifier 3 is connected to a power amplifier 5 whose output drives a speaker 6. Since the connection point between the voltage amplifier 3 and the power amplifier 5 is in the negative feedback loop of the negative feedback circuit 4, when the output waveform is clipped, a sine wave like the voltage waveform in Fig. 3 is obtained.
- the waveform has a bump near the maximum amplitude. This is due to the negative feedback control that attempts to correct the output signal because the output voltage clip signal is fed back to the voltage amplifier 3 through the negative feedback circuit 4, and this voltage is connected to the voltage comparator 7. Then, you can get the clipped information.
- the voltage comparator 7 for comparing the voltage at the connection point between the voltage amplifier 3 and the power amplifier 5 with the reference voltage.
- the limiter is configured to convert the voltage to the voltage control amplifier 2.
- a so-called wind comparator as shown in FIG. 2 is used as the voltage comparator 7, a so-called wind comparator as shown in FIG. 2 is used.
- the input terminal 10 is connected to the inverting input terminal and the non-inverting input terminal of the comparators 15 and 16, and the non-inverting input terminal and the comparator of the comparator 15 are connected.
- the reference voltage is applied to the inverting input terminal of comparator 16 by resistors 11, 12, and 13 and the common output terminal to which the power supply voltage is applied by resistor 14 of comparators 15, 16 is connected.
- To output terminals 17 It is of a connected configuration.
- the output pulse waveform of this window comparison generates an abnormal voltage like a bump at the connection point of the voltage amplifier 3 and the power amplifier 5 as shown in Fig. 3 (a).
- the output stage is set so that a pulse is generated as shown in Fig. 3 (b) when the output stage is clipped.
- the amplification of the amplifier 2 can be reduced, and the output clip of the power
- FIG. 4 is a characteristic diagram showing the power supply voltage vs. the distortion factor of the embodiment 1 and the comparative example.
- the power amplifying device in the case where the limiter is not used as in the comparative example is the power supply voltage of the power amplifier. As it drops, the output will clip and the distortion will worsen.
- the limiter circuit according to the first embodiment is used, the voltage control amplifier 2 is controlled to follow the fluctuation of the power supply voltage and the input voltage is reduced, so that the distortion rate is almost constant even if the power supply voltage fluctuates. The waveform is not clipped.
- FIG. 5 is a block diagram showing a configuration of a limiter circuit of the power amplifying apparatus according to the second embodiment of the present invention.
- This limiter means converts the output signal of the voltage controlled amplifier 2 into a voltage.
- the two voltage comparators are connected to the inputs of the comparators 4 and 4, and the phase of the output signal of the voltage amplifier 3 is inverted through the inverting amplifier 19 of the amplification degree 1 and then connected to the voltage comparator 18.
- the sum of the outputs of 44 and 18 is converted to DC by the integration circuit 8 to control the voltage control amplifier 2.
- the voltage comparators 44 and 18 use what is called a window comparator as shown in Fig. 6.
- the window comparator 4 is the same as that used in the first embodiment, and the other window comparator has an input Terminal 22 is connected to the inverting input terminal and the non-inverting input terminal of comparators 26 and 27, and resistors 23 and 27 are connected to the non-inverting input terminal of comparator 26 and the inverting input terminal of comparator 27.
- a reference voltage is applied by 24 and 25, and the output terminals of comparators 26 and 27 are commonly connected. Since the outputs of these window comparators are all open collectors, they are connected to the direct, and are connected to the power supply terminal via a pull-up resistor 20.
- the outputs of the two sets of wind comparators are converted to DC voltage by the integration circuit 8 and the amplification of the voltage control amplifier 2 is changed.
- window comparators 44 and 18 generate a pulse when their respective voltages are exceeded, but the window comparator 44 is mainly effective for excessive input,
- the wind comparator 18 is effective for waveform clipping of the power amplifier as described in the first embodiment.
- the peak value of the waveform is 180 even when all the comparators operate. It is possible to prevent the output voltage from being superimposed due to the difference in phase, thereby preventing the control voltage from being inaccurate.
- FIG. 7 is a block diagram showing a configuration of a limiter circuit of the power amplifying apparatus according to the third embodiment of the present invention.
- the limiter means includes an output signal of the voltage controlled amplifier 2 and a voltage amplifier. 3 is connected to the adder 28 to sum the signals, the output signal of the adder 28 is connected to the voltage comparator 7, and the output of the voltage comparator 7 is Then, the voltage is converted into a DC voltage to control the amplification degree of the voltage control amplifier 2.
- Example 4 Example 4
- FIG. 8 is a block diagram showing a power amplifier 9 according to the present invention.
- the power amplifier 9 is composed of a voltage amplifier 3, a power amplifier 5, and a negative feedback circuit 4, and sets the respective amplification factors to determine the total amplification factor.
- the amplification of the voltage amplifier 3 is set to be equal to or less than the amplification of the power amplifier 5 ′. With this setting, it is possible to prevent the voltage amplifier 3 from clipping before the power amplifier 5 clips the waveform, thereby preventing the detection signal from becoming inaccurate.
- FIG. 9 and FIG. 10 are block diagrams showing the configuration, which will be described below.
- FIG. 9 shows a configuration in which the power amplifier 5 has a single output (an output amplitude can be obtained between the power amplifier 5 and the ground), and an operational amplifier 36 and resistors 31 to 35 are provided before the power amplifier 5. It consists of a voltage amplification stage configured as described above. The amplification of the voltage amplification stage is determined by the operational amplifier 36 and the resistors 31, 32, 33, and 35, and the resistor 34 is a negative feedback resistor, which determines the total amplification.
- Fig. 10 shows a block diagram when the power amplifier 5 has a BTL configuration (two amplifiers output positive and negative signals). Voltage amplifier stage is differentially amplified by operational amplifier 4 3 and resistors 37 to 42 If configured as a limiter, the limiter detection output terminal 30 can be similarly provided.
- the limiter circuit provided in the power amplifying device of the present invention does not cause the output signal of the power amplifier to be clipped according to the magnitude of the input voltage of the amplifier, the fluctuation of the power supply voltage, and the like. It is an excellent one that can always supply a normal music signal without generating abnormal noise from the speakers.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98929718A EP0921635B1 (en) | 1997-06-27 | 1998-06-26 | Power amplifier device |
US09/230,790 US6163212A (en) | 1997-06-27 | 1998-06-26 | Power amplifier system |
DE69838609T DE69838609T2 (de) | 1997-06-27 | 1998-06-26 | Leistungsverstärker |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/171424 | 1997-06-27 | ||
JP9171424A JPH1117478A (ja) | 1997-06-27 | 1997-06-27 | 電力増幅装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999000895A1 true WO1999000895A1 (fr) | 1999-01-07 |
Family
ID=15922884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/002880 WO1999000895A1 (fr) | 1997-06-27 | 1998-06-26 | Dispositif amplificateur de puissance |
Country Status (5)
Country | Link |
---|---|
US (1) | US6163212A (ja) |
EP (1) | EP0921635B1 (ja) |
JP (1) | JPH1117478A (ja) |
DE (1) | DE69838609T2 (ja) |
WO (1) | WO1999000895A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6329876B1 (en) | 1999-01-04 | 2001-12-11 | Tripath Technology, Inc. | Noise reduction scheme for operational amplifiers |
GB2369278B (en) * | 2000-12-27 | 2003-02-19 | Eugenie Sergeyevich Aleshin | Method of sound channel upgrading |
US7413846B2 (en) * | 2004-11-15 | 2008-08-19 | Microchips, Inc. | Fabrication methods and structures for micro-reservoir devices |
JP2006340121A (ja) * | 2005-06-03 | 2006-12-14 | Onkyo Corp | スピーカー用増幅器およびこれを用いたスピーカーシステム |
JP4728737B2 (ja) * | 2005-08-17 | 2011-07-20 | Necエンジニアリング株式会社 | 振幅制御回路 |
US8036402B2 (en) | 2005-12-15 | 2011-10-11 | Harman International Industries, Incorporated | Distortion compensation |
JP5128269B2 (ja) * | 2007-12-27 | 2013-01-23 | アルパイン株式会社 | 音響装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56103510A (en) * | 1980-01-23 | 1981-08-18 | Hitachi Ltd | Mobile power amplifier for automobile |
JPS58177022A (ja) * | 1982-04-09 | 1983-10-17 | Sony Corp | 自動レベル制御回路 |
JPS6045518U (ja) * | 1983-09-05 | 1985-03-30 | ソニー株式会社 | 自動レベル制御回路 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5168148A (en) * | 1990-12-28 | 1992-12-01 | Symbol Technologies, Inc. | Automatic gain control circuit |
US5432473A (en) * | 1993-07-14 | 1995-07-11 | Nokia Mobile Phones, Limited | Dual mode amplifier with bias control |
US5589796A (en) * | 1994-11-01 | 1996-12-31 | Motorola, Inc | Method and apparatus for increasing amplifier efficiency |
US5838807A (en) * | 1995-10-19 | 1998-11-17 | Mitel Semiconductor, Inc. | Trimmable variable compression amplifier for hearing aid |
-
1997
- 1997-06-27 JP JP9171424A patent/JPH1117478A/ja active Pending
-
1998
- 1998-06-26 WO PCT/JP1998/002880 patent/WO1999000895A1/ja active IP Right Grant
- 1998-06-26 US US09/230,790 patent/US6163212A/en not_active Expired - Lifetime
- 1998-06-26 DE DE69838609T patent/DE69838609T2/de not_active Expired - Lifetime
- 1998-06-26 EP EP98929718A patent/EP0921635B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56103510A (en) * | 1980-01-23 | 1981-08-18 | Hitachi Ltd | Mobile power amplifier for automobile |
JPS58177022A (ja) * | 1982-04-09 | 1983-10-17 | Sony Corp | 自動レベル制御回路 |
JPS6045518U (ja) * | 1983-09-05 | 1985-03-30 | ソニー株式会社 | 自動レベル制御回路 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0921635A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0921635B1 (en) | 2007-10-24 |
JPH1117478A (ja) | 1999-01-22 |
DE69838609D1 (de) | 2007-12-06 |
EP0921635A1 (en) | 1999-06-09 |
US6163212A (en) | 2000-12-19 |
EP0921635A4 (en) | 2004-07-14 |
DE69838609T2 (de) | 2008-02-07 |
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