CN106231496B - Control circuit and audio amplifier based on difference output - Google Patents
Control circuit and audio amplifier based on difference output Download PDFInfo
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- CN106231496B CN106231496B CN201610815702.4A CN201610815702A CN106231496B CN 106231496 B CN106231496 B CN 106231496B CN 201610815702 A CN201610815702 A CN 201610815702A CN 106231496 B CN106231496 B CN 106231496B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The invention belongs to the technical field of sound box control circuits, and particularly relates to a control circuit based on differential output and a sound box. In the embodiment of the invention, the control circuit based on differential output comprises a Bluetooth chip and a power amplifier, the control circuit based on differential output also comprises a first operational amplifier and a second operational amplifier which are sequentially connected in series between the Bluetooth chip and the power amplifier, an audio differential signal output by the Bluetooth chip is subjected to dual output control by the first operational amplifier and the second operational amplifier, and a sound box adopting the control circuit based on differential output can effectively control very small and low system noise without changing the performance of differential output.
Description
Technical Field
The invention belongs to the technical field of sound box control circuits, and particularly relates to a control circuit based on differential output and a sound box.
Background
A speaker refers to a device that can convert an audio signal into sound. The popular way is that a power amplifier is arranged in a main box body or a bass box body of the sound box, and the sound is emitted back by the sound box after the audio signal is amplified, so that the sound is increased.
The current loudspeaker box product design has differential audio loudspeaker box output and can provide power amplification. But when very low noise occurs, effective and thorough control cannot be achieved.
Disclosure of Invention
The embodiment of the invention aims to provide a control circuit based on differential output and a sound box, and aims to solve the problem that the existing differential audio sound box cannot solve low noise.
The embodiment of the invention is realized in such a way that the control circuit based on differential output comprises a Bluetooth chip and a power amplifier, the control circuit based on differential output further comprises a first operational amplifier and a second operational amplifier which are sequentially connected in series between the Bluetooth chip and the power amplifier, and an audio differential signal output by the Bluetooth chip is subjected to dual output control by the first operational amplifier and the second operational amplifier.
Another objective of the embodiments of the present invention is to provide a sound box, including a control circuit based on differential output, where the control circuit based on differential output includes a bluetooth chip and a power amplifier, the control circuit based on differential output further includes a first operational amplifier and a second operational amplifier sequentially connected in series between the bluetooth chip and the power amplifier, and an audio differential signal output by the bluetooth chip is controlled by dual output of the first operational amplifier and the second operational amplifier.
In the embodiment of the invention, the control circuit based on differential output comprises a Bluetooth chip and a power amplifier, the control circuit based on differential output also comprises a first operational amplifier and a second operational amplifier which are sequentially connected in series between the Bluetooth chip and the power amplifier, an audio differential signal output by the Bluetooth chip is subjected to dual output control by the first operational amplifier and the second operational amplifier, and a sound box adopting the control circuit based on differential output can effectively control very small and low system noise without changing the performance of differential output.
Drawings
Fig. 1 is a block diagram of a differential output based control circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a structure of a differential output-based control circuit according to an embodiment of the present invention, and for convenience of description, only a part related to the embodiment of the present invention is shown.
The utility model provides a control circuit based on difference output, includes bluetooth chip 1 and power amplifier 2, control circuit based on difference output still is including establishing ties in proper order 3 and second fortune are put to first fortune between bluetooth chip 1 and the power amplifier 2, 4 dual output control is put through first fortune to the audio frequency differential signal of bluetooth chip 1 output 3 and second fortune.
As an embodiment of the present invention, the first operational amplifier 3 includes:
the circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier chip U1;
a first end of the capacitor C1 is connected to the differential signal output terminal SPK _ L _ P of the bluetooth chip 1, the second end of the capacitor C1 is connected with the first negative input end 1 IN-of the operational amplifier chip U1 through a resistor R1, the first positive input terminal 1IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through the resistor R2 and the capacitor C4 IN parallel, the capacitor C3 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U1, the first output terminal 1OUT of the operational amplifier chip U1 is connected to the second operational amplifier 4 through the resistor R6, the capacitor C7 and the resistor R5 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U1, the power supply terminal VDD of the operational amplifier chip U1 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U1 is grounded, the capacitor C9 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U1;
the first end of the capacitor C2 is connected to the differential signal output terminal SPK _ L _ N of the bluetooth chip 1, the second end of the capacitor C2 is connected to the second negative input terminal 2IN "of the operational amplifier chip U1 through a resistor R3, the second positive input terminal 2IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through a resistor R4 and a capacitor C6 which are connected IN parallel, the capacitor C5 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U1, the second output terminal 2OUT of the operational amplifier chip U1 is connected to the second operational amplifier 4 through the resistor R8, and the capacitor C8 and the resistor R7 are connected IN parallel between the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U1.
As an embodiment of the present invention, the second operational amplifier 4 includes:
the circuit comprises a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier chip U2;
a first terminal of the capacitor C10 is connected to the differential signal output terminal SPK _ L _ P of the first operational amplifier 3, the second end of the capacitor C10 is connected with the first negative input end 1 IN-of the operational amplifier chip U2 through a resistor R9, the first positive input terminal 1IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through the resistor R10 and the capacitor C13 IN parallel, the capacitor C12 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U2, the first output end 1OUT of the operational amplifier chip U2 is connected with the power amplifier 2 through the resistor R15, the capacitor C16 and the resistor R13 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U2, the power supply terminal VDD of the operational amplifier chip U2 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U2 is grounded, the capacitor C18 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U2;
the first end of the capacitor C11 is connected to the differential signal output terminal SPK _ L _ N of the first operational amplifier 3, the second end of the capacitor C11 is connected to the second negative input terminal 2IN "of the operational amplifier chip U2 through a resistor R11, the second positive input terminal 2IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through a resistor R12 and a capacitor C15 which are connected IN parallel, the capacitor C14 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U2, the second output terminal 2OUT of the operational amplifier chip U2 is connected to the power amplifier through the resistor R16, and the capacitor C17 and the resistor R14 are connected IN parallel between the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U2.
The embodiment of the invention also provides a sound box, which comprises a control circuit based on differential output, wherein the control circuit comprises a Bluetooth chip 1 and a power amplifier 2, the control circuit based on differential output further comprises a first operational amplifier 3 and a second operational amplifier 4 which are sequentially connected in series between the Bluetooth chip 1 and the power amplifier 2, and an audio differential signal output by the Bluetooth chip 1 is subjected to double output control through the first operational amplifier 3 and the second operational amplifier 4.
As an embodiment of the present invention, the first operational amplifier 3 includes:
the circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier chip U1;
a first end of the capacitor C1 is connected to the differential signal output terminal SPK _ L _ P of the bluetooth chip 1, the second end of the capacitor C1 is connected with the first negative input end 1 IN-of the operational amplifier chip U1 through a resistor R1, the first positive input terminal 1IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through the resistor R2 and the capacitor C4 IN parallel, the capacitor C3 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U1, the first output terminal 1OUT of the operational amplifier chip U1 is connected to the second operational amplifier 4 through the resistor R6, the capacitor C7 and the resistor R5 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U1, the power supply terminal VDD of the operational amplifier chip U1 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U1 is grounded, the capacitor C9 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U1;
the first end of the capacitor C2 is connected to the differential signal output terminal SPK _ L _ N of the bluetooth chip 1, the second end of the capacitor C2 is connected to the second negative input terminal 2IN "of the operational amplifier chip U1 through a resistor R3, the second positive input terminal 2IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through a resistor R4 and a capacitor C6 which are connected IN parallel, the capacitor C5 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U1, the second output terminal 2OUT of the operational amplifier chip U1 is connected to the second operational amplifier 4 through the resistor R8, and the capacitor C8 and the resistor R7 are connected IN parallel between the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U1.
As an embodiment of the present invention, the second operational amplifier 4 includes:
the circuit comprises a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier chip U2;
a first terminal of the capacitor C10 is connected to the differential signal output terminal SPK _ L _ P of the first operational amplifier 3, the second end of the capacitor C10 is connected with the first negative input end 1 IN-of the operational amplifier chip U2 through a resistor R9, the first positive input terminal 1IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through the resistor R10 and the capacitor C13 IN parallel, the capacitor C12 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U2, the first output end 1OUT of the operational amplifier chip U2 is connected with the power amplifier 2 through the resistor R15, the capacitor C16 and the resistor R13 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U2, the power supply terminal VDD of the operational amplifier chip U2 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U2 is grounded, the capacitor C18 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U2;
the first end of the capacitor C11 is connected to the differential signal output terminal SPK _ L _ N of the first operational amplifier 3, the second end of the capacitor C11 is connected to the second negative input terminal 2IN "of the operational amplifier chip U2 through a resistor R11, the second positive input terminal 2IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through a resistor R12 and a capacitor C15 which are connected IN parallel, the capacitor C14 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U2, the second output terminal 2OUT of the operational amplifier chip U2 is connected to the power amplifier through the resistor R16, and the capacitor C17 and the resistor R14 are connected IN parallel between the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U2.
The working principle is as follows:
1. the audio frequency differential signal is output SPK _ L _ P and SPK _ L _ N from the Bluetooth chip, passes through the operational amplifier chip U1, and is output to the power amplifier after the operational amplifier chip U2, and finally is output to the loudspeaker.
2. The output of the whole audio differential signal needs to be compared with the reference voltage DC _ PA/2 for output, and meanwhile, capacitors C7, C8, C16 and C17 are added to feedback circuits of the operational amplifier chip U1 and the operational amplifier chip U2 for filtering and controlling the audio frequency output range.
In the embodiment of the invention, the control circuit based on differential output comprises a Bluetooth chip and a power amplifier, the control circuit based on differential output also comprises a first operational amplifier and a second operational amplifier which are sequentially connected in series between the Bluetooth chip and the power amplifier, an audio differential signal output by the Bluetooth chip is subjected to dual output control by the first operational amplifier and the second operational amplifier, and a sound box adopting the control circuit based on differential output can effectively control very small and low system noise without changing the performance of differential output.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A control circuit based on differential output comprises a Bluetooth chip and a power amplifier and is characterized by further comprising a first operational amplifier and a second operational amplifier which are sequentially connected in series between the Bluetooth chip and the power amplifier, wherein an audio differential signal output by the Bluetooth chip is subjected to dual output control through the first operational amplifier and the second operational amplifier;
the first operational amplifier comprises:
the circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier chip U1;
a first end of the capacitor C1 is connected to the differential signal output terminal SPK _ L _ P of the bluetooth chip, the second end of the capacitor C1 is connected with the first negative input end 1 IN-of the operational amplifier chip U1 through a resistor R1, the first positive input terminal 1IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through the resistor R2 and the capacitor C4 IN parallel, the capacitor C3 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U1, the first output terminal 1OUT of the operational amplifier chip U1 is connected to the second operational amplifier through the resistor R6, the capacitor C7 and the resistor R5 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U1, the power supply terminal VDD of the operational amplifier chip U1 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U1 is grounded, the capacitor C9 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U1;
the first end of the capacitor C2 is connected to the differential signal output terminal SPK _ L _ N of the bluetooth chip, the second end of the capacitor C2 is connected to the second negative input terminal 2IN "of the operational amplifier chip U1 through a resistor R3, the second positive input terminal 2IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through a resistor R4 and a capacitor C6 which are connected IN parallel, the capacitor C5 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U1, the second output terminal 2OUT of the operational amplifier chip U1 is connected to the second operational amplifier through the resistor R8, and the capacitor C8 and the resistor R7 are connected IN parallel to the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U1.
2. The differential output-based control circuit of claim 1, wherein the second op-amp comprises:
the circuit comprises a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier chip U2;
a first terminal of the capacitor C10 is connected to the differential signal output terminal SPK _ L _ P of the first operational amplifier, the second end of the capacitor C10 is connected with the first negative input end 1 IN-of the operational amplifier chip U2 through a resistor R9, the first positive input terminal 1IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through the resistor R10 and the capacitor C13 IN parallel, the capacitor C12 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U2, the first output end 1OUT of the operational amplifier chip U2 is connected with the power amplifier through the resistor R15, the capacitor C16 and the resistor R13 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U2, the power supply terminal VDD of the operational amplifier chip U2 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U2 is grounded, the capacitor C18 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U2;
a first end of the capacitor C11 is connected to the differential signal output terminal SPK _ L _ N of the first operational amplifier, a second end of the capacitor C11 is connected to the second negative input terminal 2IN "of the operational amplifier chip U2 through a resistor R11, a second positive input terminal 2IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through a resistor R12 and a capacitor C15 which are connected IN parallel, the capacitor C14 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U2, the second output terminal 2OUT of the operational amplifier chip U2 is connected to the power amplifier through the resistor R16, and the capacitor C17 and the resistor R14 are connected IN parallel between the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U2;
the differential signal output ends SPK _ L _ P and SPK _ L _ N of the first operational amplifier are respectively formed by an output end of the resistor R6 and an output end of the resistor R8.
3. A sound box is characterized by comprising a control circuit based on differential output, wherein the control circuit based on differential output comprises a Bluetooth chip and a power amplifier, the control circuit based on differential output further comprises a first operational amplifier and a second operational amplifier which are sequentially connected in series between the Bluetooth chip and the power amplifier, and an audio differential signal output by the Bluetooth chip is subjected to dual output control through the first operational amplifier and the second operational amplifier;
the first operational amplifier comprises:
the circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier chip U1;
a first end of the capacitor C1 is connected to the differential signal output terminal SPK _ L _ P of the bluetooth chip, the second end of the capacitor C1 is connected with the first negative input end 1 IN-of the operational amplifier chip U1 through a resistor R1, the first positive input terminal 1IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through the resistor R2 and the capacitor C4 IN parallel, the capacitor C3 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U1, the first output terminal 1OUT of the operational amplifier chip U1 is connected to the second operational amplifier through the resistor R6, the capacitor C7 and the resistor R5 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U1, the power supply terminal VDD of the operational amplifier chip U1 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U1 is grounded, the capacitor C9 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U1;
the first end of the capacitor C2 is connected to the differential signal output terminal SPK _ L _ N of the bluetooth chip, the second end of the capacitor C2 is connected to the second negative input terminal 2IN "of the operational amplifier chip U1 through a resistor R3, the second positive input terminal 2IN + of the operational amplifier chip U1 is connected to the reference voltage DC _ PA/2 through a resistor R4 and a capacitor C6 which are connected IN parallel, the capacitor C5 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U1, the second output terminal 2OUT of the operational amplifier chip U1 is connected to the second operational amplifier through the resistor R8, and the capacitor C8 and the resistor R7 are connected IN parallel to the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U1.
4. The acoustic enclosure of claim 3, wherein the second operational amplifier comprises:
the circuit comprises a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and an operational amplifier chip U2;
a first terminal of the capacitor C10 is connected to the differential signal output terminal SPK _ L _ P of the first operational amplifier, the second end of the capacitor C10 is connected with the first negative input end 1 IN-of the operational amplifier chip U2 through a resistor R9, the first positive input terminal 1IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through the resistor R10 and the capacitor C13 IN parallel, the capacitor C12 is connected between the first negative input terminal 1 IN-and the first positive input terminal 1IN + of the operational amplifier chip U2, the first output end 1OUT of the operational amplifier chip U2 is connected with the power amplifier through the resistor R15, the capacitor C16 and the resistor R13 are connected IN parallel between the first negative input end 1 IN-and the first output end 1OUT of the operational amplifier chip U2, the power supply terminal VDD of the operational amplifier chip U2 is connected with the reference voltage DC _ PA, the ground terminal GND of the operational amplifier chip U2 is grounded, the capacitor C18 is connected between a power supply end VDD and a ground end GND of the operational amplifier chip U2;
a first end of the capacitor C11 is connected to the differential signal output terminal SPK _ L _ N of the first operational amplifier, a second end of the capacitor C11 is connected to the second negative input terminal 2IN "of the operational amplifier chip U2 through a resistor R11, a second positive input terminal 2IN + of the operational amplifier chip U2 is connected to the reference voltage DC _ PA/2 through a resistor R12 and a capacitor C15 which are connected IN parallel, the capacitor C14 is connected between the second negative input terminal 2 IN" and the second positive input terminal 2IN + of the operational amplifier chip U2, the second output terminal 2OUT of the operational amplifier chip U2 is connected to the power amplifier through the resistor R16, and the capacitor C17 and the resistor R14 are connected IN parallel between the second negative input terminal 2IN "and the second output terminal 2OUT of the operational amplifier chip U2;
the differential signal output ends SPK _ L _ P and SPK _ L _ N of the first operational amplifier are respectively formed by an output end of the resistor R6 and an output end of the resistor R8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815702.4A CN106231496B (en) | 2016-09-08 | 2016-09-08 | Control circuit and audio amplifier based on difference output |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815702.4A CN106231496B (en) | 2016-09-08 | 2016-09-08 | Control circuit and audio amplifier based on difference output |
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| CN106231496A CN106231496A (en) | 2016-12-14 |
| CN106231496B true CN106231496B (en) | 2021-03-19 |
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| CN101350601A (en) * | 2008-09-04 | 2009-01-21 | 华为技术有限公司 | Power amplifier and signal processing method thereof |
| CN102340564A (en) * | 2010-07-20 | 2012-02-01 | 上海闻泰电子科技有限公司 | Circuit board for low-noise mobile phone and method for reducing noise of mobile phone system |
| CN202818236U (en) * | 2011-12-31 | 2013-03-20 | 福建星网视易信息系统有限公司 | High tone-quality audio output circuit |
| US9344045B2 (en) * | 2013-05-29 | 2016-05-17 | Intel Mobile Communications GmbH | Amplifier and method of amplifying a differential signal |
| CN204031079U (en) * | 2014-08-07 | 2014-12-17 | 深圳供电局有限公司 | Signal amplification and power amplification circuit |
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