CN108810753B - Self-adaptive Boost circuit device suitable for digital audio chip - Google Patents
Self-adaptive Boost circuit device suitable for digital audio chip Download PDFInfo
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Abstract
The invention provides a self-adaptive Boost circuit device suitable for a digital audio chip, which comprises: a digital audio interface; an audio decoding module; the signal processing module comprises a data segmentation module and an envelope taking and filter module; a delay matching module; a Vbat real-time following module; a phase-locked loop module; a voltage step counter; the clock control module and the Boost circuit module. The invention provides a simple and effective alignment mode, so that the Boost voltage can timely follow the power change of an audio signal, and the power efficiency is improved on the premise of ensuring the tone quality; meanwhile, the switching process of the voltage is controlled, Boost output ripples are reduced, and EMI is improved.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a self-adaptive Boost circuit device suitable for a digital audio chip.
Background
The popularization of handheld devices places strict requirements on the power consumption of chips. The efficiency of the audio power amplifier chip needs to be improved as much as possible to meet the application requirements.
The audio signal has a wide dynamic range of power, typically between 40dB and 120 dB. Such as the common 16bit CD audio, with a dynamic range of 96 dB. Therefore, a Boost circuit for providing power for the audio power amplifier does not need to work constantly at the highest voltage. However, the output requirements of the Boost circuit can be adjusted in real time to be adaptive to the current audio power.
According to the above, the Boost circuit as its power supply does not need to operate at a constant high voltage for a long time based on the characteristics of the audio signal. An audio chip for a handheld device can improve power efficiency on the premise of ensuring sound quality if the voltage of the audio chip can be automatically adjusted through a Boost circuit.
Existing Boost power supplies for audio circuits either provide a constant voltage or an adaptive voltage without controlling the switching process of the voltage. The following problems typically arise in applications:
1) under a single boost voltage working mode, the efficiency still needs to be improved;
2) in a Boost self-adaptive mode, an audio signal and a Boost voltage matched with the audio signal are difficult to align effectively, so that the final tone quality and efficiency are influenced;
3) in Boost self-adaptation mode, direct switching of voltage can cause EMI (electromagnetic interference) and affect sound quality.
For example, the Chinese patent application for invention relates to an audio self-adaptive BOOST circuit, a BOOST chip and audio equipment,
suitable for use in the field of integrated circuits, including: the input voltage detection unit is used for detecting and judging the voltage gear of the power supply and correspondingly generating a power supply voltage gear signal; the audio signal detection unit detects the voltage amplitude of the audio input signal and generates an audio amplitude level signal according to the voltage amplitude of the audio signal; the voltage control unit selects a corresponding voltage gear according to the power supply voltage gear signal and selects a boost control signal of a corresponding voltage grade in the selected voltage gear according to the audio amplitude grade signal; and a boosting unit for boosting according to the boosting control signal. The invention automatically detects the power supply electric quantity, correspondingly selects the boosting range, enlarges the boosting range, reduces the loss, further adjusts the boosting output according to the audio frequency, keeps the matching of the boosting gain and the audio frequency gain and reduces the loss to the lowest. However, this technique still has the following problems:
1. not suitable for digital interface audio;
2. boost voltage and audio data cannot be accurately aligned;
3. the Boost voltage change process cannot be precisely controlled;
4. there is less concern about EMI issues.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide an adaptive Boost circuit device suitable for a digital audio chip, which provides a simple and effective alignment mode, so that the Boost voltage can timely follow the power change of an audio signal, and the power efficiency can be improved on the premise of ensuring the tone quality; meanwhile, the switching process of the voltage is controlled, Boost output ripples are reduced, and EMI is improved.
The invention is realized by the following technical scheme.
An adaptive Boost circuit arrangement for a digital audio chip, comprising:
digital audio interface: the digital audio interface provides audio output interfaces with various standards and outputs audio data streams to the audio decoding module;
an audio decoding module: the audio decoding module decodes the audio data stream and outputs the audio data stream to the signal processing module;
the signal processing module: the signal processing module comprises a data segmentation module and an envelope taking and filter module, and the decoded audio data stream forms continuous segmented data through the data segmentation module, then is subjected to envelope taking and filtering processing through the envelope taking and filter module and then is output to the delay matching module;
a delay matching module: the delay matching module takes the minimum time slot as a unit, and regulates the early lagging allowance of the Boost voltage output by the Boost circuit module according to the voltage required by the audio data stream after signal processing to form a voltage switching indication signal and output the voltage switching indication signal to the voltage step counter;
vbat real-time following module: the Vbat real-time following module detects the system power voltage in real time and outputs the detected system power voltage to a voltage step counter;
a phase-locked loop module: the phase-locked loop module provides a reference clock for the Boost circuit module and outputs the reference clock to the clock control module;
a voltage step counter: the voltage step counter forms a voltage setting instruction according to the voltage switching indication signal and the detected system power supply voltage and outputs the voltage setting instruction to the Boost circuit module to control the Boost circuit module to output a voltage switching behavior;
a clock control module: the clock control module selects a clock with optimized pulse generation frequency and duty ratio according to different Boost voltages in proportion according to a single-step voltage clock demand control signal and a reference clock, and outputs a controlled clock instruction to the Boost circuit module;
boost circuit module: and the Boost circuit module outputs a Boost voltage according to a voltage setting instruction and a controlled clock instruction.
Preferably, the data segmentation module specifies a minimum time slot for data processing, and segments the audio data stream according to the minimum time slot; the envelope taking part in the envelope taking and filter module obtains the envelope of each section of data so as to obtain the maximum amplitude of each section of data, and the filter part in the envelope taking and filter module performs filter shaping on the obtained continuous sequence of the maximum amplitudes and outputs the filtered sequence.
Preferably, the voltage setting instruction includes: setting starting and stopping voltage, setting stepping voltage and setting single-step voltage clock requirement; wherein:
the starting and stopping voltage setting comprises setting of a starting voltage target value and a stopping voltage target value, and is used for defining a starting point and a stopping point of each voltage switching process;
the step voltage setting comprises setting a step value for defining the change value of a single step in the voltage switching process;
the single-step voltage clock requirement setting comprises setting of two parameters of clock frequency and duty ratio, and is used for defining a clock corresponding to the single-step voltage.
Preferably, the principle that the delay matching module specifies the advance hysteresis margin of the Boost voltage is as follows:
when the Nth section of data is processed by the signal processing module and indicates that high voltage is needed, setting the advance allowance of the Boost voltage output by the Boost circuit module at the moment as M minimum time slots;
when the (N + 1) th stage data does not need high voltage, the Boost voltage output by the Boost circuit module is removed under the condition that continuous M +1 stage data does not need high voltage, and the hysteresis margin at the moment is set as M +1 minimum time slots.
Preferably, the value of M is set to be 1-2.
Preferably, the minimum time slot is set to be 0.1-5 ms.
Compared with the prior art, the invention has the following beneficial effects:
1. the self-adaptive Boost circuit device suitable for the digital audio chip provided by the invention can be used for realizing the self-adaptation of the Boost multilevel voltage.
2. The self-adaptive Boost circuit device suitable for the digital audio chip controls the Boost output to be self-adaptive to the real-time power of an audio signal.
3. By adopting the self-adaptive Boost circuit device suitable for the digital audio chip, when the audio power is increased, the Boost jumps ahead and is stabilized at a higher voltage; when the power is reduced, the Boost is delayed and jumped, so that the audio power amplifier can be effectively prevented from topping;
4. the self-adaptive Boost circuit device suitable for the digital audio chip provided by the invention can control the switching process of the Boost voltage, reduce the output ripple of the Boost and improve the EMI.
5. The invention is suitable for the digital audio chip of the integrated Boost circuit, utilizes the existing circuit module, realizes simplicity and reliability, and is suitable for the submicron or deep submicron BCD manufacturing process.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of an adaptive Boost voltage switching implemented in the present invention;
fig. 2 is a schematic structural diagram of an adaptive Boost circuit device suitable for a digital audio chip according to the present invention;
FIG. 3 is a schematic diagram of a rising process of a Boost output voltage switching process;
FIG. 4 is a schematic diagram illustrating a decreasing process of the Boost output voltage switching process;
FIG. 5 is a diagram illustrating a minimum timeslot and a Boost voltage advance hysteresis margin in accordance with an embodiment of the present invention;
fig. 6 is a schematic diagram of the voltage step counter controlling the Boost voltage switching behavior according to the clock distribution and Vbat following according to an embodiment of the present invention.
Detailed Description
The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Examples
The embodiment provides an adaptive Boost circuit device suitable for a digital audio chip, comprising:
digital audio interface: the digital audio interface provides audio output interfaces with various standards and outputs audio data streams to the audio decoding module;
an audio decoding module: the audio decoding module decodes the audio data stream and outputs the audio data stream to the signal processing module;
the signal processing module: the signal processing module comprises a data segmentation module and an envelope taking and filter module, and the decoded audio data stream forms continuous segmented data through the data segmentation module, then is subjected to envelope taking and filtering processing through the envelope taking and filter module and then is output to the delay matching module;
a delay matching module: the delay matching module takes the minimum time slot as a unit, and regulates the early lagging allowance of the Boost voltage output by the Boost circuit module according to the voltage required by the audio data stream after signal processing to form a voltage switching indication signal and output the voltage switching indication signal to the voltage step counter;
vbat real-time following module: the Vbat real-time following module detects the system power voltage in real time and outputs the detected system power voltage to a voltage step counter;
a phase-locked loop module: the phase-locked loop module provides a reference clock for the Boost circuit module and outputs the reference clock to the clock control module;
a voltage step counter: the voltage step counter forms a voltage setting instruction according to the voltage switching indication signal and the detected system power supply voltage and outputs the voltage setting instruction to the Boost circuit module to control the Boost circuit module to output a voltage switching behavior;
a clock control module: the clock control module selects a clock with optimized pulse generation frequency and duty ratio according to different Boost voltages in proportion according to a single-step voltage clock demand control signal and a reference clock, and outputs a controlled clock instruction to the Boost circuit module;
boost circuit module: and the Boost circuit module outputs a Boost voltage according to a voltage setting instruction and a controlled clock instruction.
Furthermore, the data segmentation module specifies a minimum time slot for data processing, and segments the audio data stream according to the minimum time slot; the envelope taking part in the envelope taking and filter module obtains the envelope of each section of data so as to obtain the maximum amplitude of each section of data, and the filter part in the envelope taking and filter module performs filter shaping on the obtained continuous sequence of the maximum amplitudes and outputs the filtered sequence.
Further, the voltage setting instruction includes: setting starting and stopping voltage, setting stepping voltage and setting single-step voltage clock requirement; wherein:
the starting and stopping voltage setting comprises setting of a starting voltage target value and a stopping voltage target value, and is used for defining a starting point and a stopping point of each voltage switching process;
the step voltage setting comprises setting a step value for defining the change value of a single step in the voltage switching process;
the single-step voltage clock requirement setting comprises setting of two parameters of clock frequency and duty ratio, and is used for defining a clock corresponding to the single-step voltage.
Further, the principle that the delay matching module specifies the advance hysteresis margin of the Boost voltage is as follows:
when the Nth section of data is processed by the signal processing module and indicates that high voltage is needed, setting the advance allowance of the Boost voltage output by the Boost circuit module at the moment as M minimum time slots;
when the (N + 1) th stage data does not need high voltage, the Boost voltage output by the Boost circuit module is removed under the condition that continuous M +1 stage data does not need high voltage, and the hysteresis margin at the moment is set as M +1 minimum time slots.
Further, the M value is set to be 1-2.
The present embodiment is described in further detail below with reference to the accompanying drawings.
As shown in fig. 2, an adaptive Boost circuit device suitable for a digital audio chip is provided (in which the gray portion shows a data path, which is not the content of the present embodiment). The Boost circuit module (hereinafter referred to as Boost) in the embodiment provides a power supply for the ClassD power amplifier. At the moment that each piece of data is output by the power amplifier, the Boost circuit module of the embodiment needs to match the voltage with enough high, so that the data is not subjected to topping distortion when the power amplifier plays; also this matching voltage cannot be too high for power saving.
The arrows in fig. 2 are data flow or control flow directions.
In this embodiment:
the digital audio interface is a plurality of standards, and the audio decoding module is a decoder corresponding to the standards.
The signal processing module is used for segmenting the decoded data stream and then carrying out envelope taking and filtering processing; the module can be realized by a digital circuit and is suitable for a BCD process.
The data segmentation module also specifies a minimum time slot for data processing, which is designed to be configurable.
Specifically, the method comprises the following steps:
the self-adaptive Boost circuit device suitable for the digital audio chip provided by the embodiment is designed to control the output voltage of the Boost so that the output voltage changes in real time along with the requirement of a power amplifier. The present embodiment adopts a data segmentation mode, and each segment of data can obtain a required voltage value after signal processing.
The envelope of the section of data can be obtained by envelope taking in the signal processing module, and then the maximum amplitude value is obtained and used as the basis for selecting Boost voltage.
Continuous data segmentation is carried out to obtain continuous maximum amplitude information, and a filter in a module in signal processing can carry out filter shaping on the maximum amplitude sequence. In principle, in order to ensure that no distortion occurs, the Boost action requires immediate response; correspondingly, the Boost action must be considered for the following 1 to 2 segments, and the Boost action can be reduced only if no Boost requirement exists.
The time slot or duration of the segment is limited in size. If the length is too long, the Boost adjustment is rare, and the requirement for improving the efficiency is not met; if the short circuit is too short, Boost adjustment is frequent, and EMI problem is caused. This minimum time slot can be set to an interval of 0.1ms to 5ms empirically.
And obtaining required Boost output information by the signal processing module and considering the amplitude margin, and acting on the Boost by the delay matching module.
The delay matching module takes the minimum time slot as a unit and specifies the margin of the Boost for the voltage output to lag ahead.
The Vbat real-time following module detects the system power supply voltage.
Specifically, the method comprises the following steps:
vbat means the system supply voltage, and the handheld device is powered by a battery, which voltage is not constant and varies with the battery level. The embodiment accurately controls the start point and the stop point of boost voltage change along with vbat in real time.
The phase-locked loop module provides a reference clock for the Boost booster circuit.
The behavior of the voltage step counter controlling the switching of the Boost output voltage comprises the following steps:
setting a starting and stopping voltage;
setting a stepping voltage;
single step voltage clock demand setting.
Specifically, the method comprises the following steps:
as shown in fig. 3, there are multiple Boost voltage settings during the Boost voltage switching. The present embodiment employs a voltage stepping approach to generate a smooth voltage switching process.
Due to the characteristics of the Boost circuit topology, the requirements of Boost on clocks are different for different output voltages. Therefore, the present embodiment generates clocks with different frequencies and duty ratios corresponding to each Boost voltage point in the switching process.
And the clock control module generates clocks with optimized frequency and duty ratio aiming at different Boost voltages according to the control signals of the voltage stepping counter.
Specifically, the method comprises the following steps:
the clock is generated by a phase locked loop, which is a well established technology. Here the output of the phase locked loop is processed in a targeted way, such as by scaling the pulses to obtain a suitable frequency and duty cycle.
In this embodiment:
the power amplifier can be Class AB, Class D, etc.
The digital audio interface may be a variety of standards (such as, but not limited to, I2S), and the audio decoding module is a decoder corresponding to the standard.
And the signal processing module is used for segmenting the decoded data stream and then carrying out envelope taking and filtering processing. The module can be realized by a digital circuit and is suitable for a BCD process.
This sub-module of the data segmentation module also specifies the minimum time slot for data processing, which is designed to be configurable.
And obtaining required Boost output information by the signal processing module and considering the amplitude margin, and acting on the Boost by the delay matching module.
And the delay matching module realizes the time matching of the final Boost output and the output of the power amplifier. As shown in fig. 1, when the audio power changes, to ensure the sound quality (no topping occurs), the Boost output needs to be stabilized at a higher voltage in advance and switched to a lower voltage in a delayed manner. The delay matching module actually specifies the margin for the advance lag of the Boost voltage in units of the aforementioned minimum time slot. The module may be implemented in digital circuitry.
If the nth data is processed to indicate that a high voltage is needed, the Boost circuit must prepare the high voltage in advance to cover the system error, so as to avoid the occurrence of topping, and the advance can be set to M minimum time slots.
If the N +1 data does not need high voltage, the Boost circuit can return to low voltage, but if the N +2 data needs high voltage, the continuous M +1 data can be removed when the low voltage is defined, and the hysteresis quantity is used.
This is a Boost high voltage entering and removing process, and is also a consideration in avoiding clipping distortion and improving power efficiency. M can be set to 1-2 empirically.
The minimum slot and advance retard margins are shown in fig. 5. In fig. 5:
the horizontal axis is time, and a minimum time slot is formed between each vertical dotted line;
taking 3-level Boost voltage self-adaptation as an example;
the voltage switching is completed in a minimum time slot;
the higher voltage is established M (M ═ 1) minimum time slots ahead. Avoiding topping, which is the amount of advance;
after all the M +1 (M ═ 1) minimum time slots are confirmed to be the lower voltage, the lower voltage is really switched to, so that frequent switching is avoided, and the time slots are hysteresis;
therein, slots (1 advance and 2 retard) as margins are marked with hatched portions in fig. 5.
The behavior of the voltage step counter controlling the switching of the Boost output voltage comprises the following steps: setting a starting and stopping voltage; setting a stepping voltage; single step voltage clock demand setting. The module may be implemented in digital circuitry.
After the start-stop voltage is determined, the rising and falling processes of the Boost voltage switching process provided by this embodiment are precisely controlled, and how many steps to walk, how long each step to walk, and what clock to use for each step are preset, as shown in fig. 6. In fig. 6:
the horizontal axis is time, describing the details of voltage switching (rising, falling);
when the Boost is in a following state, a clock is not needed (the Boost topology is determined), the output voltage of the Boost is equal to the power supply voltage, and the Vbat1 and the Vbat2 in the figure represent different values, which indicates that the power supply voltage changes; wherein, fig. 6 illustrates that "N single steps in total" are between vbat and Boost steady-state voltages, and then the descending process is changed into "N' single steps";
the working clock of Boost steady-state voltage is 1 time clock;
the frequency and the duty ratio of the 2-minute clock are 1/2 times of the 1-time clock, and so on;
each voltage step can be set in the range of 100mV-400 mV;
the design of the whole switching process strives to be smooth and improve EMI.
The clock is not uniform throughout the voltage switching process, and the duration of each voltage point is not uniform.
The clock control module generates clocks with optimized frequency and duty ratio aiming at different Boost voltages according to the control signals of the voltage stepping counter so as to reduce the ripple waves of the Boost voltages. The phase-locked loop module generates a base clock, which is decimated by the module according to the frequency and duty cycle requirements.
The self-adaptive Boost circuit device suitable for the digital audio chip provided by the embodiment realizes the Boost voltage switching (taking Boost three-level voltage self-adaptation as an example) shown in fig. 1, so that the real-time power of an audio signal is matched, and the switching process is finely controlled. The power supply efficiency is improved on the premise of ensuring the tone quality.
The embodiment can be used for realizing Boost multi-level voltage adaptation, wherein Vbat is an application system power supply voltage.
The embodiment controls Boost output to be adaptive to the real-time power of the audio signal;
in the embodiment, when the audio power is increased, the Boost jumps in advance and is stabilized at a higher voltage, and when the power is reduced, the Boost jumps in a lagging way; this ensures that the audio power amplifier does not clip.
The embodiment controls the switching process of the Boost voltage, reduces the output ripple of the Boost and improves the EMI.
The embodiment can be used for a digital audio chip of an integrated Boost circuit, is simple and reliable to realize, and is suitable for a submicron or deep submicron BCD manufacturing process.
The embodiment improves the original Boost circuit, and can control the voltage switching process with high precision.
The self-adaptive Boost circuit device suitable for the digital audio chip provided by the embodiment of the invention is suitable for digital interface audio; accurately aligning the Boost voltage and the audio data; and precisely controlling the change process of the Boost voltage. Therefore, the scheme comprehensively considers the power efficiency and the EMI.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (4)
1. An adaptive Boost circuit arrangement for a digital audio chip, comprising:
digital audio interface: the digital audio interface provides audio output interfaces with various standards and outputs audio data streams to the audio decoding module;
an audio decoding module: the audio decoding module decodes the audio data stream and outputs the audio data stream to the signal processing module;
the signal processing module: the signal processing module comprises a data segmentation module and an envelope taking and filter module, and the decoded audio data stream forms continuous segmented data through the data segmentation module, then is subjected to envelope taking and filtering processing through the envelope taking and filter module and then is output to the delay matching module;
a delay matching module: the delay matching module takes the minimum time slot as a unit, and regulates the early lagging allowance of the Boost voltage output by the Boost circuit module according to the voltage required by the audio data stream after signal processing to form a voltage switching indication signal and output the voltage switching indication signal to the voltage step counter;
vbat real-time following module: the Vbat real-time following module detects the system power voltage in real time and outputs the detected system power voltage to a voltage step counter;
a phase-locked loop module: the phase-locked loop module provides a reference clock for the Boost circuit module and outputs the reference clock to the clock control module;
a voltage step counter: the voltage step counter forms a voltage setting instruction according to the voltage switching indication signal and the detected system power supply voltage and outputs the voltage setting instruction to the Boost circuit module to control the Boost circuit module to output a voltage switching behavior;
a clock control module: the clock control module selects a clock with optimized pulse generation frequency and duty ratio according to different Boost voltages in proportion according to a single-step voltage clock demand control signal and a reference clock, and outputs a controlled clock instruction to the Boost circuit module;
boost circuit module: the Boost circuit module outputs a Boost voltage according to a voltage setting instruction and a controlled clock instruction;
the voltage setting instruction includes: setting starting and stopping voltage, setting stepping voltage and setting single-step voltage clock requirement; wherein:
the starting and stopping voltage setting comprises setting of a starting voltage target value and a stopping voltage target value, and is used for defining a starting point and a stopping point of each voltage switching process;
the step voltage setting comprises setting a step value for defining the change value of a single step in the voltage switching process;
the single-step voltage clock requirement setting comprises setting of two parameters of clock frequency and duty ratio, and is used for defining a clock corresponding to the single-step voltage.
2. The adaptive Boost circuit arrangement for a digital audio chip according to claim 1, wherein said data segmentation module specifies a minimum time slot for data processing and segments the audio data stream according to the minimum time slot; the envelope taking part in the envelope taking and filter module obtains the envelope of each section of data so as to obtain the maximum amplitude of each section of data, and the filter part in the envelope taking and filter module performs filter shaping on the obtained continuous sequence of the maximum amplitudes and outputs the filtered sequence.
3. An adaptive Boost circuit arrangement suitable for use in a digital audio chip according to claim 1, wherein the principle that the delay matching module specifies the Boost voltage advance hysteresis margin is:
when the Nth section of data is processed by the signal processing module and indicates that high voltage is needed, setting the advance allowance of the Boost voltage output by the Boost circuit module at the moment as M minimum time slots;
when the (N + 1) th segment of data does not need high voltage, the Boost voltage output by the Boost circuit module is removed under the condition that continuous (M + 1) th segment of data does not need high voltage, and the hysteresis margin at the moment is set as M +1 minimum time slots;
the M value is set to be 1-2.
4. An adaptive Boost circuit arrangement suitable for use in a digital audio chip according to any of claims 1 to 3, characterized in that the minimum time slot is set to 0.1-5 ms.
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| CN113395637B (en) * | 2021-06-10 | 2022-09-09 | 上海傅硅电子科技有限公司 | Control method for output voltage of audio power amplifier chip |
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| US9837962B2 (en) * | 2013-06-06 | 2017-12-05 | Qualcomm Incorporated | Envelope tracker with variable boosted supply voltage |
| US9559642B2 (en) * | 2015-01-02 | 2017-01-31 | Logitech Europe, S.A. | Audio delivery system having an improved efficiency and extended operation time between recharges or battery replacements |
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