For audio power amplifiers, Class D amplifiers have EMC/EMI problems (such as interference with FM) because their output waveform is the same as PWM (switching mode). The current solution may be to add inductors, but inductance will increase material costs. Therefore, how to remove inductors or use cheaper magnetic beads while passing EMC/EMI specifications and effectively providing system reliability will be a major topic for the future.
Zhang Peilin, technology sales manager at Anpec, said that due to energy conservation trends, Class AB amplifiers may disappear in the market and be replaced by Class D amplifiers. In terms of low power, due to the advancement of Class D technology and the maturity of the process, a single independent Class D amplifier will be gradually integrated into the main chip or SOC. Therefore, independent amplifiers will be less and less in the future. In terms of high power, the integration of high-voltage processes is not easy, so it will still be based on a single Class D amplifier.
Class AB and Class D amplifiers currently have some gaps in performance, so the future Class D amplifiers will gradually move closer to a closed-loop architecture, narrowing the performance gap with Class AB amplifiers. Class D amplifiers will also go digital input. The main considerations for audio circuit design are the PCB layout and the problem of immunity to interference.
Wu Zuheng, general manager of Mixinno Microelectronics, believes that the audio amplifier market has a very promising market. The development trend of consumer electronics equipment is light and portable. The audio amplifier technology development trend will certainly follow this mainstream product development trend, especially portable audio products. In order to make the product lighter and smaller and keep playing longer, the audio amplifier's efficiency requirements are even higher.
Wu Zuheng stated that, unlike some other companies, Sino Microelectronics did not participate in the low-end market of audio amplifiers. Instead, it used its technical advantages and understanding of the market and customers' needs now and in the future to create higher-value audio amplifiers. He pointed out that "when the price of a SOP8 package Class AB amplifier is 0.2 yuan or less, its quality is definitely a problem!" Qino Microelectronics audio amplifier is mainly located in the middle and high-end markets, offering product thresholds. Higher Class D and Class F amplifiers.
Many people think that Class D power amplifiers, like DC/DC, are completely PWM switch control power supplies. However, if we really understand the Class D power amplifier, we will find that only the SNR index, the domestic and even foreign companies that can achieve 98 dB of Class D power amplifiers are handy. However, after many years of technical precipitation and many experience accumulations, Sino Microelectronics has mastered this technology.
"Maoda's amplifiers are not inferior to foreign companies, but they provide greater flexibility and competitiveness in terms of service and price," said Zhang Senlin. In terms of prevention and control of demolition noise (POP noise), Mauda's chips have been able to synchronize with the technology of world-class manufacturers. MOODA offers a complete line of amplifiers, from line drivers, headphone drivers to Class AB, Class D amplifiers, and more. And continue to develop new technologies, such as automatic gain control (AGC), zero cross, no filter and digital signal input technology.
The APA316X amplifier series is a product launched by Maoda for the TV amplifier market (Figure 1). The series uses digital input, built-in 7-segment speaker (EQ) and dynamic range control (DRC), can meet the general adjustment needs and protect the speaker's requirements. The APA2171 power amplifier uses a single 3.3V power supply and can provide 2Vrms output. The output of this product does not require an external capacitor, so the low frequency response is much better than the traditional architecture. The APA2603A/B Series amplifiers provide 64 steps of DC volume adjustment and can output 2.5W/4Ω/5V signals. This series integrates AGC internally to protect the horn and prevent the speaker from burning out when the input signal is too large.
Sinomax Microelectronics launched its Class F amplifier innovation in 2011. The company launched an innovative Class-F audio amplifier from an application perspective when it faced the challenges of the FM system in the face of PWM-mode Class-D amplifiers (Figure 2). After more than two years of marketing, Class F audio amplifiers have finally gained market recognition.
After two years of research and development, the F amplifier series has improved both in quality and innovation. Currently, Sino Microelectronics has completed the mass production of single-channel, stereo 3W series products, and 5W products will also be mass-produced in the fourth quarter of this year. Class F audio amplifiers have been widely accepted and adopted by mainstream brand customers. Although Class F is more expensive than Class AB and Class D audio amplifiers, it has the advantage of high efficiency and can improve battery life by 2 to 4 times. In this way, under the condition that the playing time is not changed, the F class amplifier can reduce the battery capacity, thereby saving the overall material cost of the speaker system.
Minnuo Microelectronics has mass-produced high-performance 5W Class D amplifiers and officially entered the 2.1 active speaker area. At present, Microlab audio has been sampled. In the fourth quarter, the company will also introduce a Class F amplifier MIX2009 with an output power of 5~6W. This innovative product will provide a technical upgrade for the highly competitive small speaker products, especially the loudspeaker products, and have the opportunity to become a Bluetooth speaker. Mainstream products.
The pursuit of low-power, high-precision op amps in high-performance op amps is a field that is constantly emerging to newer needs. From process parameters (such as low-frequency noise parameters) to high-pressure, high-precision design architecture, to unity-gain stability of the op amp and the smoothness of the frequency response curve, etc., constantly challenge the analog designer to make constant innovations and products. Optimize the design.
Deng Shaomin, vice president of sales/marketing at Dioo Microelectronics, believes that high-performance amplifiers are accelerating toward low power consumption, low noise, and high precision. With the development of smart phones, peripheral power detection and home medical markets, high-performance amplifiers will have a strong market demand, mainly reflected in the following three aspects:
The demand for accuracy of battery power detection for large-capacity smart phones has stimulated the high-precision op amp market based on current detection. This will inevitably replace the conventional detection circuit based on voltage detection power. The security home market (such as carbon monoxide and smoke detection sensors) will drive the low-voltage (as low as 1.4V), low-power (less than 1μA) high-performance op amp market. The traditional op amp can't meet the needs of the market because its working voltage is more than 2.7V. The medical market, especially handheld medical devices (such as oximeters, blood glucose meters, and sports watches) will become increasingly popular in home applications (Figure 3). The low-power (mA-level), ultra-low input deviation (Vos<1mV), and high slew rate op amp market will grow significantly to meet the full bandwidth requirements of product designs. In such applications, products based on ultra-low input bias currents based on CMOS designs will replace operational amplifiers based on bipolar designs.
Dior Microelectronics' operational amplifier products cover a full range of products from low power consumption to high bandwidth and high precision. Thanks to patented low-power design technology, most of its op amp products consume less than 50% of the power consumption of competitors, while all products have an ESD performance (HBM mode) of 8kV and CDM mode of 2kV. AW Microelectronics' op amps can operate at a minimum of 1.2V, and the power consumption changes little with changes in the power supply Vcc. At the same time, the bias currents of the company's op amps are very low (a few pA). In many sensor applications where current sampling is required, current-to-voltage conversion can be implemented directly.
The typical harmonic distortion of DIO Microelectronics' audio amplifier products, the DIO2113 and DIO2112, is 0.0006%, providing a tiny 1.8 x 1.8mm package. At the same time, the ultra-low input deviation constant (Vos<1mV) ensures that the product's power-on noise is almost negligible. The deviation of some competitors in the market is as high as 5mV.
Audio amplifiers are different from amplifiers. Its power output is small, mainly used in audio line output. Its load is mainly 600Ω to 10kΩ load, the output swing is greater than 3V RMS. And the power amplifier's load is the horn (such as 8Ω, 4Ω), etc., generally larger output current. In terms of output power, the demand for power amplifiers in the current handheld device market is usually above 1 W, and household appliances will reach over 10 W.
Zhang Peilin, technology sales manager at Anpec, said that due to energy conservation trends, Class AB amplifiers may disappear in the market and be replaced by Class D amplifiers. In terms of low power, due to the advancement of Class D technology and the maturity of the process, a single independent Class D amplifier will be gradually integrated into the main chip or SOC. Therefore, independent amplifiers will be less and less in the future. In terms of high power, the integration of high-voltage processes is not easy, so it will still be based on a single Class D amplifier.
Class AB and Class D amplifiers currently have some gaps in performance, so the future Class D amplifiers will gradually move closer to a closed-loop architecture, narrowing the performance gap with Class AB amplifiers. Class D amplifiers will also go digital input. The main considerations for audio circuit design are the PCB layout and the problem of immunity to interference.
Wu Zuheng, general manager of Mixinno Microelectronics, believes that the audio amplifier market has a very promising market. The development trend of consumer electronics equipment is light and portable. The audio amplifier technology development trend will certainly follow this mainstream product development trend, especially portable audio products. In order to make the product lighter and smaller and keep playing longer, the audio amplifier's efficiency requirements are even higher.
Wu Zuheng stated that, unlike some other companies, Sino Microelectronics did not participate in the low-end market of audio amplifiers. Instead, it used its technical advantages and understanding of the market and customers' needs now and in the future to create higher-value audio amplifiers. He pointed out that "when the price of a SOP8 package Class AB amplifier is 0.2 yuan or less, its quality is definitely a problem!" Qino Microelectronics audio amplifier is mainly located in the middle and high-end markets, offering product thresholds. Higher Class D and Class F amplifiers.
Many people think that Class D power amplifiers, like DC/DC, are completely PWM switch control power supplies. However, if we really understand the Class D power amplifier, we will find that only the SNR index, the domestic and even foreign companies that can achieve 98 dB of Class D power amplifiers are handy. However, after many years of technical precipitation and many experience accumulations, Sino Microelectronics has mastered this technology.
"Maoda's amplifiers are not inferior to foreign companies, but they provide greater flexibility and competitiveness in terms of service and price," said Zhang Senlin. In terms of prevention and control of demolition noise (POP noise), Mauda's chips have been able to synchronize with the technology of world-class manufacturers. MOODA offers a complete line of amplifiers, from line drivers, headphone drivers to Class AB, Class D amplifiers, and more. And continue to develop new technologies, such as automatic gain control (AGC), zero cross, no filter and digital signal input technology.
The APA316X amplifier series is a product launched by Maoda for the TV amplifier market (Figure 1). The series uses digital input, built-in 7-segment speaker (EQ) and dynamic range control (DRC), can meet the general adjustment needs and protect the speaker's requirements. The APA2171 power amplifier uses a single 3.3V power supply and can provide 2Vrms output. The output of this product does not require an external capacitor, so the low frequency response is much better than the traditional architecture. The APA2603A/B Series amplifiers provide 64 steps of DC volume adjustment and can output 2.5W/4Ω/5V signals. This series integrates AGC internally to protect the horn and prevent the speaker from burning out when the input signal is too large.
Sinomax Microelectronics launched its Class F amplifier innovation in 2011. The company launched an innovative Class-F audio amplifier from an application perspective when it faced the challenges of the FM system in the face of PWM-mode Class-D amplifiers (Figure 2). After more than two years of marketing, Class F audio amplifiers have finally gained market recognition.
After two years of research and development, the F amplifier series has improved both in quality and innovation. Currently, Sino Microelectronics has completed the mass production of single-channel, stereo 3W series products, and 5W products will also be mass-produced in the fourth quarter of this year. Class F audio amplifiers have been widely accepted and adopted by mainstream brand customers. Although Class F is more expensive than Class AB and Class D audio amplifiers, it has the advantage of high efficiency and can improve battery life by 2 to 4 times. In this way, under the condition that the playing time is not changed, the F class amplifier can reduce the battery capacity, thereby saving the overall material cost of the speaker system.
Minnuo Microelectronics has mass-produced high-performance 5W Class D amplifiers and officially entered the 2.1 active speaker area. At present, Microlab audio has been sampled. In the fourth quarter, the company will also introduce a Class F amplifier MIX2009 with an output power of 5~6W. This innovative product will provide a technical upgrade for the highly competitive small speaker products, especially the loudspeaker products, and have the opportunity to become a Bluetooth speaker. Mainstream products.
The pursuit of low-power, high-precision op amps in high-performance op amps is a field that is constantly emerging to newer needs. From process parameters (such as low-frequency noise parameters) to high-pressure, high-precision design architecture, to unity-gain stability of the op amp and the smoothness of the frequency response curve, etc., constantly challenge the analog designer to make constant innovations and products. Optimize the design.
Deng Shaomin, vice president of sales/marketing at Dioo Microelectronics, believes that high-performance amplifiers are accelerating toward low power consumption, low noise, and high precision. With the development of smart phones, peripheral power detection and home medical markets, high-performance amplifiers will have a strong market demand, mainly reflected in the following three aspects:
The demand for accuracy of battery power detection for large-capacity smart phones has stimulated the high-precision op amp market based on current detection. This will inevitably replace the conventional detection circuit based on voltage detection power. The security home market (such as carbon monoxide and smoke detection sensors) will drive the low-voltage (as low as 1.4V), low-power (less than 1μA) high-performance op amp market. The traditional op amp can't meet the needs of the market because its working voltage is more than 2.7V. The medical market, especially handheld medical devices (such as oximeters, blood glucose meters, and sports watches) will become increasingly popular in home applications (Figure 3). The low-power (mA-level), ultra-low input deviation (Vos<1mV), and high slew rate op amp market will grow significantly to meet the full bandwidth requirements of product designs. In such applications, products based on ultra-low input bias currents based on CMOS designs will replace operational amplifiers based on bipolar designs.
Dior Microelectronics' operational amplifier products cover a full range of products from low power consumption to high bandwidth and high precision. Thanks to patented low-power design technology, most of its op amp products consume less than 50% of the power consumption of competitors, while all products have an ESD performance (HBM mode) of 8kV and CDM mode of 2kV. AW Microelectronics' op amps can operate at a minimum of 1.2V, and the power consumption changes little with changes in the power supply Vcc. At the same time, the bias currents of the company's op amps are very low (a few pA). In many sensor applications where current sampling is required, current-to-voltage conversion can be implemented directly.
The typical harmonic distortion of DIO Microelectronics' audio amplifier products, the DIO2113 and DIO2112, is 0.0006%, providing a tiny 1.8 x 1.8mm package. At the same time, the ultra-low input deviation constant (Vos<1mV) ensures that the product's power-on noise is almost negligible. The deviation of some competitors in the market is as high as 5mV.
Audio amplifiers are different from amplifiers. Its power output is small, mainly used in audio line output. Its load is mainly 600Ω to 10kΩ load, the output swing is greater than 3V RMS. And the power amplifier's load is the horn (such as 8Ω, 4Ω), etc., generally larger output current. In terms of output power, the demand for power amplifiers in the current handheld device market is usually above 1 W, and household appliances will reach over 10 W.
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