LOW-POWER AUDIO AMPLIFIER ICs THROUGH MULTI-LEVEL TECHNIQUES Rien oortgiesen March 2018
THE AGENDA FOR TODAY LOW-POWER AUDIO AMPLIFIER ICs 1. INTRODUCTION MERUS AUDIO TIMELINE 2. TRENDS MARKET OPPORTUNITIES 3. EXIMO OUR TECHNOLOGY IN BRIEF 4. PERFORMANCE WHERE IT MATTERS 4. PRODUCTS OUR IC PORTFOLIO 6. DEMO HEAR, SEE & FEEL FOR YOURSELF 2
3 MERUS AUDIO TIMELINE FROM IDEA TO COMMERCIAL SUCCESS 2010 THE FOUNDATION First discrete prototype implementation of an eximo multi-level audio amplifier 2011 THE PATENT APPLICATION First patent filing for the eximo audio amplifier topology.
2015 THE PROMOTION Customer sampling of MA12040 and MA12040P 2014 THE PROOF OF CONCEPT First public demonstration of the MA12040 eximo amplifier IC, at Stanford University
2016 THE LAUNCH Market launch of MA12040, MA12040P, MA12070, MA12070P audio amplifiers 2017 MARKET TRACTION Multiple customer design-wins and initial volume production 2018 Acquisition by Infineon
TRENDS MARKET OPPORTUNITIES
7 AUDIO INDUSTRY TRENDS TIMES ARE CHANGING AUDIO IN EVERY ROOM Multi-zone audio in digital smart homes are setting new standards for pervasive audio HIGH RESOLUTION AUDIO ON-THE-GO Consumers want audio on-demand and on-thego without sacrificing sound quality LOW POWER IoT COMMUNICATION New connectivity technologies and devices are lowering the bar for power consumption VOICE AND GESTURE CONTROL Requires always-on capabilities with lower power consumption
PORTABLE SPEAKER MARKET EXPECTED SHIPMENTS AND GROWTH RATES Mu Parent market: Global Smart Home Market Approx. 132 million Portable Speakers shipped globally in 2017 Shipments expected to grow to over 200 million units by 2021 (>12% CAGR) 250 200 150 100 50 17,9% 16,7% 13,6% 10,1% 8,9% 10,2% 20,0% 18,0% 16,0% 14,0% 12,0% 10,0% 8,0% 6,0% 4,0% 2,0% 0,0% 2016 2017 2018 2019 2020 2021 Shipments Growth rate Source: Technavio Global Portable Speaker Market 2017-2021 8
9 ACTIVE SPEAKER TRENDS CONTINUED NEED FOR HARDWARE DIFFERENTIATION APPLE HOMEPOD EXAMPLE MULTIPLE SPEAKER DRIVERS INNOVATIVE INDUSTRIAL DESIGNS AND NEW FORM FACTORS HIGHER LEVELS OF INTEGRATION IMPROVED SOUND QUALITY LOWER POWER CONSUMPTION STRICT EMC/EMI DESIGN REQUIREMENTS BoM CONTENT REDUCTION
10 THE FUTURE OF AUDIO? THERE MAY BE A LOT OF ADDITIONAL CHANGES ON THE HORIZON Together with Sonos we want to democratize music and sound in the home.. - Björn Block, IKEA Home smart
EXIMO OUR TECHNOLOGY IN BRIEF
12 TRADITIONAL CLASS-D TECHNOLOGY 2-MOSFET half-bridge power stage 2-MOSFET half-bridge Modulation signals PVDD M1 PVDD 0V Vpwm M2 L C Output node has the same pulse frequency as input carrier Output frequency = FET frequency Full voltage swing (0 PVDD) LC filter
13 MULTI-LEVEL AMPLIFIER TECHNOLOGY 4-MOSFET half-bridge power stage 4-MOSFET halfbridge PVDD 2x frequency multiplication ½ voltage swing M1 PVDD M2 Cfly ½ PVDD PVDD ½ PVDD M3 0V M4 ½ PVDD 0V
14 MULTI-LEVEL AMPLIFIER TECHNOLOGY 4-MOSFET half-bridge power stage 4-MOSFET halfbridge No switching at idle PVDD PVDD ½ PVDD PVDD Cfly ½ PVDD 0V ½ PVDD 0V
15 MULTI-LEVEL AMPLIFIER TECHNOLOGY PROPRIETARY AND PATENTED eximo technology eximo amplifiers generate a multi-level output that feature unique advantages over conventional techniques. Conventional 2-level class-d amplifier output. Requires filter components and has a high power loss associated with 2-level switching.
BENEFITS WHY SHOULD I CARE? EFFICIENCY We believe that amplifiers should produce sound in your speakers, not heat to your surroundings COMPACTNESS We believe that smaller and lighter is better. Bulky and heavy is history. INTEGRATION We believe that amplifiers should be heard, not seen. QUALITY We believe that amplifiers should be robust and flexible - not delicate and demanding By challenging conventional wisdom, we are helping our customers create cooler, smaller, lighter and better sounding products for the benefit of all who love audio. 16
PERFORMANCE WHERE IT MATTERS
Normalized Amplitude 18 DYNAMICS OF AUDIO SINE VS. MUSIC artificial audio signal: sine wave RMS value = 0.7 RMS value = 0.12 > factor 5 real audio signal: Norah Jones Time (sec)
BTL Amplitude Output (V) 19 DYNAMICS OF AUDIO SINE VS. MUSIC PVDD = 26 22 Headroom < 1% THD RMS value = 15.5V Sine output power: Instantaneous maximum output power 22^2/4 = 121W Average maximum output power 15.5^2/4 = 60W RMS value = 2.6V Music output power: Instantaneous maximum output power 22^2/4 = 121W Average maximum output power 2.6^2/4 = 1.7W Time (sec) Conclusions: 1. The amplifier average output power for real audio signals are significantly lower compared to sine wave signals 2. The power losses of the amplifier at average output power determines overall efficiency
Input Power (W) 20 POWER CONSUMPTION MERUS AUDIO VS. TRADITIONAL CLASS-D 100 10 Input power vs. Output power Traditional Class-D eximo MA12040 Traditional Class-D amplifiers consume considerable amount of input power (~1W) for realistic audio playback situations 1 0,1 0,001 0,01 0,1 1 10 Output Power (W) Merus Audio multi-level amplifiers consume significantly less input power (~0.25W) for realistic audio playback situations low to medium medium to max headroom Output volume indication for music playback
THD+N (%) THD+N (%) 21 BEST IN CLASS AUDIO PERFORMANCE MA12040 EXAMPLE THD+N vs. Output Power (Power Mode Profile 2) THD+N vs. Frequency (Power Mode Profile 2) 100 100 10 PVDD = 18V Gain = 20dB PMP= 2 Load = 4Ω + 22uH 100Hz 1kHz 6kHz 10 PVDD = 18V Gain = 20dB PMP = 2 Load = 4Ω + 22uH 1W 5W 10W 1 1 0,1 0,1 0,01 0,01 0,001 0,001 0,01 0,1 1 10 100 Output Power (W) 0,001 10 100 1000 10000 Frequency (Hz)
PRODUCTS OUR IC PORTFOLIO
PRODUCT PORTFOLIO MA120XX SERIES MA12040P Digital 2x40W eximo Amplifier IC MA12040 Analog 2x40W eximo Amplifier IC MA12070P Digital 2x80W eximo Amplifier IC MA12070 Analog 2x80W eximo Amplifier IC I2S digital audio input Digital volume control & limiter 4-18V Supply Voltage Analog audio input Selectable Gain (20dB/26dB) 4-18V Supply Voltage I2S digital audio input Digital volume control & limiter 4-26V Supply Voltage Analog audio input Selectable Gain (20dB/26dB) 4--26V Supply Voltage Common features: Multi-level eximo Switching Technology with 3-level and 5-level modulation for ultra-high power efficiency and filter-less amplification Fourth order closed loop feedback error control for HD audio quality and suppression of supply voltage disturbance Low idle power dissipation (100 160mW) Low THD+N (0.003% - 0.007%) Low EMI emission 64-pin thermally enhanced QFN package with pad-down exposed thermal pad (EPAD) for heatsink free operation ALL ICs ARE FULLY QUALIFIED AND IN MASS PRODUCTION 23
DEMO HEAR, SEE & FEEL FOR YOURSELF
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