An asynchronous switching high-end power amplifier
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To browse Academia. Remember me on this computer. Enter the email address you signed up with and we'll email you a reset link. Need an account? Click here to sign up. Download Free PDF. An asynchronous switching high-end power amplifier. Paul van der Hulst. A short summary of this paper. The AES takes no responsibility for the contents. All rights reserved. Reproduction of this paper, or any portion thereof, is not permitted without direct permission from the Journal of the Audio Engineering Society.
This [1][2][3]. In general, the full power. Many of these issues have been subject of Attempts have been made to improve control and reduce dis- detailed studies. However both require lems [6] which in practice limits the gain of the feedback loop. Linearity in the signal frequency band is di- waveform is fed back to the modulator input. This reduces rectly compromised by incorrect timing and slopes of the high- switching errors as well as pulse-height errors resulting from frequency switched waveform.
The distortion sources can be a modulated DC supply. Modulation errors. This paper presents a modulator and controller that solve all b non-linearities in the triangular waveform in these problems in a unique way.
The switching frequency will 3. By replacing the comparator with a a load dependent frequency transfer and corre- hysteresis circuit, the oscillation can be slowed down.
The current through the inductor iL is the integral of the bridge voltage Ubridge minus the nearly Fig. A typical value for audio application is nal current 0A. Unfortunately, this setup is of controller. This is probably due to its seeming lack measurement. If the error is ultrasonic however, Capacitor current feedback the hysteresis controller can be put to practical use even in Because the capacitor impedance is much lower than the load high end audio. Figure 3 shows the unknown audio component, the desired audio component in most important signals, assuming DC input.
The behaviour iC is known exactly: iC is the mathematical derivative of the of the hysteresis modulator is as follows: the hysteresis cir- output signal Uout. Through the negative feedback and the integra- dt tor, Ucontrol will be rising. Again, it is the derivative of the reference voltage Uref. The hys- such as quantisation errors and idle tones. Furthermore, be- teresis circuit tries to keep the capacitor current error around cause there is no quantisation, no noiseshaping is necessary, zero.
In order to improve performance, an additional pro- at the input. The prototype had a dead loop is limited. The reason for this is that the current feed- time of over ns and a delay of 20ns from controller back loop should stay dominant at high frequencies in order output to bridge output.
Several pre-production prototypes have been integrating action to the controller. The model of the hys- built by Mueta b. Conventional modulators make a transparent signal to PWM Vertical scales in the plots are in dBV, so maximum out- translation, either explicitly like sine-triangle modulation or put is 29dBV. In order to correctly asses the perfor- ulators with bridge output feedback. Figure 10 shows THD versus frequency at 10W ter, the delay of the modulator and the presence of remaining and W.
The distortion is extremely low for a switching switching ripple. In contrast to conven- shows the THD versus power with an input signal of 1kHz. The modulator 1 The invention will commercially be exploited by Mueta b. Signal frequency was 1kHz. Another measurement, possibly correlating more with sub- A more elaborate test is a multi-tone test over the full au- jective audio quality is the inter-modulation test. First in dio frequency spectrum. The disk input of 6 tones per octave from 20Hz to 20kHz.
The 18kHz inter- inter-modulation products are below dBV over the full modulation product does exist, but is well below dB. This audio frequency band. The degradation at lower frequencies is an exceptionally low value, even for a linear class A am- is an artefact of Audio Precision. The advantages of applying feedback are obvious: the quali- tative demands on the modulator, the power bridge and the Fig.
This is only possible if the loop power is 5W. The dynamic range is controller they will never be able to exploit feedback to the therefore over dB. Goldberg, M. Combined with a bridge with No. Risbo, H. Risbo, T. Morch, Performance of an all-digital power amplification system , th Audio Engineering Society Convention, Amsterdam, preprint , [5] Niels Anderskouv, Lars Risbo, A method of reducing dis- tortion and noise of square-wave pulses, a circuit for generating minimally distorted pulses and use of method and the circuit, Int.
An- dersen, High fidelity pulse width modulation amplifiers based on novel double loop feedback techniques , Preprint , th AES convention, [7] Karsten Nielsen, Audio power amplifier techniques with energy efficient power conversion, Ph. Mosely, P. Mellor, C. Bingham, Effects of dead time on harmonic distortion in class-D audio power am- plifiers, electronics letters, 10th June , Vol.
Hiorns, J. Gray, Spectral analysis of quantisation noise in a single loop sigma-delta modulator with dc input , IEEE transactions on communications, Vol. Domensino, Amplifier circuit, Int. Implementation of a new structure for a closed-loop class D amplifier By Victor Pires. Rabary , and Cecile Specq. Download pdf.
An asynchronous switching high-end power amplifier
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Stereo Integrated Amplifier SU-G700
Reference-class High-quality Audio Technology. Inheriting the reference-class audio technology concept, the JENO Engine transmits and processes audio signals in full digital and with minimal jitter from the input stage to the power stage. Speaker load adaptive phase calibration LAPC ensures ideal gain and phase characteristics for any type of speaker. The newly developed low-distortion switching power supply realises accurate power supply by suppressing switching frequency fluctuations caused by load shifting. In order to faithfully transmit the massive amount of audio data sent to the speakers without loss, the SU-G power amp section uses full digital amplification employing the JENO Engine, based on the design concept of reference systems. In order to solve the issue of sound quality degradation due to jitter, which poses problems for conventional digital amplifiers, the SU-G has an original jitter reduction circuit that eliminates jitter over the entire audible frequency range.
XPA-3 Gen3 3 Channel Audiophile Home Theater Power Amplifier
PS Audio is an American company specializing in high-fidelity audio components also known as high-end audio equipment for audiophiles and the sound recording industry. It currently produces audio amplifiers , preamplifiers , power related products, digital-to-analog converters , streaming audio , music management software and cables. PS Audio was founded in and shipped its first products in It was started by audio designers Paul McGowan and Stan Warren with whose initials the company was named. Warren left the company in the early s to form Superphon. His position as audio designer and co-owner was assumed by Dr. Bob Odell, an audio designer who had created notable Harman Kardon designs. During this time, the company introduced their Ultra series of products, based on technology developed by the Ultra Analog Corporation, including the UltraLink DAC Stereophile magazine product of the year and Lambda transport.
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Effective date of registration : Address after : American California. Applicant after : Snaptrack, Inc. Address before : cambridge.
Are the ambitious Edge streaming preamp and power amp combo the considerable bargain they appear to be? Continue Reading ». Company co-founder Lee Taylor has sought to improve and update the design, seeing what extra magic could be achieved with new, modern components and approaches, without changing the qualities reached a decade ago. The Hydra II Anniversary Edition is an intelligent and flexible stereo power amplifier that can also be bridged for use as a monoblock, should you lust for even more power. Rated at W power output per channel into 8ohm, it may not appear overly muscular but it is claimed to tolerate even the most recalcitrant of loudspeakers.
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