Analog Switching Amplifier Technology
NuForce™ amplifier technology is based upon the principle that a power oscillator can be modulated by an audio signal so that it produces an amplified audio signal obtained with a reconstruction filter, without the bandwidth limitation of a fixed frequency carrier-based conventional PWM control. It uses a high-performance analog modulation technique and a close-loop control system. Therefore NuForce refers to its audio amplifier as Analog Switching Amplifier.
NuForce believes that uncompromising real world music reproduction can only be achieved by having:
High Bandwidth
NuForce™ Analog Switching Amplifier provides a ruler-flat response from 5 to 100,000 Hz. Only a handful of very expensive high-end linear amplifiers have a bandwidth of 20-100,000Hz. Most linear or digital switching amplifiers hardly achieve 20-20,000Hz of bandwidth.
Low Distortion
The majority of today's amplifiers provides a good number, typically less than 0.1% of Total Harmonic Distortion (THD), when measured at 1W using a 1000Hz sine wave. The manufacturers of these amplifiers do not tell you that at full power, the distortion of their amplifiers could be 10 to 100 times worse, and at higher frequencies, their distortion increases further. NuForce's patent pending technologies actively cancel out the distortion at every cycle of operation. As a result, NuForce's analog switching amplifier has the same low distortion characteristic independent of and indifferent to the output power level or audio frequency.
Unique close-loop design
Unlike the Class-D amplifier, NuForce's analog switching amplifier does not require a sawtooth waveform for modulation, but a proprietary naturally occurring modulating signal. In conjunction with taking the signal at the loudspeaker terminals thereby eliminating all distortions, NuForce's natural switching signal does not add noise into the system. NuForce™ amplifier also does not suffer from the 180-degree phase shift caused by the output filter.
The high bandwidth and unique close-loop system provide very high forward gain, well beyond the audio frequency range, at up to 10 MHz. All non-linearities are hence greatly reduced to achieve an operating power bandwidth as high as 150 kHz, while at the same time maintaining a consistently low distortion across that frequency spectrum.