Class S power amplifier 01

The Class S amplifier consists of a front-stage main voltage amplifier and a rear-stage current amplifier. The essence lies in the simple concept of using the Wheatstone bridge to maintain
balance, making the main voltage amplifier almost work in the ideal Class A state of equivalent no load, which is even more rare. It is the characteristics of this
equivalent no-load state and the actual load. Regardless of type and size. Figure 6-2(a) is the basic form of Class S circuit ; Figure
6-2(h) is the basic form of Class AA pre-stage circuit that readers are more familiar with. The difference is that the feedback resistor Rc (or network) of Class AA
is from The output stage feeds back to the previous stage to form a large loop
feedback, while the R. It is just a partial feedback of the front-stage main voltage
amplifier. Use an oscilloscope to carefully compare
the output waveforms. There is indeed no difference within 20kHz
. However, when the power output is greater than 10W at 50kHz
, the distortion of the Class S circuit is smaller. It
can be seen that the Class S circuit is a more reasonable broom
    speaker and analyzer. The frequency network and speaker cables make
the speaker a complex compound changing load. Even the nominal impedance change in the frequency band of some famous brand fever speakers
is more than 1 times. The advantages of the Class S amplifier are fully exerted. Due to the insensitivity to load changes, it is not sensitive to load changes. Various loads can provide close to ideal
driving t, making the replay frequency characteristics of Class S amplifiers very superior.
    The Class S amplifier greatly reduces crossover distortion and other distortions due to the bridge balancing effect, so that there is no need to
bias the power tube. This is another advantage of the Class S amplifier, which makes it have the low power consumption and high power of Class B. High efficiency, and has the advantages of Class A low distortion
.