Audio Power Amplifier Frequency Compensation

The solution is to compensate the amplifier in terms of frequency response by using a frequency compensation circuit across the operational amplifier.

Audio power amplifier frequency compensation. In an integrated circuit audio power amplifier a 6 db per octave frequency gain roll off is obtained in a conventional manner by converting a high gain inverter to an integrator and driving the integrator from a current source. The main benefit of a directly coupled output is improved bass response. An audio power amplifier or power amp is an electronic amplifier that amplifies low power electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is high enough for driving loudspeakers or headphones audio power amplifiers are found in all manner of sound systems including sound reinforcement public address and home audio systems and musical. Ab a car audio power amplifier is presented that uses a frequency compensation scheme which avoids large compensation capacitors around the mos power transistors while retaining the bandwidth and stable load range of nested miller compensation.

A frequency compensation technique for mos audio power amplifiers is presented that allows the frequency compensation capacitors around the power transistors to be smaller than the circuit. Thd is 0 005 1khz 10w snr is 108db and the amplifier is stable for any passive load up to. Since the design eliminates the dc blocking capacitor its low frequency transfer characteristics are significantly improved. Dominant pole compensation is the simplest kind though its action is subtle.

This article describes a technique to compensate the dc voltage drift in the output of a directly coupled ab class audio power amplifier. Thd is 0 005 1khz 10w snr is 108db and the amplifier is stable for any passive load up to 50nf. A second cascaded stage is also provided so that it operates at lower gain and has a matching high frequency roll off. Stability is analysed by inspecting the output impedance of the closed loop amplifier instead of the traditional open loop gain.

An op amp is meant to be used in conjunction with an external network connected in such a way as to provide negative feedback as a signal propagates around the feedback loop first through the op amp and then back through the feedback network it experiences a series of delays which tend to jeopardize. A frequency compensation technique for mos audio power amplifiers is presented that allows the frequency compensation capacitors around the power transistors to be smaller than the circuit parasitics without power or stability penalty. The major challenge is to improve the stability of an op amp in a wide bandwidth of applications. Learn about op amp frequency compensation with an example circuit we ll observe in pspice.