What is fixed resistance power amplifier?

by:Gisen     2020-01-04
What is fixed resistance power amplifier? Constant resistance power amplifier usually refers to power amplifier with output impedance below 16 ohms, also known as low resistance power amplifier. Most of them are set above two channels. The final output circuit is mainly OTL and OCL, the output voltage is low, the current is large, and the impedance of the load is required to be low. Characteristics of fixed resistance power amplifier: fixed resistance power amplifier requires constant impedance of the load. When the input signal is constant, the output voltage changes greatly with the load. Since a deep negative feedback device is used in the amplifier, this deep negative feedback amount is generally 10 ~ More than 20dB, therefore, the output impedance of the amplifier is low, and when the load changes within a certain range, the output voltage can still maintain a certain value, and the sound quality can remain unchanged. When the input signal is constant, the output voltage changes greatly with the load. Constant voltage output power amplifier: since a deep negative feedback device is used in the amplifier, this deep negative feedback amount is generally 10 ~ More than 20dB, therefore, the output impedance of the amplifier is low and its output voltage can still maintain a certain value when the load changes within a certain range. Advantages and disadvantages of constant resistance power amplifier: Advantages: constant resistance power amplifier generally uses constant resistance output in order to give full play to the performance of the device. It can give full play to the potential of circuit devices and achieve maximum and best results. Disadvantages: when the connection of the load circuit cannot match the impedance, the equipment may be damaged.
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