HiFi Rose RA180 Integrated Amplifier CoolGaN
CoolGaN
Inside the RA180 are four identical, custom Class D amplifier modules, each equipped with a pair of IGO60R070D1 CoolGaN enhancement-mode power transistors from Infineon Technologies [top right in inset PCB picture]. The faster switching speed, lower on resistance and excellent thermal stability of these devices gives them a performance advantage over silicon transistors in this analogue PWM circuit.
However, the circuit architecture is otherwise similar to conventional Class D amplifiers where the inductive output filter network imposes some sensitivity to the speaker load on the final amplifier/system frequency response. PM
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