50W Thick Film Power Amplifier Circuit Composed of STK084G

Published:2011/7/8 0:38:00 Author:Joyce | Keyword: 50W, Thick Film, Power Amplifier | From:SeekIC

Figure (a) is a 50 W output power amplifier circuit composed of STK084G thick film power amplifier. STK084G is a thick-film integrated chip whose distortion rate is 0.01% in 20 kHz, 50 W. Its internal equivalent circuit is as shown in figure (b) .The input stage is a current mirror circuit composed of VT4 and VT5, which will transform the differential motion output to single-ended output to get a larger gain. VT8 uses ground connection to reduce the influence of Miller effect on its high frequency characteristics. VT1 and VT6 are constant current offset circuits,and they can restrain the influence of power change on the circuit. VT7 is used to output transistor offset.



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