DESCRIPTION
is made only on the single channel.) l. Voltage Gain Adjustment Amp2 OUT Amp3,Amp4~20dB OUT Ampl:Pre-Amp Amp2:Phase Amp Amp3:Power Amp(Flat-Amp) Amp4:Power Amp(Flat-Amp) Fig.l Since Lhe inpuL offseL is prevenLed by Pre- Amp Vcc is seL Lo ON, Lhis circuiL can remarkably reduce Lhe pop noise. The LoLal closed loop gain Cv of Lhis IC can be obLained by expression below when Lhe closed loop volLage gain of Amp I is Cv1. G V1 = 20]og RI +Rr(R+rR+2R2) (dB) .................. 0) The closed loop volLage gain of POWER Amp (Amp 3 and 4) is fixed aL Therefore, Lhe LoLal closed circuiL volLage gain Cv is obLained Lhrough HTL connecLion by Lhe expression below. CV=C V1 +Cv3+{)(dH) .................. (2) Por example, when Rf=O Q, Cv is obLained by Lhe expression (1) and (2) as shown below. Cv~ 241201 {)I =50dH 1994. 10. 20 Revision No : 0 KEC 4/11 KIA6210AH The volLage gain is reduced when Rf is increased. (Pig.2) WiLh Lhe volLage gain reduced, since (1) lhe oscillaLion sLabiliLY is redu...
KEC
