3.矩形波参数 Tm=0.7(R4+R8)C;zn=(R4+R)C TPL =0.7RB. C T=B T=T+1p=0.7(R4+2RB)C 7==nR×RB q T T +tr+2r PH PL B 1717 3.矩形波参数 TPH = 0.7(RA + RB )C TPL = 0.7RB C ; H = (RA + RB )C ; L = RB C T = TPH +TPL = 0.7(RA + 2RB )C A B A B PH PL W PH R R R R T T T T t q + 2 + = + = =