| 摘要 |
<p>PURPOSE:To attain circuit integration by providing an amplifier circuit whose signal is fed back to lines A, B corresponding to the lines A, B. CONSTITUTION:Since resistors RA1, RB1 have identical high resistance value, only an in-phase signal appears at the connecting point N in both the lines A, B. Since an output v0 of an operational amplifier OAA is a difference of output between that based on a non-inverting input and that based on an inverting input, when the output v0 is zero, the impedance to the in-phase component viewed from the line A is only the resistor RA7. Since the termination impedance is constant, the resistance RA7 is multiplied by (n) to a differential signal due to the non-inverting feedback from the impedance ZA2, giving an impedance of 600 or 900OMEGA. Since the DC component is shut by capacitors CA1, CA2, the DC feeding resistance is 200OMEGA by selecting the resistors RA2, RA3.</p> |
