| 摘要 |
PURPOSE:To realize a BTL connection in a stable operation by directly connecting the earth electrode with the earth bonding pad, and at the same time, to contrive to miniaturize the title circuit by stacking respectively the exclusive conductive path and the earth conductive path using a multilayer wiring. CONSTITUTION:An earth electrode 18, whereon an input signal to the inversion amplifier is impressed, is directly connected with an earth bonding pad 20 through an exclusive conductive path 19, and an earth conductive path 21 and the exclusive conductive path 19 and respectively stacked using a multilayer wiring. As each earth electrode of the noninversion amplifier and the inversion amplifier is not connected to the exclusive conductive path 19, unnecessary current does not run through the exclusive conductive path 19. Therefore, the fluctuations of the potential due to the resistance, which is caused by forming the exclusive conductive path 19 using an evaporating aluminum, can be nearly removed and the earth electrode 18 of a split resistor 3 can be fixed in nearly the same earth potential as that of the earth bonding path 20. As a result, a ripple component can be prevented from being included in the input signal to the conversion amplifier. |
