| 摘要 |
PURPOSE:To reduce a power supply voltage required to operate each circuit linearly by utilizing a phase shift capacitor so as to separate a DC drive current system of a multiplier circuit and a main oscillator circuit. CONSTITUTION:An AM sound signal S10 obtained at the multiplier circuit 23 is given to the multiplier circuit 23 and the main oscillator circuit 21 via a 90 deg. phase shift capacitor 5 so as to synthesize the signal into a sound carrier signal S7 at the main oscillator circuit 21. Thus, the capacitor 5 acts like a DC current cut element. Then in applying a DC drive current to the multiplier circuit 23 and a differential circuit of the main oscillator circuit 21, each circuit is separated and the current is shared to each. As a result, the power supply voltage required for linear operation of each circuit is reduced. |
