| 摘要 |
PURPOSE:To decrease greatly the numbe of component elements of a multiplier by controlling the level of the circuit current within the multiplier from outside and controlling the amplitude itself of the multiplication output. CONSTITUTION:The input signal supplied from a terminal 1 is applied to the bases of transistors TR9 and 12 which form the 1st and 2nd differential transistor pairs. While the signal passed through a phase unit 2 is applied to the base of a TR7 forming the 3rd differential transistor pair. These two signals are multiplied by three differential transistor pairs. The TR13 has its base connected to a variable resistor 24 and therefore applies the current accordant with the base voltage to the 3rd differential transistor pairs 7 and 8. Thus the amplitude of the multiplication output can be controlled through the control given to the base voltage of the TR13 by the resistor 24. Thus the use of attenuator is omitted to decrease greatly the number of component elements. |
