Patent ID: 6114921
Filing Date: 2000-09-05
Classification: H03C,H03D

Abstract:
A double-balanced modulator comprising:a first and a second input terminal;a pair of preamplifiers comprising a first and a second transistor, in which each of the first and the second transistors are interconnected with one of the input terminals, respectively, through at least one capacitor interconnected in series with at least one first resistor;a double balanced differential amplifier comprising a third and a fourth transistor, in which each of the third and the fourth transistors has a base and an emitter, in which the emitters of the third and the fourth transistors are interconnected to a collector of the first transistor;said double balanced differential amplifier further comprising a fifth and a sixth transistor, in which each of the fifth and the sixth transistors has a base and an emitter, in which the emitters of the fifth and a sixth transistors are interconnected to a collector of the second transistor; andwherein the bases of the third and sixth transistors and the bases of the fourth and fifth transistors, respectively, are interconnected to receive at least one balance carrier signal, and wherein each of said preamplifiers are interconnected to a single power source through at least one second resistor.