Unbalanced-to-balanced signal converter circuit

Details Unbalanced-to-balanced signal converter circuit Unbalanced-to-balanced signal converter circuit

1977-05-31

1978-08-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330288, 330301, 333 80T, H03F 345, H03F 304, H03G 300

Patent

active

041092147

ABSTRACT:
The disclosed unbalanced-to-balanced signal converter circuit includes two pairs of transistors, each pair having first and second transistors with the base-to-emitter junctions of each pair being connected in series between a reference potential point and a constant current source. A driver circuit is arranged to supply an unbalanced input signal which increases the conductivities of the first transistor of the first pair and the second transistor of the second pair, while decreasing the conductivities of the second transistor of the first pair and the first transistor of the second pair, and vice versa. Balanced linear output signals are provided at the collectors of the second pair of transistors. A gain controlled amplifier and a capacitance control circuit each including the unbalanced-to-balanced converter are also disclosed.

REFERENCES:
patent: 3560866 (1971-02-01), Haines
patent: 3573645 (1971-04-01), Wheatley
patent: 4039981 (1977-08-01), Ohashi

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