Integrated circuit for frequency conversion

摘要

A frequency converter circuit suitable for being constructed in the form of an integrated circuit and adapted to the frequency conversion of a carrier chrominance signal for recording and reproducing chrominance video signals basically comprises a full balance type differential amplifier including three sets of paired differential transistors. Two sets of paired differential transistors, in which the collector of one transistor of one paired differential transistors is connected to that of the corresponding one transistor of the other paired differential transistors and the collector of the other transistor of the one paired differential transistors is connected to that of the other transistor of the other paired differential transistors, are provided for the output stage and have those collectors each connected to the respective emitters of grounded base transistors. The grounded base transistors have their collectors each connected to a load resistor. The output signal is picked up from the collector of one of the grounded base transistors.