HF mixing stage in the form of a common-base circuit

HF mixing stage in the form of a common-base circuit comprising:

• a) two bipolar amplifying transistors,
• b) two switching stages each associated with a respective amplifying transistor, each having two emitter-coupled bipolar switching transistors and each having a respective signal source which supplies the bases of the switching transistors of the respective switching stage with superimposed signals,
• c) two respective nodes at which the emitters of the switching transistors of a respective switching stage are connected together and to the collector of the associated amplifying transistor,
• d) two further respective output nodes at which the collectors of each of two switching transistors in different ones of said two switching stages are connected together,
• e) circuit elements for electrical isolation connecting the emitters of the amplifying transistors together,
• f) an input signal source with an associated internal resistor and having one terminal connected via circuit input to the circuit elements for electrical isolation and a second terminal connected to a reference potential, said input signal source supplying a signal which is to be transposed into another frequency range through the HF mixing stage;
• and
• wherein:
• g) the two bipolar amplifying transistors are of different conduction type and are each connected in a common-base circuit configuration,
• h) the two switching transistors of each respective switching stage are of the same conduction type as the associated one of said two bipolar amplifying transistors.