Frequency conversion device with dual local oscillators and satellite payload comprising such a device

A frequency conversion device, for installation on board of a satellite, comprising an active assembly comprising:

• at least one first radio-frequency processing chain comprising a first mixer,
• a first local oscillator operating at a first frequency and connected to the first mixer,
• at least one second radio-frequency processing chain comprising a second mixer,
• a second local oscillator operating at a second frequency and connected to the second mixer, and
• a current or voltage converter for supplying power to the active assembly,
• the current or voltage converter being connected to the at least one first radio-frequency processing chain, to the at least one second radio-frequency processing chain, to the first local oscillator, and to the second local oscillator, wherein:
• said current or voltage converter, said at least one first radio-frequency processing chain, said first local oscillator, said at least one second radio-frequency processing chain, and said second local oscillator, are grouped together within one and a same first unit, and
• the frequency conversion device comprising at least one additional unit that is identical to the first unit, each additional unit being configured to be either active or inactive and redundant.