‘Frequency synthesizer’‘electronic assemblies’ having a ‘frequency switching time’ as specified by any of the following: (a) Less than 143 ps; (b) Less than 100 μs for any frequency change exceeding 2,2 GHz within the synthesized frequency range exceeding 4,8 GHz but not exceeding 31,8 GHz; (c) Less than 500 μs for any frequency change exceeding 550 MHz within the synthesized frequency range exceeding 31,8 GHz but not exceeding 37 GHz; (d) Less than 100 μs for any frequency change exceeding 2,2 GHz within the synthesized frequency range exceeding 37 GHz but not exceeding 90 GHz; or (e) Less than 1 ms within the synthesized frequency range exceeding 90 GHz;