1. A high frequency clock generator comprising: a plurality of clock oscillator circuits, each of said clock oscillator circuits including an output terminal for transmitting an output clock signal from the clock oscillator circuit; a first multiplexer comprising a plurality of input terminals coupled on a one-to-one basis to the plurality of output terminals of said plurality of clock oscillator circuits, said first multiplexer also comprising an output terminal providing an output clock signal at a first predetermined oscillation frequency; and a second multiplexer comprising a plurality of input terminals coupled on a one-to-one basis to the output terminals of said plurality of clock oscillator circuits, said second multiplexer also comprising an output terminal providing a second predetermined oscillation frequency, wherein said plurality of clock oscillator circuits and said first multiplexer and said second multiplexer are formed as an integrated circuit.