High-power waveform generator

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings wherein like reference numerals refer to like elements throughout, FIGS.
1 and 2 illustrate the inventive concept set forth in the above cross-referenced related application U.
S.
Ser.
No.
08/861,732.
As shown in FIG.
1, reference 10 denotes a stored waveform generator consisting of a digital memory for example, a random access memory (RAM) wherein there is stored one or more signal frequencies e.
g.
a chirp frequency spectrum and which is included in the digital data stream 12 outputting therefrom as shown in FIG.
2.
The stored waveform generator 10 is clocked by the signal generated by a low phase-noise stabilized local oscillator (STALO) 14.
The STALO 14 comprises a cryogenically cooled dielectric (sapphire) resonator which outputs a low phase-noise RF signal 16 having a fixed frequency of 10 GHz.
The stored waveform generator 10 generates and outputs a digital data stream representative of analog signals in the frequency range of 10 MHz.
Further as shown in FIG.
1, the digital data stream 12 is fed to a high speed digital logic gate 18 which is used to drive a Josephson junction array 20 with the digital data stream 12.
The amplitude of the binary ONE values of the digital data stream excite the Josephson junctions in the array 20 so as to generate and output a corresponding digital data stream 22 (FIG.
2) wherein each and every binary digital ONE pulse has an identical quantum mechanically precise amplitude.
The output data stream 22 of the Josephson junction array 20 is then fed to a low pass filter 24 which operates to retrieve in analog form the waveform(s) outputted from the waveform generator 10.
Accordingly, a low phase-noise analog waveform signal shown by reference 26 in FIG.
2 is outputted from the filter 24 when it is then fed to a mixer 28 along with the fixed frequency (10 GHz) output signal 16 of the STALO 14.
The digital data stream 12 represents both linear and non-linear FM chirp signals.
Thus, the output of the mixer 28 comprises a chirp RF signal in the range, for example, 10