Soliton-phase analog-to-digital converter

Details Soliton-phase analog-to-digital converter Soliton-phase analog-to-digital converter

1993-05-25

1994-04-19

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341133, 505827, H03M 100

Patent

active

053050061

ABSTRACT:
A superconducting analog-to digital converter comprises an input line, a soliton generator, a phase sampler, and a decoder. The soliton generator includes a nonlinear transmission line and a gradient current source. The transmission line is a series of inductive links separated from a superconducting ground plane by Josephson junction. The gradient current source induces gradient pump currents that are inductively coupled into the transmission line. The gradient establishes a three-cycle soliton. A time-varying current input signal is inductively coupled to the transmission line so that the local pump current changes as a function of changes in the input signal. These changes cause the soliton to move, and thus change its phase, along the transmission line. Sixty-four comparators of the phase sampler track the phase of the soliton. The digital readout of the phase sampler is then decoded to determine the value of the signal input. This configuration provides for 6-7 bits of subquantum resolution so that the ADC is well suited as an interpolator for grosser ADCs.

REFERENCES:
patent: 5078464 (1992-01-01), Islam

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