Abstract :
This paper describes the design and test of a high-speed monolithic track-and-hold circuit (T/H) consisting of a Josephson-junction-bridge current switch and a superconducting storage inductor. The bridge, under the control of a common-mode clock current, switches a balanced, differential input current. The T/H was fabricated using a 5-/spl mu/m, 1000 A/cm/sup 2/ niobium trilayer process. Calculations and simulations of the T/H predict 5-bit dynamic range, 4.6-bit effective dc resolution, 750 MHz analog bandwidth, 725 ps acquisition time, 700 MS/s peak sampling rate, and an unlimited hold time. Measurements on the fabricated T/H verify the proper qualitative behavior of the T/H and show that it has 5-bit dynamic range, 4.5-bit effective dc resolution, 900 MHz analog bandwidth, and a 550 ps acquisition time, commensurate with a 900 MS/s sampling rate.<>
Keywords :
bridge circuits; sample and hold circuits; superconducting integrated circuits; superconducting switches; 550 ps; 900 MHz; DC resolution; Josephson-junction-bridge current switch; Nb; acquisition time; analog bandwidth; common-mode clock current; dynamic range; high-speed monolithic track-and-hold circuit; niobium trilayer process; sampling rate; superconducting storage inductor; Bandwidth; Bridge circuits; Circuit testing; Clocks; Dynamic range; Inductors; Niobium; Sampling methods; Switches; Switching circuits;
