Title :
Superconducting bandpass /spl Delta//spl Sigma/ modulator with 2.23 GHz center frequency and 42.6 GHz sampling rate
Author :
Bulzacchelli, J.F. ; Hae-Seung Lee ; Misewich, J.A. ; Ketchen, M.B.
Author_Institution :
MIT, Cambridge, MA, USA
Abstract :
A superconducting bandpass /spl Delta//spl Sigma/ modulator employing a 2.23 GHz microstrip resonator and a single flux quantum comparator clocked at 42.6 GHz achieves 49 dB peak SNR over a 20.8 MHz bandwidth. At 40.2 GHz clock rate, in-band noise over a 19.6 MHz bandwidth is -57 dBFS. The test chip with integrated acquisition memory contains 4065 Josephson junctions and dissipates 1.9 mW at T=4.2K.
Keywords :
aluminium compounds; band-pass filters; current comparators; delta-sigma modulation; microwave integrated circuits; niobium; superconducting device noise; superconducting integrated circuits; superconductor-insulator-superconductor devices; 19.6 MHz; 2.23 GHz; 2.23 GHz center frequency; 20.8 MHz; 40.2 GHz clock rate; 42.6 GHz; 42.6 GHz sampling rate; GHz range; Josephson junctions; Nb-AlO/sub x/-Nb; Nb/AlO/sub x//Nb technology; SNRs; bandwidth 19.6 MHz; bandwidth 20.8 MHz; dissipation 1.9 mW; microstrip resonator; single flux quantum comparator; superconducting bandpass /spl Delta//spl Sigma/ modulator; test chip; Clocks; Counting circuits; Delta modulation; Frequency; Josephson junctions; Pulse amplifiers; Pulse generation; Pulse modulation; Sampling methods; Shift registers;
Conference_Titel :
Solid-State Circuits Conference, 2002. Digest of Technical Papers. ISSCC. 2002 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-7335-9
DOI :
10.1109/ISSCC.2002.992999
