Title :
A high-speed fully differential current switch
Author :
Luh, Louis ; Choma, John, Jr. ; Draper, Jeffrey
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
A high-speed fully differential current switch is presented. The clock-feedthrough effect is reduced by Swing-Reduced Drivers (SRDs) and neutralized by dummy transistors. With the use of SRDs, less charges are required to be transferred to/from the gates of the switching transistors, and hence, the switching speed can be increased without significant output error. The SRDs also reduce the possible large current spikes on the outputs of the current switch. Analysis shows this current switch is ideal for high-speed current-mode signal processing. A continuous-time switched-current ΣΔ modulator using these current switches has been implemented in a 2 μm CMOS process and achieved a 50 dB dynamic range with a 50 MHz clock
Keywords :
CMOS analogue integrated circuits; analogue processing circuits; current-mode circuits; driver circuits; field effect transistor switches; modulators; sigma-delta modulation; signal processing; switched current circuits; 1 MHz; 1.75 to 5 V; 2 micron; 20 to 100 MHz; 50 MHz; CMOS process; clock-feedthrough effect; continuous-time ΣΔ modulator; current spikes reduction; dummy transistors; fully differential current switch; high-speed current switch; high-speed current-mode signal processing; sigma-delta modulator; swing-reduced drivers; switched-current ΣΔ modulator; switching speed; switching transistors; CMOS process; Clocks; Driver circuits; MOSFETs; Mirrors; Signal processing; Switches; Switching circuits; Variable structure systems; Voltage;
Conference_Titel :
Electronics, Circuits and Systems, 1998 IEEE International Conference on
Conference_Location :
Lisboa
Print_ISBN :
0-7803-5008-1
DOI :
10.1109/ICECS.1998.814005
