Title :
A digitally-corrected 20b delta-sigma modulator
Author :
Thompson, C.D. ; Bernadas, S.R.
Author_Institution :
Crystal Semicond. Corp., Austin, TX, USA
Abstract :
Transducers such as photodiodes produce signal currents in the 1 pA to 1 /spl mu/A range. To achieve a six-decade dynamic range, thermal noise currents at the system input must be minimized. The authors show that including the transimpedance photodiode amplifier in a delta-sigma modulated loop with digitally-corrected trilevel quantizers/DACs leads to lower thermal noise. The characteristics of the modulator are summarized.<>
Keywords :
analogue-digital conversion; delta modulation; digital-analogue conversion; electron device noise; photodiodes; thermal noise; 1 pA to 1 muA; delta-sigma modulated loop; digitally-corrected trilevel quantizers/DACs; photodiodes; signal currents; thermal noise; transducers; transimpedance photodiode amplifier; Delta modulation; Digital modulation; Filters; Negative feedback; Noise reduction; Passband; Quantization; Resistors; Semiconductor device noise; Thermal resistance;
Conference_Titel :
Solid-State Circuits Conference, 1994. Digest of Technical Papers. 41st ISSCC., 1994 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-1844-7
DOI :
10.1109/ISSCC.1994.344673
