Title :
A 10.24GSPS photonic sampled bandpass /spl Delta//spl Sigma/ modulator direct-sampling at 12GHz
Author :
Luh, Louis ; Ng, Willie ; Jensen, Joseph F. ; Le, Duc ; Persechini, David ; Thomas, Steve ; Fields, Charles ; Lin, James
Author_Institution :
HRL Labs. LLC, Malibu, CA
Abstract :
A 10.24GSPS photonic sampled DeltaSigma modulator was implemented with HRL laboratories InP HBT process. The 12GHz analog input is sampled by a LiNbO3 optical modulator with a 10.24GHz ultra-low jitter mode-locked laser. The intensity-modulated differential laser pulses are converted into electronic charges by on-chip GaInAs photo diodes and directly integrated into the first stage integrator of a 4th-order continuous-time bandpass DeltaSigma modulator with a passband centered at 1.8GHz. The high notch frequencies of the DeltaSigma ADC are achieved by using a special type of integrator. This ADC achieves 59.9dB SNDR in 1MH bandwidth with 1263 InP HBT transistors
Keywords :
III-V semiconductors; bipolar integrated circuits; delta-sigma modulation; fibre lasers; gallium compounds; indium compounds; laser mode locking; lithium compounds; microwave photonics; optical modulation; photodiodes; 1 MHz; 1.8 GHz; 10.24 GHz; 12 GHz; 4th-order continuous-time bandpass DeltaSigma modulator; GaInAs; HBT process; InP; LiNbO3; direct-sampling; first stage integrator; intensity-modulated differential laser pulse; on chip photo diodes; optical modulator; photonic sampled DeltaSigma modulator; ultra-low jitter mode-locked laser; Delta modulation; Diodes; Heterojunction bipolar transistors; Indium phosphide; Jitter; Laboratories; Laser mode locking; Optical modulation; Optical pulses; Pulse modulation;
Conference_Titel :
Custom Integrated Circuits Conference, 2005. Proceedings of the IEEE 2005
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-9023-7
DOI :
10.1109/CICC.2005.1568686
