Title :
A 4GHz 4th-Order Passive LC Bandpass Delta-Sigma Modulator with IF at 1.4GHz
Author :
Luh, Louis ; Jensen, Joseph F. ; Lin, Cheng-Min ; Tsen, Chan-Tang ; Le, Dustin ; Cosand, Albert E. ; Thomas, Stephen ; Fields, Charles
Author_Institution :
HRL Labs., LLC, Malibu, CA
Abstract :
A 4th-order bandpass DeltaSigma modulator utilizes a novel passive LC continuous-time DeltaSigma architecture to achieve the high IF (pass band) frequency (1.4GHz). A 3-bit quantizer is used to improve wideband performance. A novel architecture of noise-shaped quantizer is used to noise shape the DAC mismatch without introducing extra loop delay. Eight 2nd-order LC modulators are used for noise shaping with minimal transistor count and power consumption. Implemented with 5195 InP HBT transistors, this modulator achieved 76dB SNR and 90dB dynamic range in 1 MHz bandwidth at 1.4GHz with a 4GHz sample rate
Keywords :
band-pass filters; bipolar digital integrated circuits; delta-sigma modulation; microwave integrated circuits; passive networks; quantisation (signal); 1 MHz; 1.4 GHz; 3 bit; 4 GHz; DAC mismatch; HBT transistor; InP; LC modulator; bandpass delta-sigma modulator; noise shaping; noise-shaped quantizer; Delay; Delta modulation; Dynamic range; Energy consumption; Frequency; Heterojunction bipolar transistors; Indium phosphide; Noise shaping; Signal to noise ratio; Wideband;
Conference_Titel :
VLSI Circuits, 2006. Digest of Technical Papers. 2006 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0006-6
DOI :
10.1109/VLSIC.2006.1705363
