Title :
A 2.5MHz 55dB switched-current bandpass Σ Δ modulator for AM signal conversion
Author :
de la Rosa, J.M. ; Perez-Verdu, Belen ; Medeiro, F. ; Rodriguez-Vazquez, Angel
Author_Institution :
Instituto de Microelectrónica de Sevilla - CNM, Sevilla, Spain
Abstract :
We present a Switched-Current (SI) fourth-order bandpass ΣΔ modulator IC prototype. It uses fully-differential circuits in 0.8µm CMOS technology to obtain a Dynamic Range (DR) larger than 55dB at 2.5MHz center frequency with 30kHz bandwidth - in accordance to the requirements of AM digital receivers. The prototype incorporates a single-ended to fully-differential current-mode buffer for testing purposes. The power consumption of the whole prototype (modulator plus buffer) is 60mW from a 5V supply voltage.
Keywords :
CMOS technology; Circuits; Dynamic range; Feedback; Frequency; MOSFETs; Quantization; Sampling methods; Switches; Transfer functions;
Conference_Titel :
Solid-State Circuits Conference, 1997. ESSCIRC '97. Proceedings of the 23rd European
Conference_Location :
Southampton, UK
