80-MHz bandpass ΔΣ modulators for multimode digital IF receivers.

Three fully differential bandpass (BP) ΔΣ modulators are presented. Two double-delay resonators are implemented using only one operational amplifier. The prototype circuits operate at a sampling frequency of 80 MHz. The BP ΔΣ modulators can be used in an intermediate-frequency (IF) receiver to combi...

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Bibliographic Details
Published in:	IEEE Journal of solid state circuits 38, 3 (2003).
Main Author:	Salo, T.O
Format:	Article
Language:	English
Subjects:	0.35 micron. 1.25 MHz. 1.762 MHz. 24 to 38 mW. 270 kHz. 3.0 V. 3.84 MHz. 60 to 20 MHz. 80 MHz. CMOS technology. DECT. GSM. IS-95. WCDMA/CDMA2000. Analog-to-digital conversion. Clock jitter. Direct input signal sampling. Double-delay resonators. Eighth-order loop filter. Frequency downconversion. Intermediate-frequency receiver. Multimode digital IF receivers. Operational amplifier. Peak signal-to-noise-plus-distortion ratios. Sampled data circuits. Sampling frequency. Subsampling. Switched-capacitor resonators. Fully differential bandpass ΔΣ modulators.