An All-Digital RF Signal Generator Using High-Speed $DeltaSigma$ Modulators
Frappe, A.
Flament, A.
Stefanelli, B.
Kaiser, A.
Cathelin, A.
Berkeley Wireless Res. Center, Univ. of California at Berkeley, Berkeley, CA, USA;
This paper appears in: Solid-State Circuits, IEEE Journal of
Publication Date: Oct. 2009
Volume: 44,
Issue: 10
On page(s): 2722-2732
ISSN: 0018-9200
INSPEC Accession Number: 10880535
Digital Object Identifier: 10.1109/JSSC.2009.2028406
Current Version Published: 2009-09-22
Abstract
An all-digital RF signal generator using DeltaSigma modulation and targeted at transmitters for mobile communication terminals has been implemented in 90 nm CMOS. Techniques such as redundant logic and non-exact quantization allow operation at up to 4 GHz sample rate, providing a 50 MHz bandwidth at a 1 GHz center frequency. The peak output power into a 100 Omega diff. load is 3.1 dBm with 53.6 dB SNDR. By adjusting the sample rate, carriers from 50 MHz to 1 GHz can be synthesized. RF signals up to 3 GHz can be synthesized when using the first image band. As an example, UMTS standard can be addressed by using a 2.6 GHz clock frequency. The measured ACPR is then 44 dB for a 5 MHz WCDMA channel at 1.95 GHz with output power of -16 dBm and 3.4% EVM. At 4 GHz clock frequency the total power consumption is 120 mW (49 mW for DeltaSigma modulator core) on a 1 V supply voltage, total die area is 3.2 mm2 (0.15 mm2 for the active area).
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