A 6-GHz Low-Power BiCMOS SiGe:C 0.25 $\mu$ m Direct Digital Synthesizer

A 6-GHz low power SiGe direct digital synthesizer (DDS) is reported. This letter discusses the BiCMOS design improvements used for the phase accumulator and the phase-to-amplitude conversion in order to achieve higher speed operation and lower power consumption compared to existing DDS. The phase accumulator is based on a three-level BiCMOS logic, and the phase-to-amplitude conversion is completed through a bipolar differential pair. The circuit has been processed in a BiCMOS SiGe:C 0.25 mum technology. The power consumption is 308 mW and it operates from a 2.8 V supply. The chip core area is 1 mm2.

[1]  S.E. Turner,et al.  Direct digital synthesizer with ROM-Less architecture at 13-GHz clock frequency in InP DHBT technology , 2006, IEEE Microwave and Wireless Components Letters.

[2]  Foster F. Dai,et al.  2 GHz 8-bit CMOS ROM-less direct digital frequency synthesizer , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[3]  S.E. Turner,et al.  4-bit adder-accumulator at 41-GHz clock frequency in InP DHBT technology , 2005, IEEE Microwave and Wireless Components Letters.

[4]  R. Krebs,et al.  Merged CMOS/bipolar current switch logic (MCSL) , 1989 .

[5]  E. Tournier,et al.  A DDS-oriented phase-to-amplitude converter using a SiGe:C bipolar transistors differential pair , 2005, 2005 IEEE International Wkshp on Radio-Frequency Integration Technology: Integrated Circuits for Wideband Comm & Wireless Sensor Networks.

[6]  A. Gutierrez-Aitken,et al.  Ultra high speed direct digital synthesizer using InP DHBT technology , 2001, GaAs IC Symposium. IEEE Gallium Arsenide Integrated Circuit Symposium. 23rd Annual Technical Digest 2001 (Cat. No.01CH37191).

[7]  Venceslav F. Kroupa.  A Digital Frequency Synthesizer , 1999 .

[8]  Mark J. W. Rodwell,et al.  2-bit adder: carry and sum logic circuits at 19 GHz clock frequency in InAlAs/InGaAs HBT technology , 2001 .

[9]  R.C. Jaeger,et al.  A low power 5 GHz direct digital synthesizer designed in SiGe technology , 2004, Digest of Papers. 2004 Topical Meeting onSilicon Monolithic Integrated Circuits in RF Systems, 2004..

[10]  Willy Sansen,et al.  The differential pair as a triangle-sine wave converter , 1976 .

[11]  P. H. Saul,et al.  A high-speed direct frequency synthesizer , 1990 .