SESSION FP14

SALON 8

ANALOG TECHNIQUES

Chair: P. Brokaw, Analog Devices, Wilmington, MA
Associate Chair: H. Lee, MIT, Cambridge, MA

14.1 - A 10b 250MSample/s CMOS DAC in 1mm² - 1:30 PM

C-H. Lin^1-2, K. Bult¹

¹Broadcom Corporation, Irvine, CA

²UCLA, Los Angeles, CA

A current-domain CMOS DAC is optimized for frequency-domain applications. SFDR is 68dB at 20MHz output signal, and close to Nyquist, at 120MHz, SFDR is 57dB. This DAC is intended for embedded applications, with large digital circuitry.

14.2 - A 12b Accuracy 300MSample/s Update Rate CMOS DAC - 2:00 PM

A. Marques, J. Bastos, A. Van den Bosch, J. Vandenbussche, M. Steyaert, W. Sansen

Katholieke Universiteit Leuven, Heverlee, Belgium

A 12b 300MHz DAC integrated in standard digital 0.5um CMOS is based on a current-steering segmented 6+2+4 architecture and requires no tuning or trimming. The INL is 0.6LSB. The glitch is 1.9pV¸s. The 3.2mm² DAC consumes 320mW, and operates from a single 3.3V supply.

14.3 - A Practical Quality Factor Tuning Scheme for IF and High-Q Continuous-Time Filters - 2:30 PM

J-M. Stevenson, E. Sßnchez-Sinencio

Texas A&M University, College Station, TX

A quality factor (Q) tuning technique for high-frequency and high-Q continuous-time filter biquads is based on magnitude locked loop Q-tuning and the continuous-time adaptive LMS algorithm. A test chip consisting of a 4th-order bandpass filter at 10.7MHz with biquad Q of 20 in 1.2um CMOS has <1% measured Q-tuning error.

BREAK 3:00 PM

14.4 - A 2.7V 200kHz 49dBm-IIP3 Low-Noise Fully-Balanced Gm-C Filter IC - 3:15 PM

T. Itakura, T. Ueno, H. Tanimoto, A. Yasuda, R. Fujimoto, T. Arai, H. Kokatsu

Toshiba Corp., Saiwai-ku, Japan

A 2.7V low-distortion low-noise gm-C filter adopts real resistors for terminations. It consumes 11.5mA/ch. It achieves 49dBm stopband IIP3, 14dBm passband IIP3, and 28nV/[square root]Hz input-referred noise. It operates at 2.2V with 40dBm stopband IIP3. The cut-off frequency is tuned to 200kHz using a reference resistor.

14.5 - A 20-800MHz Relaxation Oscillator with Automatic Swing Control - 3:45 PM

T. Sowlati, H. Shakiba

Gennum Corp., Burlington, Ontario, Canada

Automatic swing control feedback is applied to a VCO. The ASC feedback increases linear frequency range and reduces sensitivity to process and temperature. ASC-VCO in 14GHz-fT bipolar operates from 20MHz to 800MHz, whereas VCO without ASC feedback, to only 500MHz.

14.6 - A Fully Integrated VCO at 2GHz - 4:15 PM

M. Zannoth¹, B. Kolb¹, J. Fenk¹, R. Weigel²

¹Siemens AG, Muenchen, Germany

²University Linz, Inst. for Communications and Information Eng., Austria

A 2GHz VCO has -13dBc/Hz phase noise at 4.7MHz frequency offset. The LC-resonator uses vertically-coupled on-chip inductors and integrated tuning diodes, in 25GHz-fT standard bipolar.

14.7 - A Fully Integrated 2.7V 0.35um CMOS VCO for 5GHz Wireless Applications - 4:30 PM

P. Kinget

Bell Labs., Lucent Technologies, Murry Hill, NJ

A 4.7GHz balanced VCO with fully-integrated tank in standard digital 0.35um CMOS operates from 2.7V and draws 4mA. SSB phase noise is -90dBc/Hz at 100kHz and -110dBc/Hz at 1MHz offset. Tuning range is 200MHz or 4.3%. Using parasitics of large devices as tank capacitors, this performance is obtained with inductor Q of 3.

CONCLUSION 4:45 PM

Go back to Table of Contents