A 57--65GHz re-configurable CMOS mQAM transmitter and transformer-coupled power amplifier based on a digitally controlled artificial dielectric. Timothy Richard LaRocca

ISBN: 9781109236897

Published:

NOOKstudy eTextbook

116 pages


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A 57--65GHz re-configurable CMOS mQAM transmitter and transformer-coupled power amplifier based on a digitally controlled artificial dielectric.  by  Timothy Richard LaRocca

A 57--65GHz re-configurable CMOS mQAM transmitter and transformer-coupled power amplifier based on a digitally controlled artificial dielectric. by Timothy Richard LaRocca
| NOOKstudy eTextbook | PDF, EPUB, FB2, DjVu, talking book, mp3, ZIP | 116 pages | ISBN: 9781109236897 | 9.35 Mb

A 57-65GHz, re-configurable CMOS mQAM (quadrature amplitude modulation) transmitter and a power amplifier are presented. Proposed 60GHz wireless standards such as ECMA and IEEE 802.15.3c require flexible systems to handle multiple modulation schemesMoreA 57-65GHz, re-configurable CMOS mQAM (quadrature amplitude modulation) transmitter and a power amplifier are presented. Proposed 60GHz wireless standards such as ECMA and IEEE 802.15.3c require flexible systems to handle multiple modulation schemes such as pi/2-BPSK, pi/2-QPSK, pi/2-Star 8QAM, and pi/2-16QAM to encompass uncompressed audio and video, and file data transfer at data rates beyond 3Gbps up to 10m distances.

Success is dependent on developing a low-cost 60GHz chip set based on a standard digital deep sub-micron CMOS process, while minimizing process variation effects on the desired performance at millimeter-wave frequencies.-The digitally controlled artificial dielectric (DiCAD) addresses both design flexibility and the process sensitivity to achieve a new on-chip re-configurable concept. The DiCAD concept is to digitally control the effective dielectric constant of a differential mode transmission line, DTL.

It uses NMOS switches and floating metal strips to dynamically control the phase. This achieves 35% of the physically available tuning range with effective dielectric constants varying between 18.8 and 32.5.-DiCAD fines are designed to perform a fast linear phase shift of over 100° with thermometer-coded 16 step control. This phase shifter operates with a 16 gain-step VGA to enable direct-frequency modulation at 60GHz with 2562 states (1° resolution) and -31dB static EVM for multiple mPSK/QAM modulations. The modulator uses 0.33mm2 core area in 90nm CMOS and 10mA at1V.-A single, open-stub DiCAD is used to digitally tune a 58-64GHz DCO.

Large nonlinear varactors are avoided. The phase noise is better than -90dBc/Hz at 1MHz offset, linear tuning bandwidth is 9.3% with a 61GHz center frequency. The DCO occupies 0.01mm2, and power consumption is 8.52mW at 1.2V.-Differential and transformer-coupled power and variable-gain amplifiers are also presented. On-chip transformers combine bias, stability and input/interstage matching networks to enable compact designs.

DTLs with fixed artificial dielectric strips provide substrate shielding and size reduction. The three-stage PA obtains small-signal gains exceeding 15dB with saturated output power over 12dBm and associated peak power-added efficiency (PAE) over 20% (14% typical). It occupies an area of 0.15mm2 and consumes 70mA at 1.2V. The VGA provides a peak gain of 25dB with 8dB of variation.



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