# Solid State Circuits, Volume 47, Issue 6

A Push-Push VCO With 13.9-GHz Wide Tuning Range Using Loop-Ground Transmission Line for Full-Band 60-GHz Transceiver
Nakamura, T.; Masuda, T.; Washio, K.; Kondoh, H.

A 59-GHz push-push voltage-controlled oscillator (VCO) is presented.  The VCO uses a loop-ground transmission line (LG-TML), which makes it possible to output both a large signal at second harmonic frequency and an adequate signal at the fundamental frequency for driving a prescalar.  The VCO achieves high output power of +1.5 dBm, while maintaining wide tuning range of 13.9 GHz (26% of the center oscillation frequency).  A new single turn inductor geometry is also presented showing improved performance vs. an octagonal inductor.

Low Phase Noise Wide Tuning Range N-Push Cyclic-Coupled Ring Oscillators
Abdul-Latif, M. M.; Sanchez-Sinencio, E.

Cyclic-coupled ring oscillators (CCRO) provide several unique features over regular ring oscillators such as availability of multiple sets of phase-shifted outputs and reduced phase noise.  This paper presents CCROs fabricated in a 90 nm digital CMOS process.  The oscillators achieve superior phase noise performance as well as competitive figure-of-merit compared with the state-of-the-art ring oscillators.

A Low-Phase-Noise Wide-Tuning-Range Oscillator Based on Resonant Mode Switching
Li, G.; Liu, L.; Tang, Y.; Afshari, E.

This paper presents a low-phase-noise wide-tuning-range oscillator suitable for scaled CMOS processes. The oscillator switches between the two resonant modes of a high-order LC resonator that consists of two identical LC tanks coupled by capacitor and transformer.

A Monolithic 25-Gb/s Transceiver With Photonic Ring Modulators and Ge Detectors in a 130-nm CMOS SOI Process
Buckwalter, J. F.; Zheng, X.; Li, G.; Raj, K.; Krishnamoorthy, A. V.

This paper presents a fully-integrated, silicon photonic transceiver using photonic microring resonator modulators for low power consumption.  The transmitter and receiver is demonstrated to data rates of 25 Gb/s with a BER of $10^{-12}$. The total power consumption of the transceiver is 256 mW and demonstrates a link efficiency of 10.2 pJ/bit excluding laser power. At 25 Gb/s, the driver operates at 7.2 pJ/bit.

A 5-Gb/s Automatic Gain Control Amplifier With Temperature Compensation
Liu, C.; Yan, Y.-P.; Goh, W.-L.; Xiong, Y.-Z.; Zhang, L.-J.; Madihian, M.

This paper presents an automatic gain control (AGC) amplifier with temperature compensation for high-speed applications. The proposed AGC consists of a folded Gilbert variable gain amplifier (VGA), a dc offset canceller, inductorless post amplifiers, a linear open-loop peak detector (PD), an integrator, a symmetrical exponential voltage generator, and a compensation block for temperature stability.

A 10-b 320-MS/s Stage-Gain-Error Self-Calibration Pipeline ADC
Tseng, C.-J.; Chen, H.-W.; Shen, W.-T.; Cheng, W.-C.; Chen, H.-S.

A 10-b 320-MS/s pipeline analog-to-digital converter (ADC) with low dc gain opamps, as low as 30.6 dB based on simulations, in its multiplying digital-to-analog converters (MDACs) is presented. A foreground self-calibration technique is proposed to reduce stage gain error by adjusting feedback factor with a calibration capacitor array. The prototype in 90-nm low-power CMOS technology achieves conversion rate of 320 MS/s with peak SFDR and SNDR of 66.7 and 54.2 dB, respectively.  The technique of compensating for low amplifier gain by adjusting the feedback factor could have broad application to other circuits.

A 100 W 5.1-Channel Digital Class-D Audio Amplifier With Single-Chip Design
Liu, J.-M.; Chien, S.-H.; Kuo, T.-H.

A 100 W, 5.1-channel, single-chip, digital-input class-D audio amplifier with a low-voltage (LV) digital circuit and high-voltage (HV) switching power stage is designed for moderate-performance and cost-effective speaker systems.  Fabricated with 0.35/3-μm 3.3/18-V 1P3M CMOS technology, the 5.1-channel amplifier achieves a total root-mean-square (RMS) output power of 100 W, a distortion of less than 0.7%, and a power efficiency of 88% with a total chip area of 48.9 $mm^{2}$.  This is a really cool design, but whether or not it is cost effective to do the 25 $mm^{2}$ audio processor in 0.35u is questionable.  Also note the crossed bond wires in the right channel output section of Figure 18.

A 0.18u Monolithic Li-Ion Battery Charger for Wireless Devices Based on Partial Current Sensing and Adaptive Reference Voltage
Pagano, R.; Baker, M.; Radke, R. E.

A Li-ion battery charger based on a charge-control buck regulator operating at 2.2 MHz is presented in this paper.  The novelty of the proposed charge-control converter consists of regulating the average output current by only sensing a portion of the inductor current and using an adaptive reference voltage. By adopting this approach, the charger average output current is set to a constant value of 900 mA regardless of the battery voltage variation.

Efficient Energy Harvesting With Electromagnetic Energy Transducers Using Active Low-Voltage Rectification and Maximum Power Point Tracking
Maurath, D.; Becker, P. F.; Spreemann, D.; Manoli, Y.

This paper reports on efficient interfacing of typical vibration-driven electromagnetic transducers for micro energy harvesting. An adaptive charge pump for dynamic maximum power point tracking is compared with a novel active full-wave rectifier design.  The active diode rectifier achieves efficiencies over 90% at a wide range of input voltage amplitudes of 0.48 V up to 3.3 V. The adaptive charge pump can harvest with a total efficiency of close to 50%, but very independent of the actual buffer voltage.  Results of harvesting from an actual electromagnetic generator prototype are presented.

Electronic Temperature Compensation of Lateral Bulk Acoustic Resonator Reference Oscillators Using Enhanced Series Tuning Technique
Lavasani, H. M.; Pan, W.; Harrington, B. P.; Abdolvand, R.; Ayazi, F.

This paper reports on the demonstration of series tuning for lateral micromechanical oscillators and its application for electronic temperature compensation of piezoelectric lateral bulk acoustic resonator (LBAR) micromechanical oscillators.

# Introduction

This blog is a digest of various analog circuit journals, papers, books, and magazines.  The
initial focus will be on the following IEEE journals:

In the future, we will also cover interesting articles in less academic magazines such as EDN or Nuts and Volts.

We will also accept original papers for publication on this blog.  If you’ve got something that you’d like to submit, let us know!