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Design Of Analog Cmos Integrated Circuits

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Detection, Estimation, and Modulation Theory

VLSI Test Principles and Architectures: Design for Testability (Systems on Silicon)

When it comes to integratability, the zero-intermediate frequency (IF) receiver is an alternative for the heterodyne or IF receiver. In recent years, the zero-IF receiver has been introduced in several applications, but its performance cannot be compared to that of the IF receiver yet. This lower performance is closely related to its baseband operation, resulting in filter saturation and distortion, both caused by DC-offsets and self-mixing at the inputs of the mixers. The low-IF receiver has a topology which is closely related to the zero-IF receiver, but it does not operate in the baseband, only near the baseband. The consequences are that, as for the zero-IF receiver, the implementation of a low-IF receiver can be done with a high degree of integration, however, its performance can be better. In this paper, the fundamental principles of the low-IF receiver topology are introduced. Different low-IF receiver topologies are synthesized and fully analyzed in this paper. This is done by applying the complex signal technique-a technique used in digital applications to the study of analog receiver front ends.

Low-IF topologies for high-performance analog front ends of fully integrated receivers

Direct-conversion microwave Doppler radar can be used to detect cardiopulmonary activity at a distance. One challenge for such detection in single channel receivers is demodulation sensitivity to target position, which can be overcome by using a quadrature receiver. This paper presents a mathematical analysis and experimental results demonstrating the effectiveness of arctangent demodulation in quadrature receivers. A particular challenge in this technique is the presence of dc offset resulting from receiver imperfections and clutter reflections, in addition to dc information related to target position and associated phase. These dc components can be large compared to the ac motion-related signal, and thus, cannot simply be included in digitization without adversely affecting resolution. Presented here is a method for calibrating the dc offset while preserving the dc information and capturing the motion-related signal with maximum resolution. Experimental results demonstrate that arctangent demodulation with dc offset compensation results in a significant improvement in heart rate measurement accuracy over quadrature channel selection, with a standard deviation of less than 1 beat/min

Arctangent Demodulation With DC Offset Compensation in Quadrature Doppler Radar Receiver Systems

Current and future integrated systems demand cost-effective test solutions. In response to that need, this work presents a very compact mixed-signal test system. It performs the characterization of the magnitude and phase responses over frequency at multiple nodes of an analog circuit. The control inputs and output of this system are digital, enabling the test of the analog components in a system-on-chip (SoC) or system-in-package (SiP) through a low-cost digital automatic test equipment. Robust and area-efficient building blocks are proposed for the implementation of the test system, including a linearized analog multiplier for accurate magnitude and phase detection, a wide tuning range voltage-controlled oscillator and a low-power algorithmic analog-to-digital converter. Their individual design considerations and performance results are presented. A complete prototype in TSMC CMOS 0.35-mum technology employs only 0.3mm2 of area. The operation of this test system is demonstrated by performing frequency response characterizations up to 130 MHz at various nodes of two different fourth-order continuous-time filters integrated in the same chip

An Integrated Frequency Response Characterization System With a Digital Interface for Analog Testing

This book describes several techniques to address variation-related design challenges for analog blocks in mixed-signal systems-on-chip. The methods presented are results from recent research works involving receiver front-end circuits, baseband filter linearization, and data conversion. These circuit-level techniques are described, with their relationships to emerging system-level calibration approaches, to tune the performances of analog circuits with digital assistance or control. Coverage also includes a strategy to utilize on-chip temperature sensors to measure the signal power and linearity characteristics of analog/RF circuits, as demonstrated by test chip measurements. Describes a variety of variation-tolerant analog circuit design examples, including from RF front-ends, high-performance ADCs and baseband filters;Includes built-in testing techniques, linked to current industrial trends;Balances digitally-assisted performance tuning with analog performance tuning and mismatch reduction approaches;Describes theoretical concepts as well as experimental results for test chips designed with variation-aware techniques.

Analog Circuit Design for Process Variation-Resilient Systems-on-a-Chip

A Bang-Bang Clock and Data Recovery (CDR) with adaptive loop gain strategy is presented. The proposed strategy enhances CDR jitter performance even if jitter spectrum information is limited a priori. By exploiting the inherent hard-nonlinearity of Bang-Bang Phase Detector (BBPD), the CDR loop gain is adaptively adjusted based on a posteriori jitter spectrum estimation. Maximizing advantages of analog and digital implementations, the proposed mixed-mode technique achieves PVT insensitive and power efficient loop gain adaptation for high speed applications even in limited ft technologies. A modified CML D-latch improves CDR input sensitivity and BBPD performance. A folded-cascode- based Charge Pump (CP) is proposed to minimize CP latency. The 5 G/10 G CDR prototype is fabricated in 0.18 μm CMOS technology to demonstrate the effectiveness of the proposed techniques for applications with high ratio of data-rate to ft. The proposed CDR recovers data with BER <; 2·10-13 and generates only 1.04 ps RMS and 7.5 ps peak-peak jitter. Jitter Tolerance (JTOL) test shows that the proposed CDR enhances low frequency jitter tracking and high frequency jitter filtering simultaneously for various jitter profiles. The CDR power consumption is 110.6 mW where only 3.9 mW is used for loop gain adaptation circuitry.

A Bang-Bang Clock and Data Recovery Using Mixed Mode Adaptive Loop Gain Strategy

A linearisation methodology for broadband low noise amplifiers (LNAs) is considered. The proposed scheme is composed of the main transistor operating in strong inversion healed by a couple of auxiliary transistors operating in triode and subthreshold regions. The nonlinearities of these transistors graciously and efficiently compensate each other, improving main transistor linearity by over 10 dB over all corners for input signals as large as −14 dBm. Power consumption increases by 6% while frequency response and input impedance are almost not affected because the compensating circuits are quite small compared with the main device. Simulation results show that the compensated LNA implemented in Jazz-Semiconductor 0.18 µm CMOS technology has a gain of 11.3 dB, IIP3=18.4 dBm, BW=3.6 GHz while drawing 7.4 mA from a 2.4 V supply voltage.

Robust derivative superposition method for linearising broadband LNAs

This paper deals with the design of very low frequency continuous time filters based on Operational Transconductance Amplifiers (OTAs). Design techniques for both high-performance OTAs and large capacitors are presented. Very small transconductance OTAs with low noise levels and small harmonic distortion components are discussed. Large capacitors are implemented by using impedance scalers based on current mirrors. Design strategies and simulated results for a sixth order 1 Hz lowpass filter are presented.

Jose Silva-Martinez

Papers

An Integrated Frequency Response Characterization System With a Digital Interface for Analog Testing

Analog Circuit Design for Process Variation-Resilient Systems-on-a-Chip

A Bang-Bang Clock and Data Recovery Using Mixed Mode Adaptive Loop Gain Strategy

Robust derivative superposition method for linearising broadband LNAs

Design considerations for high performance very low frequency filters