# IEEE Transactions on Circuits and Systems II: Express Briefs

## Filter Results

Displaying Results 1 - 20 of 20

Publication Year: 2012, Page(s): C1
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• ### IEEE Transactions on Circuits and Systems—II: Express Briefs publication information

Publication Year: 2012, Page(s): C2
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• ### A Power-Efficient Noise Suppression Technique Using Signal-Nulled Feedback for Low-Noise Wideband Amplifiers

Publication Year: 2012, Page(s):1 - 5
Cited by:  Papers (8)
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The design of wideband amplifiers suffers from an essential tradeoff between noise and power consumption. This brief presents a power-efficient noise-suppression technique that excludes the signal from a noise-suppression loop by nulling the signal swing in transconductance cells. Once the loop is with less concern on signal linearity, the power constraint on the loop gain stage can be greatly rel... View full abstract»

• ### Design Considerations in Tapped-Inductor Fourth-Order Dual-Band VCO

Publication Year: 2012, Page(s):6 - 10
Cited by:  Papers (2)
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A theoretical analysis of the constraints posed by a tapped inductor on a dual-band fourth-order voltage-controlled oscillator (VCO) is presented. The analysis provides guidelines for frequency band selection, tapped-inductor design, and VCO optimization. The guidelines are utilized in a VCO design example simulated on a 45-nm CMOS process. An adaptive frequency-tuning scheme exploits unique featu... View full abstract»

• ### A Darlington-Enhanced CMOS Oscillator Architecture

Publication Year: 2012, Page(s):11 - 15
Cited by:  Papers (2)
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A fully differential CMOS oscillator using Darlington composite pMOS transistors is presented. The composite transistor structure increases gain of the negative-Gm stage for a reliable startup and improves device reliability due to use of high-voltage transistors. To achieve good phase noise available with large voltages and the speed of small active devices in a modern CMOS process, a higher (2.8... View full abstract»

• ### Optimization and Realization of a 315-MHz Low-Phase-Noise Voltage-Controlled SAW Oscillator

Publication Year: 2012, Page(s):16 - 19
Cited by:  Papers (4)
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In this paper, the formulation of QL is derived from the analysis of the Butler common-base surface acoustic wave (SAW) oscillator circuit. The prototype 315-MHz Butler SAW oscillator is designed, and phase-noise results before and after adding voltage-control components are measured. The SAW resonator utilized is R315 with an unloaded quality factor Q0 of about... View full abstract»

• ### Phase Noise Analysis of the Tuned-Input–Tuned-Output (TITO) Oscillator

Publication Year: 2012, Page(s):20 - 24
Cited by:  Papers (8)
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The theoretical phase noise performance of a tuned-input tuned-output (TITO) oscillator is analyzed with a rigorous approach, which yields a compact closed-form phase noise equation that is dependent only on the value of the circuit components and current consumption of the oscillator. A straightforward comparison with the more commonly used differential LC-tank oscillator shows that the latter is... View full abstract»

• ### Quality Factor Analysis for Cross-Coupled $LC$ Oscillators Using a Time-Varying Root Locus

Publication Year: 2012, Page(s):25 - 29
Cited by:  Papers (2)
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An extraction of an effective oscillator Q factor in cross-coupled LC oscillators using time-varying root locus is proposed. The extraction utilizes root computations and analytical expression of the cross-coupled-pair admittance. The methodology permits to investigate the Q-factor degradation mechanisms in large-signal LC oscillators and to compare different oscillator... View full abstract»

• ### Power-Scalable, Complex Bandpass/Low-Pass Filter With I/Q Imbalance Calibration for a Multimode GNSS Receiver

Publication Year: 2012, Page(s):30 - 34
Cited by:  Papers (12)
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A power-scalable reconfigurable filter with in-phase/quadrature (I/Q) imbalance calibration for a multimode Global Navigation Satellite Systems (GNSS) receiver is presented. The filter is reconfigurable as either a fifth-order complex bandpass filter exhibiting a tunable intermediate frequency (4.092, 6.138, 10.23, 12.296, 13.29, 18.4, and 20.442 MHz) and bandwidth (2.2, 4.2, 8, 10, and 18 MHz) or... View full abstract»

• ### A Dual-Feedforward Carrier-Modulated Second-Order Class-D Amplifier With Improved THD

Publication Year: 2012, Page(s):35 - 39
Cited by:  Papers (4)  |  Patents (2)
| | PDF (755 KB) | HTML

The advancement of power MOSFET fabrication technology has aided the reduction of power stage errors in class-D amplifiers (amps). This reduction reveals intrinsic distortion, which is a key performance limiter in modern pulsewidth-modulation (PWM)-based class-D amps. In this brief, a dual-feedforward carrier modulation topology is proposed to reduce the intrinsic harmonic distortion of a second-o... View full abstract»

• ### An Ultrafast Adaptively Biased Capacitorless LDO With Dynamic Charging Control

Publication Year: 2012, Page(s):40 - 44
Cited by:  Papers (40)
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This brief presents a current-efficient fully integrated low-dropout regulator (LDO) for system-on-a-chip applications. A common-gate error amplifier with high bandwidth and slew rate is proposed to reduce the output voltage spike and the response time of the LDO greatly. In addition, the loop employs a direct dynamic charging technique to enhance load-transient responses by directly detecting vol... View full abstract»

• ### A Low-Dropout Regulator With Tail Current Control for DPWM Clock Correction

Publication Year: 2012, Page(s):45 - 49
Cited by:  Papers (19)
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A low-dropout (LDO) regulator with tail current control (TCC) is presented. The TCC consists of a dual differential pair, a 5-bit current digital-to-analog converter, and a current summation circuit. The TCC adjusts the tail current ratio of the dual differential pair of the LDO regulator to achieve a programmable output voltage using 5-bit digital signals. A supply-ripple isolation mechanism is a... View full abstract»

• ### Load-Independent Current Control Technique of a Single-Inductor Multiple-Output Switching DC–DC converter

Publication Year: 2012, Page(s):50 - 54
Cited by:  Papers (15)
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A load-independent current control technique is applied to a single-inductor multiple-output switching dc-dc boost converter implemented in a 0.5-μm standard CMOS technology. The total current is regulated by monitoring the instant of zero inductor current, and no additional power stage and reactive components are required. The output voltage settles within 25 μs with a voltage dip l... View full abstract»

• ### Design of a Subthreshold-Supply Bootstrapped CMOS Inverter Based on an Active Leakage-Current Reduction Technique

Publication Year: 2012, Page(s):55 - 59
Cited by:  Papers (15)
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This brief presents a bootstrapped CMOS inverter operated with a subthreshold power supply. In addition to improving the driving ability, a large gate voltage swing from -VDD to 2VDD suppresses the subthreshold leakage current. As compared with other reported works, the proposed bootstrapped inverter uses fewer transistors operated in the subthreshold region. Th... View full abstract»

• ### Linear Programming Design of Coefficient Decimation FIR Filters

Publication Year: 2012, Page(s):60 - 64
Cited by:  Papers (3)
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The coefficient decimation technique for reconfigurable FIR filters was recently proposed as a filter structure with low computational complexity. In this brief, we propose to design these filters using linear programming taking all configuration modes into account, instead of only considering the initial reconfiguration mode as in previous works. Minimax solutions with significantly lower approxi... View full abstract»

• ### Low-Cost and High-Accuracy Design of Fast Recursive MDCT/MDST/IMDCT/IMDST Algorithms and Their Realization

Publication Year: 2012, Page(s):65 - 69
Cited by:  Papers (4)
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This brief presents a novel low-cost and high-accuracy design for recursive modified discrete cosine transform (MDCT), modified discrete sine transform (MDST), inverse MDCT (IMDCT), and inverse MDST (IMDST) algorithms. The proposed algorithm not only can simultaneously compute MDCT and MDST (or IMDCT and IMDST) coefficients by adopting a compact recursive structure but also can increase the peak s... View full abstract»

Publication Year: 2012, Page(s): 70
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Publication Year: 2012, Page(s):71 - 72
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• ### IEEE Circuits and Systems Society Information

Publication Year: 2012, Page(s): C3
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• ### IEEE Transactions on Circuits and Systems—II: Express Briefs information for authors

Publication Year: 2012, Page(s): C4
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## Aims & Scope

Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief

Chi K. Michael Tse
Dept. of Electronic and Information Engineering
Hong Kong Polytechnic University
Hunghom, Hong Kong
cktse@ieee.org