A 0.49–13.3 MHz Tunable Fourth-Order LPF with Complex Poles Achieving 28.7 dBm OIP3

Payandehnia, Pedram; Maghami, Hamidreza; Mirzaie, Hossein; Kareppagoudr, Manjunath; Dey, Siladitya; Tohidian, Massoud; Temes, Gábor C.

doi:10.1109/tcsi.2017.2788466

Cited by 32 publications

(20 citation statements)

References 20 publications

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“…Multistage operational transconductance amplifier (OTA) in closed‐loop configuration is one of the basic building blocks used extensively to buffer and amplify the voltage and current signals generated by a variety of integrated circuits (ICs), from discrete‐time switched‐capacitor analog‐to‐digital and digital‐to‐analog converters to continuous‐time filters, low‐dropout regulators (LDOs), audio amplifiers and active‐matrix liquid crystal displays (LCDs), micro‐electro‐mechanical systems (MEMS), and line drivers . Many applications falling into these categories favor an amplifier that can drive a naturally variable load capacitor ( C L ) since this parameter experiences remarkable excursions during the start‐up and normal operation of the OTA.…”

Section: Introductionmentioning

confidence: 99%

Global impedance attenuation network for multistage OTAs driving a broad range of load capacitor

Aminzadeh

Valinezhad

Grasso

2020

Circuit Theory & Apps

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Summary Advanced multistage amplifiers suffer from load‐dependent stability issues, which limit the load capacitor range they can drive. In this work, the concept of global impedance attenuation (GIA) network is introduced to improve an amplifier's stability in the presence of significant load capacitor variations. Composed of multiple parallel resistor‐capacitor (RC) branches, the equivalent high‐frequency output impedance of gain stages is shaped by the GIA network such that a desired frequency spectrum is obtained over a wide range of load capacitor. The parasitic poles at the output of the gain stages are nullified by the proposed network, thereby simplifying the amplifier's transfer function and reducing the minimum load capacitor it can drive. The idea is applied to design a three‐stage operational transconductance amplifier (OTA) with cascode global impedance attenuation (CGIA). Small‐signal analysis shows that the OTA is stable regardless of the load capacitor, and it can drive very small to ultra‐large load capacitors. This feature is verified by the post‐layout simulations of a CGIA amplifier in 0.18‐μm complementary metal‐oxide semiconductor (CMOS) process. The core occupies a die area of 0.0053 mm2 while consuming a static current of 10.97 μA from 1.8‐V voltage supply. The unity‐feedback configuration is unconditionally stable for any load capacitor higher than 10 pF. To the best of our knowledge, this corresponds to the widest range of load capacitance reported for prior‐art three‐stage amplifiers.

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Section: Introductionmentioning

confidence: 99%

Global impedance attenuation network for multistage OTAs driving a broad range of load capacitor

Aminzadeh

Valinezhad

Grasso

2020

Circuit Theory & Apps

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“…However, multiple transconductors means multiple noise sources and a poor power to noise trade-off. Alternatives are the discretetime analog IIR approaches of [4][5][6], but they do not achieve sharp filtering.…”

Section: Introductionmentioning

confidence: 99%

A 0.06–3.4-MHz 92-$\mu$ W Analog FIR Channel Selection Filter With Very Sharp Transition Band for IoT Receivers

Thijssen

Klumperink

Quinlan

et al. 2019

IEEE Solid-State Circuits Lett.

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Analog FIR filtering is proposed to improve the performance of a single stage gm-C channel selection filter for ultra low power Internet-of-Things receivers. The transconductor is implemented as a Digital-to-Analog Converter; allowing a varying transconductance in time, which results in a very sharp FIR filter. The filter is manufactured in 22 nm FDSOI and has a core area of 0.09 mm 2 . It consumes 92 µW from a 700 mV supply and achieves f −60dB /f −3dB = 3.8. The filter has 31.5 dB gain, out-of-band OIP3 of 28 dBm and output referred 1-dB compression point of 3.7 dBm. The filter bandwidth is tunable from 0.06 to 3.4 MHz.

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“…This makes the ability of reconfigurability even more important for an RF front end. For a fully reconfigurable RF system, the core components in the system such as filter, power divider, and antenna should also be reconfigurable …”

Section: Introductionmentioning

confidence: 99%

“…For a fully reconfigurable RF system, the core components in the system such as filter, power divider, and antenna should also be reconfigurable. [3][4][5][6][7] Among the components, the hybrid coupler is considered to be one of the most important ones, as it provides the signals with desired amplitude and phase characteristics for the next module. To support different wireless communication standards, several approaches to achieve the tunability in operating frequency have been proposed in References 8-10.…”

Section: Introductionmentioning

confidence: 99%

A phase tunable hybrid coupler with enhanced bandwidth

Zheng

Long

2019

Int J RF Microw Comput Aided Eng

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The majority of the previous works on tunable coupler concentrates on the tunability of the frequency and amplitude. The capability to control the phase characteristics draws little attention. However, the tunability in phase becomes more and more important, as the flexible control in phase affects the performance significantly in the modern wireless communication systems. Regarding this, several phase tunable couplers were proposed but with narrow bandwidth. In this article, a novel phase‐tunable coupler with enhanced bandwidth is proposed. It is constructed by introducing two varactor loaded coupled line sections between two branch line sections. By varying the capacitances loaded on and between the coupled lines, the continuously tunable phase difference can be achieved between two output ports without affecting the equal power division characteristics. The analysis of the ideal model and detailed circuit has been conducted to obtain the design formulas and guidelines. For demonstration, a phase tunable coupler operating at 1.8 GHz was designed, fabricated, and measured. It exhibits a tunable phase difference from 60° to 120° by varying the two biasing voltages. Meanwhile, the equal power division, good return loss, and high isolation are still maintained. The desired characteristics have been implemented over a wide bandwidth from 1.6 GHz to 2.0 GHz.

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A 0.49–13.3 MHz Tunable Fourth-Order LPF with Complex Poles Achieving 28.7 dBm OIP3

Cited by 32 publications

References 20 publications

Global impedance attenuation network for multistage OTAs driving a broad range of load capacitor

Global impedance attenuation network for multistage OTAs driving a broad range of load capacitor

A 0.06–3.4-MHz 92-$\mu$ W Analog FIR Channel Selection Filter With Very Sharp Transition Band for IoT Receivers

A phase tunable hybrid coupler with enhanced bandwidth

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