scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Design of Band Pass Filter using active inductor for RF receiver front-end

01 Dec 2014-pp 296-301
TL;DR: This paper presents the active inductor based band pass filter using TSMC 0.18μm RF CMOS process using the PMOS cascode structure as the negative transconductor of a gyrator.
Abstract: The Band Pass Filters are commonly used in wireless receivers and transmitter. The usage of spiral inductor in the band pass filters requires large chip area which can increase the band pass filter size and is difficult to obtain high Q-factor. This paper presents the active inductor based band pass filter using TSMC 0.18µm RF CMOS process. The band pass filter is realized using active inductor with suitable input and output buffer stages. The active inductor circuit uses the PMOS cascode structure as the negative transconductor of a gyrator. This structure provides the negative resistance to reduce the inductor loss with wide inductive bandwidth and high resonance frequency. The tuning of the center frequency is achieved through the controllable current sources. This active inductor demonstrates a maximum quality factor of 244 with a 154nH inductance. The simulation result of band pass filter designed at 100MHz has the gain of 6.129 dB and input return loss of −11.474 dB. The simulated IIP3 is −19 dBm and power consumed by the BPF is 28mW.
Citations
More filters
Journal ArticleDOI
TL;DR: By increasing the inductance value of the matching network in constant operating frequency, the PAE peak moves from high power to low power levels without any degradation, and it is possible to maintain the power efficiency at the same maximum level for lower input drive levels.

26 citations


Cites background from "Design of Band Pass Filter using ac..."

  • ...Although, there is a little circuit complexity in the matching networks consisting of passive elements, spiral inductors and variable capacitors (varactors), the tuning range of varactors are limited, while spiral inductors are very bulky with low and fixed inductance, low quality factor and self-resonance frequency, sensitive to temperature variation at high frequencies, and incompatible with low cost standard CMOS processes [4]....

    [...]

  • ...Although the inductance value of the CASFAI is lower than that in [4,7,14], its maximum quality factor as well as its inductance range is higher, while dissipates less power than [4,7,8]....

    [...]

Journal ArticleDOI
TL;DR: A tunable RF bandpass filter using double resistive feedback floating active inductor (AI) based on gyrator-C topology has been proposed using 40 nm CMOS technology for 5 GHz WLAN applications.
Abstract: It has been a challenging task for the designers to implement on-chip bandpass filter at high frequency with better performance. In this paper, a tunable RF bandpass filter using double resistive feedback floating active inductor (AI) based on gyrator-C topology has been proposed using 40 nm CMOS technology for 5 GHz WLAN applications. Small signal analytical modelling determines the design parameters affecting the performance of proposed floating AI, which ascertains that the double resistive feedback increases the quality factor as well as inductance value. The proposed AI attains a maximum quality factor of 964, high inductance ranging from 420 to 2080 nH and wide inductive bandwidth varying from 550 MHz to 7.85 GHz. Total current drawn by the AI is 2.66 mA at 1.2 V power supply and occupies an area of 17.1 × 9.1 µm2. In order to validate the performance of AI, a second-order tunable bandpass filter with frequency range 5.15–5.35 GHz has been implemented, with a small fractional 3-dB bandwidth, quality factor and 1-dB compression point of 15 MHz, 346 and − 2.8 dBm respectively. The Bandpass filter attains the figure of merit of 92.16 dB and dynamic range of 150 dB-Hz.

3 citations

Journal ArticleDOI
TL;DR: This brief demonstrates the performance of the first active bandpass filter to implement an active inductor in gallium nitride (GaN) technology and was designed for LTE/WLAN applications to demonstrate the capabilities of the active induction.
Abstract: This brief demonstrates the performance of the first active bandpass filter to implement an active inductor in gallium nitride (GaN) technology Fabrication of the filter and inductor was done using a 05 $\mu \text{m}$ pHEMT GaN process with the system implemented on one 2 mm by 2 mm die The tuning range of the active filter was measured to be 749 MHz at a centre frequency of 339 GHz with separate amplitude and quality factor tuning An amplitude range for S21 was measured to be from −122 dB to 137 dB within the operating frequency range Taking advantage of the active inductor’s negative impedance the filter was able to produce a quality factor of 138 On-chip, the active inductor occupies an area of 350 $\mu \text{m}$ by 175 $\mu \text{m}$ compared to approximately 350 $\mu \text{m}$ by 350 $\mu \text{m}$ for their passive counterparts of similar inductance (a 50% decrease in size) The filter was designed for LTE/WLAN applications to demonstrate the capabilities of the active inductor

3 citations

Patent
04 Apr 2018
TL;DR: In this article, a delta sigma analog-to-digital converter (DSAC) is proposed for a differential radio frequency current (RFC) signal, which is based on the two or more separate differential feedback current signals and the differential RFC signal.
Abstract: Examples provide a delta sigma analog-to-digital converter, a radio front-end, a radio receiver, a mobile terminal and a base station. The delta sigma analog-to-digital converter (100) is suitable for a differential radio frequency current signal. The delta sigma analog to digital converter includes an integrator (110) with a differential input for a differential current signal, and a differential output for a differential voltage signal. The delta sigma analog to digital converter further includes a quantizer (120) with a differential input for the differential voltage signal and a differential output for a digitalized signal. The delta sigma analog to digital converter further includes two or more digital-to-analog converters (130), each with a differential input for the digitalized signal and a differential output for a differential feedback current signal, resulting in two or more separate differential feedback current signals. The differential current signal is based on the two or more separate differential feedback current signals and the differential radio frequency current signal.

2 citations

References
More filters
Journal ArticleDOI
TL;DR: In this paper, a second-order RF bandpass filter based on active inductor has been implemented in a 0.35 /spl mu/m CMOS process, which has 28dB spurious-free-dynamic-range (SFDR) and total current consumption (including buffer stage) is 17 mA with 2.7-V power supply.
Abstract: In this paper, a second-order RF bandpass filter based on active inductor has been implemented in a 0.35 /spl mu/m CMOS process. Issues related to the intrinsic quality factor and dynamic range of the CMOS active inductor are addressed. Tuned at 900 MHz with Q=40, the filter has 28-dB spurious-free-dynamic-range (SFDR) and total current consumption (including buffer stage) is 17 mA with 2.7-V power supply. Experimental results also show the possibility of using them to build higher order RF filter and voltage-controlled oscillator (VCO).

163 citations

Journal ArticleDOI
TL;DR: In this paper, a second-order active bandpass filter using integrated inductors was implemented in Si bipolar technology, which uses special techniques to make the quality factor and the center frequency tunable.
Abstract: A second-order active bandpass filter using integrated inductors was implemented in Si bipolar technology. The filter uses special techniques to make the quality factor and the center frequency tunable. For a nominal center frequency of 1.8 GHz and a quality factor of 35, the filter has 1 dB compression dynamic range of 40 dB, and draws 8.7 mA from a 2.8 V supply.

145 citations


"Design of Band Pass Filter using ac..." refers methods in this paper

  • ...A second order active band pass filter using integrated inductors implemented in Si bipolar technology consumed a high power dissipation of 68 mW [9]....

    [...]

Journal ArticleDOI
TL;DR: A novel wide-tuning high-Q active bandpass filter utilizing the active inductors is presented, and issues of theactive inductor related to Q -enhancement, noise, linearity, and stability are considered.
Abstract: In this paper, design techniques for an integrated RF bandpass filter are discussed. A novel wide-tuning high-Q active bandpass filter utilizing the active inductors is presented. Issues of the active inductor related to Q -enhancement, noise, linearity, and stability are considered. The circuit has been fabricated in an 0.18-mum CMOS process, and the filter occupies the active area of 150 times 200 mum2. Measurement results show that the filter centered at 3.82 GHz with about 36-MHz bandwidth (3-dB) is tunable in frequency from about 1.92 to 3.82 GHz, and it exhibits -15- to 1-dB compression point at 2.44 GHz with approximately 60-MHz bandwidth while the dc power consumes 10.8 mW.

58 citations

Proceedings ArticleDOI
08 Aug 2000
TL;DR: In this paper, the design of a very simple CMOS high-Q active inductor suitable for applications at low supply voltage and high frequencies is discussed, where the inductor value, L, and the quality factor, Q, are independently adjustable by two PMOS varactors (variable capacitors).
Abstract: The design of a very simple CMOS high-Q active inductor suitable for applications at low supply voltage and high frequencies is discussed. The inductor value, L, and the quality factor, Q, are independently adjustable by two PMOS varactors (variable capacitors). Alternatively, L can be tuned via a bias current. The inductor's DC level is set by a bias voltage. The self-resonance frequency, f/sub r/, is larger than 1GHz and very high values of Q, up to Q=/spl infin/, can be obtained so that circuit can be used for constructing high-frequency oscillators. The performance of the electronic inductor is demonstrated by simulation.

50 citations

Journal ArticleDOI
TL;DR: A novel CMOS circuit for obtaining a bandpass response from a triple-coupled-inductor arrangement is presented, featuring Q-enhancement and center frequency tuning by means of vector-modulating a current flowing through one of the coupled inductors.
Abstract: A novel CMOS circuit for obtaining a bandpass response from a triple-coupled-inductor arrangement is presented, featuring Q-enhancement and center frequency tuning by means of vector-modulating a current flowing through one of the coupled inductors. A 0.35-/spl mu/m CMOS LC filter prototype employing the technique has been fabricated and exhibits a center frequency tuning range of 11% around 1 GHz and Q values up to 180. The input 1-dB compression point is -13 dBm with Q set to 20 and a power consumption of 12.2 mW. Additionally, an input impedance matching scheme around a spiral transformer is presented, which tracks the center frequency of the filter. The active-LC approach can be applied to higher order filter responses and find applications in tunable building blocks for agile RF front ends and multistandard radios.

48 citations