A CMOS fully-balanced continuous-time IFLF filter design for read/write channels

Chiang, D.H.; Schaumann, R.

doi:10.1109/iscas.1996.539835

Cited by 27 publications

(27 citation statements)

References 8 publications

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“…One of the standard techniques to improve the CMRR, PSRR and dynamic range of analogue integrated filters is to use fully differential structures [6, 71. Many OTAs suitable for such applications have been reported in recent years [2][3][4][5][8][9][10].…”

Section: -51mentioning

confidence: 99%

High-frequency two-input CMOS OTA for continuous-time filter applications

Glinianowicz¹,

Jakusz²,

Szczepański³

et al. 2000

IEE Proc., Circuits Devices Syst.

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A high-frequency fully differential CMOS operational transconductance amplifier (OTA) is presented for continuous-time filter applications in the megahertz range. The proposed design technique combines a linear cross-coupled quad input stage with an enhanced folded-cascode circuit to increase the output resistance of the amplifier. SPICE simulations show that DC-gain enhancement can be obtained without significant bandwidth limitation. The two-input OTA developed is used in hgh-frequency tuneable filter design based on IFLF and LC ladder simulation structures. Simulated results of parameters and characteristics of the OTA and filters in a standard 1 . 2~ CMOS process (MOSIS) are presented. A tuning circuit is also discussed.

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Section: -51mentioning

confidence: 99%

High-frequency two-input CMOS OTA for continuous-time filter applications

Glinianowicz¹,

Jakusz²,

Szczepański³

et al. 2000

IEE Proc., Circuits Devices Syst.

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“…Different architectures can result in significant performance differences for implementation of a given filter response. Design methods for high-order active filters including the cascade, LC ladder simulation, and multiple loop feedback (MLF) are well established [1][2][3][4][5][6][7][8]. The main drawback of the cascade realization is high sensitivity to filter parameter variations and component tolerances.…”

Section: Introductionmentioning

confidence: 99%

“…

Abstract: Read/write channels for hard disk drives (HDD) require high-frequency continuous time filters (CTF) [1][2][3][4][5]. A 650 MHz current-mode seventh-order 0.05° equiripple linear phase low-pass filter for computer hard disk read/write channels with data rates up to 1Gbit/s is presented in this paper.

…”

mentioning

confidence: 99%

A CMOS 650 MHz seventh-order current-mode 0.05° equiripple linear phase filter

Zhu

Sun

Moritz

2007

2007 50th Midwest Symposium on Circuits and Systems

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Read/write channels for hard disk drives (HDD) require high-frequency continuous time filters (CTF) [1][2][3][4][5]. A 650 MHz current-mode seventh-order 0.05° equiripple linear phase low-pass filter for computer hard disk read/write channels with data rates up to 1Gbit/s is presented in this paper. It is implemented in CMOS using a leap-frog multiple loop feedback structure. The operational transconductance amplifier (OTA) used is based on a differential pair and uses source degeneration to achieve linearization and tuning. Simulated using a standard 0.18µm CMOS process, the dynamic range at 1% THD of the filter is 48dB, cut-off frequency can be tuned from 590MHz to 690MHz, group delay ripple is about 5%, and power consumption is 370mW from supply voltage of 2.5V.

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“…For these reasons OTA-C filters have become the preferred choice for filtering tasks in mixed-signal ICs. In recent years, several integrated continuous-time filters with high frequency range and low power consumption have been realized successfully and used for read/write channels in hard disk drive systems [2][3][4][5][6][7][8][9]. Most of the filters are based on the cascade structure.…”

Section: Introductionmentioning

confidence: 99%

“…The cascade topology can be used to realize a filter with arbitrary transfer functions, but sensitivity is higher, in particular, as filter order increases. One of the solutions is to use the multiple loop feedback (MLF) structure [1][2][3]. The single-ended MLF OTA-C filter based on the leapfrog (LF) configuration for read channel application has been discussed in [3].…”

Section: Introductionmentioning

confidence: 99%

A 2V 0.25μm CMOS 250MHz Fully-differential Seventh-order Equiripple Linear Phase LF Filter

Hasan

Sun

2005 IEEE International Symposium on Circuits and Systems

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Abstract-A fully-differential seventh-order 0.05° equiripple linear phase low-pass filter based on multiple loop feedback (MLF) leapfrog (LF) topology is presented for read/write channels. The filter is designed and simulated with the proposed fully balanced, highly linear operational transconductance amplifier (OTA). This OTA contains two complementary differential cross-coupled input pairs and a pair of regulated cascode output in order to achieve both lowdistortion and wide dynamic rang in high-frequency operation. Simulations in 0.25µm CMOS show that the cutoff frequency of the low pass filter without and with gain boost ranges from 50 to 150MHz and 65 to 250MHz respectively, dynamic-range is over 65dB and total harmonic distortion is less than 40dB. The group delay ripple is less than 5% for frequencies up to 1.5 times of the cutoff frequency, and for a 2-volt power supply, the maximum power consumption is 216mW.

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A CMOS fully-balanced continuous-time IFLF filter design for read/write channels

Cited by 27 publications

References 8 publications

High-frequency two-input CMOS OTA for continuous-time filter applications

High-frequency two-input CMOS OTA for continuous-time filter applications

A CMOS 650 MHz seventh-order current-mode 0.05° equiripple linear phase filter

A 2V 0.25μm CMOS 250MHz Fully-differential Seventh-order Equiripple Linear Phase LF Filter

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A CMOS fully-balanced continuous-time IFLF filter design for read/write channels

Cited by 27 publications

References 8 publications

High-frequency two-input CMOS OTA for continuous-time filter applications

High-frequency two-input CMOS OTA for continuous-time filter applications

A CMOS 650 MHz seventh-order current-mode 0.05&#x00B0; equiripple linear phase filter

A 2V 0.25μm CMOS 250MHz Fully-differential Seventh-order Equiripple Linear Phase LF Filter

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A CMOS 650 MHz seventh-order current-mode 0.05° equiripple linear phase filter