A 100 Mb/s BiCMOS adaptive pulse-shaping filter

Shoval, A.; Snelgrove, W.M.; Johns, D.A.

doi:10.1109/49.475541

Cited by 14 publications

(3 citation statements)

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“…To copy otherwise, or to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. an envelope detector [10], delta-sigma oscillator [2] or mixed analog/digital approaches [9] to adjust the Q factor to a desired value. None of these methods were implemented in an all continuous time domain.…”

Section: Quality Factor Tuning Schemementioning

confidence: 99%

“…For accurate filter performance, fairly accurate, low tolerance component values are required. Since these are not normally available because of fabrication tolerances or varying operating conditions, the generally adopted solution is to design an automatic electronic tuning scheme as part of the total continuous time filter circuitry [2,[9][10]. Fundamentally, the steps implied in tuning are measuring the filter performance, comparing it with a desired value, calculating the error, and applying a correction factor to the filter to reduce the error.…”

Section: Introductionmentioning

confidence: 99%

“…The tuning circuit must therefore, detect and identify any mismatch, compute the appropriate corrections, and apply them via a suitable control circuit to the filter. Almost all existing tuning scheme used today in integrated analog filters employ the master-slave concept [2,4,[9][10]. Tuning is typically accomplished by applying a correction voltage or current to both the master and slave filters simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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VLSI implementation of an automatic Q tuning system

Salmeh

Maundy

2004

Proceedings of the 14th ACM Great Lakes Symposium on VLSI

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In this paper we present an innovative approach to VLSI implementation of Q tuning of analog lowpass filters. The proposed scheme uses the LMS algorithm to adaptively compensate changes in input amplitude and frequency. A tunable OTA is designed to implement the automatic control loop in the integrated circuit. The tuning system was implemented in CMOS 0.18 µ m technology in a master-slave configuration. Categories and Subject Descriptors[Algorithm]: A modified LMS algorithm can be used to automatically tune the Q of lowpass and highpass filters. General TermsAlgorithms, measurement, design, experimentation, performance.

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Section: Quality Factor Tuning Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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VLSI implementation of an automatic Q tuning system

Salmeh

Maundy

2004

Proceedings of the 14th ACM Great Lakes Symposium on VLSI

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Continuous‐time filter featuring Q and frequency on‐chip automatic tuning

Otín

Celma

Aldea

2009

Circuit Theory & Apps

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SUMMARYThe on-chip automatic tuning of digitally programmable continuous-time G m -C filters with a wide operation range employing a hybrid analog-digital master-slave scheme is reported in this work. The master system is implemented with a voltage-controlled filter (VCF) with the same programmable transconductance cells as the main filter to enhance the matching between master and slave. The frequency tuning method, for both analog and digital control, is based on a digital phase comparator included in the phase-locked loop achieving high-precision tunability. The digital frequency tuning is obtained with an error of ±4% and the maximum settling time when changing between two consecutive digital words is 0.3 s. Once the digital word is fixed, the analog tuning finely adjusts the value of the characteristic frequency to the reference and corrects for possible temperature variations with a settling time of 0.2 s. The analog frequency control covers the whole discrete step with a maximum error of ±5%. Furthermore, a magnitude-locked loop (MLL) Q-tuning block is simultaneously applied to the system in order to precisely control the quality factor of the G m -C filter by using an appropriate envelope detector. According to the obtained results, both post-layout simulation and experimental results, the adopted scheme has resulted as a useful and adequate solution to implement the complete auto-tuning system of digitally programmable continuous-time filters, including frequency and Q-control.

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