Design of a 4-MHz analog integrated CMOS transconductance-C bandpass filter

Park, C.S.; Schaumann, R.

doi:10.1109/4.350

Cited by 138 publications

(33 citation statements)

References 6 publications

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“…These errors can be partially corrected using magnitude detection [2,3] and/or phase detection [4] techniques. The frequency of both tuning loops is preferred to be in the passband frequency range.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for the automatic tuning of continuous time filters

Silva-Martínez

Steyaert

Sansen

1991

1991 IEEE International Symposium on Circuits and Systems (ISCAS)

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A novel approach for the automatic tuning of Continuous-Time Filters (CTF) is introduced. This approach uses a charge comparison principle for the tuning of the pole frequency (coo) and the pulse response of a biquadratic filter for tuning the filter quality factor (Q). Both frequency and Q tuning are performed at lower frequency than the pole frequencies. Thus, these techniques reduce the tuning signal feedthrough in bandpass filters. The Q tuning include the filter high frequency effects. This Q tuning technique is well situated for narrow band filters. Simulated results and breadboard experimental results are presented and discussed.

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Section: Introductionmentioning

confidence: 99%

A novel approach for the automatic tuning of continuous time filters

Silva-Martínez

Steyaert

Sansen

1991

1991 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…With growing emphasis on miniaturization and integration, high-frequency signal filtering requirements are increasingly realized by gm-C filters because they have good high-frequency performance and are easy to build in integrated form with simple design procedures [1], [2], [3], [4]. Also, with filtering applications in many fields, such as communication circuits, video signal processing, and computer disk drives, and with increasing industrial demand for filters operating at higher frequencies, more attention is being paid to gm-C filters [5], [6].…”

Section: Introductionmentioning

confidence: 99%

“…A gm-C filter, therefore, contains only OTAs and (possibly all grounded) capacitors [8], [9] which results in the overall performance of the filter being critically dependent on that of the OTAs used. The literature contains many OTAs designed in CMOS technology with high-frequency response, good linearity, effective tuning capability, and high output impedance [2], [3], [4], [10], [11]. The literature contains many OTAs designed in CMOS technology with high-frequency response, good linearity, effective tuning capability, and high output impedance [2], [3], [4], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Design considerations for CMOS and GaAs OTAs: Frequency response, linearity, tuning, and common-mode feedback

Schaumann

1991

Analog Integr Circ Sig Process

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High-performance operational transconductance amplifiers (OTAs) are important in the design of highfrequency analog transconductance-C (gin-C) filters. Critical design considerations for OTAs are frequency response, linearity, tuning, output impedance, power supply rejection (PSR), and common-mode rejection (CMR). In CMOS technology, satisfactory OTA design techniques are available, except that the linear input range often is relatively small and the frequency response of the OTA is limited by the intrinsic speed of transistors. In this paper, a new approach is developed to increase the linear input range, and a trade-off between linearity and input range is discussed. A CMOS OTA with less than +0.4% linearity error over a very large input range is given as a design example. To achieve a very high frequency response, l~m depletion-mode GaAs MESFETs with high intrinsic speed are used to replace MOSFETs. Simple ac compensation, a new technique for output impedance enhancement, and a new tuning method for OTAs with all N-channel devices are used to design a GaAs OTA with very small parasitics and f-3JB = 7 GHz. To improve PSR and CMR, fully balanced structures are used for the OTAs. Design considerations for the interaction of the operation of common-mode feedback (CMF) and tuning are discussed, and improved CMF circuits are proposed. Using the GaAs OTA and considering the frequency limitations imposed by parasitics, the design of a high order ladder filter with 300MHz cutoff frequency is presented as an application.

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“…Examples include audio [1], [2], intermediate [3], [4], and video frequency applications [5], [6], as well as antialiasing filters in switched-capacitor systems. Different design approaches have been used in the realization of these filters, such as using voltage controlled integrators [1], [3], using MOSFETs as voltage controlled resistors together with capacitors and MOS operational amplifiers (MOSFET-C active filters) [2], [4], and using MOS transconductance elements and capacitors (transconductance-C active filters) [5], [6].…”

Section: Introductionmentioning

confidence: 99%

On-chip automatic tuning based on amplitude detection and its application in CMOS continuous-time filters

Ajjikuttira

Stromsmoe

Filanovsky

1991

Analog Integr Circ Sig Process

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This paper describes the results of investigation of a continuous-time CMOS voltage controlled IC filter using amplitude detectors in the tuning scheme in the form of an amplitude-locked loop. This tuning scheme is used to stabilize the filter characteristics. A prototype 20-kHz fifth-order Chebyshev low-pass filter with 0.1-dB passband ripple was realized to study the performance of the tuning scheme. Voltage controlled integrators were used as building blocks, and the design details of these integrators, whose unity-gain frequency can be varied from 8 to 32 kHz are given. Two amplitude detector circuits--a precision rectifier and an averaging rectifier--were used to test the tuning scheme. The filter cutoff frequency was held within 1% of its room temperature value over the temperature range of 0 ~ to 70 ~ All the circuits were fabricated in a standard 3-micron double-metal p-well CMOS process.

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Design of a 4-MHz analog integrated CMOS transconductance-C bandpass filter

Cited by 138 publications

References 6 publications

A novel approach for the automatic tuning of continuous time filters

A novel approach for the automatic tuning of continuous time filters

Design considerations for CMOS and GaAs OTAs: Frequency response, linearity, tuning, and common-mode feedback

On-chip automatic tuning based on amplitude detection and its application in CMOS continuous-time filters

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