Using multiple-input transconductors to reduce number of components in OTA-C filter design

Wyszynski, A.; Schaumann, R.

doi:10.1049/el:19920135

Cited by 22 publications

(20 citation statements)

References 1 publication

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“…In the past, a multiple-input OTA was used to reduce the number of components, silicon area, and power dissipation in the OTA-C filter design where a third-order elliptic low-pass filter was built by five double-input OTAs instead of seven single-input OTAs [ 37 ]. Another example is the use of a two-input-stage OTA instead of a conventional OTA to build a leapfrog realization of a seventh-order elliptic filter in order to facilitate the signal addition required in the feedback paths of the leapfrog realization [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Universal Filter Based on Compact CMOS Structure of VDDDA

Jaikla

Khateb

Kulej

et al. 2021

Sensors

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This paper proposes the simulated and experimental results of a universal filter using the voltage differencing differential difference amplifier (VDDDA). Unlike the previous complementary metal oxide semiconductor (CMOS) structures of VDDDA that is present in the literature, the present one is compact and simple, owing to the employment of the multiple-input metal oxide semiconductor (MOS) transistor technique. The presented filter employs two VDDDAs, one resistor and two grounded capacitors, and it offers low-pass: LP, band-pass: BP, band-reject: BR, high-pass: HP and all-pass: AP responses with a unity passband voltage gain. The proposed universal voltage mode filter has high input impedances and low output impedance. The natural frequency and bandwidth are orthogonally controlled by using separated transconductance without affecting the passband voltage gain. For a BP filter, the root mean square (RMS) of the equivalent output noise is 46 µV, and the third intermodulation distortion (IMD3) is −49.5 dB for an input signal with a peak-to peak of 600 mV, which results in a dynamic range (DR) of 73.2 dB. The filter was designed and simulated in the Cadence environment using a 0.18-µm CMOS process from Taiwan semiconductor manufacturing company (TSMC). In addition, the experimental results were obtained by using the available commercial components LM13700 and AD830. The simulation results are in agreement with the experimental one that confirmed the advantages of the filter.

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Section: Introductionmentioning

confidence: 99%

Universal Filter Based on Compact CMOS Structure of VDDDA

Jaikla

Khateb

Kulej

et al. 2021

Sensors

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“…5b is modified from singleended fifth-order elliptic OTA-C filter in [41]. Thanks to using multiple-input transconductor in filter design the number of components can be reduced [42]. Hence, the proposed fully differential filter consists of five identical FDDTAs and five capacitors.…”

Section: Fddta-based Fifth-order Elliptic Low-pass Filtermentioning

confidence: 99%

Low‐voltage fully differential difference transconductance amplifier

Khateb¹,

Kumngern

Kulej³

et al. 2017

IET Circuits, Devices & Systems

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A new complementary metal-oxide-semiconductor (CMOS) structure for fully differential difference transconductance amplifier (FDDTA) is presented in this study. Thanks to using the non-conventional quasi-floating-gate (QFG) technique the circuit is capable to work under low-voltage supply of 0.6 V with extended input voltage range and with class AB output stages. The QFG multiple-input metal-oxide-semiconductor transistor is used to reduce the count of the differential pairs that needed to realise the FDDTA with simple CMOS structure. The static power consumption of the proposed FDDTA is 40 µW. The FDDTA was designed in Cadence platform using 0.18 µm CMOS technology from Taiwan Semiconductor Manufacturing Company (TSMC). As an example of applications a three-stage quadrature oscillator and fifth-order elliptic low-pass filter are presented to confirm the attractive features of the proposed CMOS structure of the FDDTA.

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“…Since OTA3 and OTA4 have a common output node, these two OTAs can finally be replaced by one differential double-input OTA34 as was postulated in [3]. Also, it would be possible to merge OTA5 with OTA34 forming a differential triple-input OTA, but since the ginvalue of OTA5 should be different from that of the others if the boost is to be adjustable, this solution is not practical.…”

Section: Boost Biquad Synthesismentioning

confidence: 99%

A current-mode biquadratic amplitude equalizer

Wyszynski

Schaumann

1993

Analog Integr Circ Sig Process

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Abstract. A boost biquad transfer function with two symmetrical zeros on the real axis is derived; it provides a technique for amplitude equalization with a second-order continuous-time gm-C section using current injection. The synthesis procedure yields a differential boost biquad consisting of three double-input OTAs and a single-input high-gm boost OTA. SPICE simulations show that for boost gain up to 20 dB the phase of the biquad is essentially unaffected. The presented technique is found suitable for amplitude equalization of disk-drive read channels operating in the range of 100 MHz.

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Using multiple-input transconductors to reduce number of components in OTA-C filter design

Cited by 22 publications

References 1 publication

Universal Filter Based on Compact CMOS Structure of VDDDA

Universal Filter Based on Compact CMOS Structure of VDDDA

Low‐voltage fully differential difference transconductance amplifier

A current-mode biquadratic amplitude equalizer

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