A CMOS transconductance element with improved DC gain and wide bandwidth for VHF applications

Szczepański, S.; Schaumann, R.; Pankiewicz, Bogdan

doi:10.1007/bf00195560

Cited by 5 publications

(4 citation statements)

References 23 publications

(42 reference statements)

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“…The source should have very low distortion to permit easy and accurate THD measurements. This wide simulated bandwidth was verified with a nonquasi-static model [13] and can be explained because the OTA circuitry has no internal nodes and time constants causing slowdown, but in practice the 2 urn SPICE CMOS Level-2 model is likely not reliable at frequencies of more than 1 GHz . Figure 9a and 9b show two measured spectra for Vp = 1.2 V and 2.2 V, respectively, for computing the THD results in Fig.…”

Section: Simuation and Measurement Of Transconductance Range Linear mentioning

confidence: 85%

Simulation and Measurement of Fully-differential CMOS OTAs

Chiang¹,

Schaumann²,

Daasch³

1997

Frequenz

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Simulation and testing methods for fully-differential operational transconductance amplifier (OTA) circuits are described. Difficulties of measuring OTA performance caused by the generally large bandwidth of OTAs and the need for measuring current signals are illustrated. A fully-differential OTA fabricated through the MOSIS 2 -€ 8 technology is the demonstration circuit for simulations and tests. This OTA has a simulated 3 dB frequency of 1 GHz with a load of 100 . The simulation softwares are SPICE, Version 3f4, and ADS from Tektronix, Version 5a8. The measurement equipment includes a 500 MHz gainphase and spectrum analyzer, a 200 MHz oscilloscope, a 100 MHz synthesized arbitrary function generator, and high-precision power supplies. The approaches shown in this paper can be used to provide design guidelines for OTAs, and practical directions for the design of continuous-time filters.Übersicht:Simulations-und Testverfahren für OTAs (Operational Transconductance Amplifiers) mit Differenz-Einund Ausgangssignalen werden beschrieben. Die Schwierigkeiten bei der Untersuchung von OTA-Funktionen, verursacht durch die im allgemeinen große Bandbreite und die Erfordernis, Ströme zu messen, werden aufgezeigt. Simulation und Messungen werden an einem OTA mit differentiellem Ein-und Ausgang in MOSIS-2p-CMOS-Technologie demonstriert. Der OTA hat eine simulierte 3-dB-Bandbreite von l GHz bei Belastung mit 100 . Für die Simulation wird SPICE,

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Section: Simuation and Measurement Of Transconductance Range Linear mentioning

confidence: 85%

Simulation and Measurement of Fully-differential CMOS OTAs

Chiang¹,

Schaumann²,

Daasch³

1997

Frequenz

Self Cite

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“…8(b) shows an example of a circuit [18]. Others have been proposed in [14], [19], [22], [23], [29], and [36]. Using differential transconductors as a starting point, a configuration is also used in several circuits (sometimes referred to as crosscoupling or "current differencing," e.g., [8], [9], and [35]).…”

Section: )mentioning

confidence: 99%

“…However, many other complementary MOS (CMOS) circuits can be considered as transconductance-based circuits (e.g., [3]- [36]). 1 Most publications on transconductance-based CMOS circuits focus on specific aspects of one particular circuit.…”

Section: Introductionmentioning

confidence: 99%

A systematic approach to circuit design and analysis: classification of two-VCCS circuits

Klumperink

1999

IEEE Trans. Circuits Syst. I

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Abstract-This paper discusses a systematic approach to the design and analysis of circuits, using a transconductor or voltage controlled current source (VCCS) as a building block. It is shown that two independent Kirchhoff relations among the VCCS voltages and currents play a crucial role in establishing a unique transfer function in two-port circuits with two VCCS's. A class of two-VCCS circuits is defined, which can be subdivided into three main classes and 14 subclasses, based on different imposeable sets of two Kirchhoff relations. The classification is useful for circuit synthesis and analysis, as it reveals all the basically different ways to exploit two VCCS's, and allows for a unified analysis of classes of circuits. To exemplify this, all complementary metal-oxide-semiconducter (CMOS) V 0 I converter kernels, based on two matched MOS transistor (MOST)-VCCS's, are generated and analyzed with respect to distortion. It is shown that dozens of published transconductor circuits can be classified in only four classes, with essentially different distortion behavior.

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“…They demonstrated a simulated DC gain close 60 dB. Szczepanski et al also '•*>m1 (25) £dsl + Sds3 + Sds6 + Snù~Snf> used similar cross-coupled transistors to generate a negative transconductance [43]. They showed a SPICE simulated DC gain of 50dB.…”

Section: Problems Of Existing Circuit Implementations Of the Negativementioning

confidence: 99%

Strategies for enhancing DC gain and settling performance of amplifiers

Yan

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A CMOS transconductance element with improved DC gain and wide bandwidth for VHF applications

Cited by 5 publications

References 23 publications

Simulation and Measurement of Fully-differential CMOS OTAs

Simulation and Measurement of Fully-differential CMOS OTAs

A systematic approach to circuit design and analysis: classification of two-VCCS circuits

Strategies for enhancing DC gain and settling performance of amplifiers

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