Extending op amp capabilities by using a current- source power supply

Nordholt, E.H.

doi:10.1109/tcs.1982.1085163

Cited by 35 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present there is no commercial version of the FTFN. Nevertheless, there are several ways to simulate the FTFN required [8], [10], [11], [19], [21] and [22], with commercially available integrated circuits. The simulation results obtained from the circuit of Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The four-terminal floating nullor (FTFN), Fig. l(a), is a more flexible and versatile building block than the operational amplifier, the operational transconductance amplifier and the current-conveyor [8][9][10]. This explains the growing interest in using the FTFN in designing current-amplifiers, voltage-to-current converters, gyrators, floating immittances [10][11][12], current-mode active-RC filters [13][14][15][16], sinusoidal oscillators [17][18][19] and in designing current-mode active-RC quadrature sinusoidal oscillators [20].…”

Section: Introduction 2 Proposed Circuitmentioning

confidence: 99%

See 1 more Smart Citation

Grounded-Capacitor Current-Mode Sinusoidal Oscillators with Single-Element Controlled Amplitude and Phase Using Two FTFNs

Abuelma’atti¹,

Alzaher²

2000

Frequenz

View full text Add to dashboard Cite

Sinus-Oszillatoren vom Stromquellen-Typ aufgebaut mit zwei Nulloren, mit einseitig geerdeten Kapazitä-ten und einfacher Amplituden-und Phasensteuerung AbstractA new current-mode sinusoidal oscillator circuit is presented of which the frequency and phase are single-element controlled. The circuit has two output currents. The frequency of oscillation is controlled by using a grounded resistor without disturbing the condition of oscillation. The phase difference between the two output currents can be controlled using a grounded passive element (resistor or capacitor or inductor) without disturbing the frequency of oscillation. The theoretical results are confirmed using SPICE simulation. ÜbersichtEn neuer Sinusoszillator wird vorgestellt, dessen Amplitude und Phase jeweils mit einem einzigen Element eingestellt werden können. Der Schaltkreis hat zwei Stromquellen-Ausgänge. Die Oszillatorfrequenz wird mit einem einseitig geerdeten Widerstand eingestellt, ohne daß dabei die Schwingbedingung verletzt würde. Die Phasendifferenz zwischen den beiden Ausgangsströmen kann mit einem passiven, einseitig geerdeten Element (Widerstand oder Kapazität oder Induktivität) ohne Störung der Schwingfrequenz gesteuert werden. Die theoretischen Ergebnisse werden duch SPICE-Simulationen bestätigt.Für die Dokumentation Oszillator / Nullor / integrierte Analogschaltung

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introduction 2 Proposed Circuitmentioning

confidence: 99%

Grounded-Capacitor Current-Mode Sinusoidal Oscillators with Single-Element Controlled Amplitude and Phase Using Two FTFNs

Abuelma’atti¹,

Alzaher²

2000

Frequenz

View full text Add to dashboard Cite

show abstract

“…Another solution was far ahead of its time. It uses the collectors of current sensing output transistors as output terminal of the floating current source, employing zener diodes for level shifting [41]. This yields indeed a CCII-employing current source isolation.…”

Section: The Nullor a Universal Model For The Four Kinds Of Bamentioning

confidence: 99%

Negative feedback revisited

Arbel

1996

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

Rules are derived for choosing one among the four kinds of basic amplifiers to be embedded in a particular passive feedback network. The loop transmission is identified and conditions for mismatch are obtained from a unified analysis of feedback circuits. Past experience gained with voltage mode basic amplifiers, the laws of duality and mismatch are applied to choose the building blocks employed in the design of the remaining three kinds of basic amplifiers. This intuitive synthesis is confirmed by formal network transformations employing nullors.

show abstract

“…A more practical approach is to use current-source isolation and replace the batteries for zener diodes as shown in figure 14 [5]. Any mismatch in the two bias and Q2 pick up the positive and negative supply current, respectively, of an operational amplifier and conduct these currents towards the negative output terminal of the OFA.…”

Section: Class a Output Stagesmentioning

confidence: 99%

Design and applications of the operational floating amplifier (OFA): The most universal operational amplifier

Huijsing

1993

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

Abstract. The operational floating amplifier (OFA) is the most universal type of operational amplifier. Both input and output ports are floating ports, i.e., free from restrictive ground connections. The floating input port enables the OFA to accurately equate two voltages between the two input terminals, like a standard operational amplifier, but in addition to that the OFA is able to accurately equate two currents through the two terminals of the floating output port. Specific applications are given, such as current amplifiers, voltage-to-current converters, gyrators, hybrids, and filters. The concept of the OFA allows these analog transfer functions to be realized with the absolute minimum number of accurate internal and external elements necessary to accurately determine the transfer. The OFA does not need accurate internal matched elements, except for offset, to obtain accurate overall transfer functions° This is in contrast to other current-output devices, such as the current conveyer, which transfer depends on the accuracy of internal current mirrors. Several designs of class A and class AB OFAs based on different topologies are presented and compared. This paper gives an overview of the application, the specification, and the design.

show abstract

Extending op amp capabilities by using a current- source power supply

Cited by 35 publications

References 4 publications

Grounded-Capacitor Current-Mode Sinusoidal Oscillators with Single-Element Controlled Amplitude and Phase Using Two FTFNs

Grounded-Capacitor Current-Mode Sinusoidal Oscillators with Single-Element Controlled Amplitude and Phase Using Two FTFNs

Negative feedback revisited

Design and applications of the operational floating amplifier (OFA): The most universal operational amplifier

Contact Info

Product

Resources

About