Variable gain current mirror for high-speed applications

Sedighi, Behnam; Bakhtiar, Mehrdad Sharif

doi:10.1587/elex.4.277

Cited by 20 publications

(15 citation statements)

References 5 publications

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“…8. This confirms that the quality factor can be adjusted by I B4 , which is independent of the pole frequency, as analyzed in (10) and (11). Figure 9 shows the gain responses of the bandpass functions where I B is set to 40 µA, 80 µA, and 160 µA, respectively, and k = 0.3.…”

Section: Simulation Resultssupporting

confidence: 77%

See 1 more Smart Citation

Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

Siripruchyanun

Jaikla

2008

Circuits Syst Signal Process

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This article introduces a circuit which can function both as a quadrature oscillator and as a universal biquad filter (lowpass, highpass, bandpass). When the circuit functions as a universal biquad filter, the quality factor and pole frequency can be tuned orthogonally via the input bias currents. When it functions as a quadrature oscillator, the oscillation condition and oscillation frequency can be adjusted independently by the input bias currents. The proposed circuit can work as either a quadrature oscillator or a biquad filter without changing the circuit topology. The amplitude of the proposed oscillator can be independently controlled via the input bias currents. The proposed oscillator can be applied to provide amplitude modulated/amplitude shift keyed signals with the above-mentioned major advantages. The circuit is very simple, consisting of four dual-output second generation current controlled current conveyors (DO-CCCIIs), one operational transconductance amplifier (OTA), and two grounded capacitors. Without any external resistors and using only grounded elements, this circuit is therefore suitable for IC architecture. PSPICE simulation results are depicted here, and the given results agree well with the theoretical analysis. The power consumption is approximately 7.32 mW at ±2.5 V supply voltages.

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Section: Simulation Resultssupporting

confidence: 77%

“…From (10) and (11), if I B2 = I B3 = I B and I B4 = kI B , which can be easily realized by using a programmable current mirror [1,11], then the pole frequency and quality factor are subsequently modified to be…”

Section: The Dual-output Second Generation Current-controlled Currentmentioning

confidence: 99%

Cascadable Current-Mode Biquad Filter and Quadrature Oscillator Using DO-CCCIIs and OTA

Siripruchyanun

Jaikla

2008

Circuits Syst Signal Process

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“…It seems to be a very interesting topic for researchers. Some novel types of current conveyors (Mahmound et al [9], Kumngern et al [10]), so-called current followers and nullors (Sedighi et al [11], Tangsrirat [12], Tangsrirat et al [13]), have been published quite recently. Alzaher et al [14,15] and Koton et al [16] utilized digital control of current gain in their active elements and applications.…”

Section: Introductionmentioning

confidence: 99%

An Additional Approach to Model Current Followers and Amplifiers with Electronically Controllable Parameters from Commercially Available ICs

Šotner¹,

Kartci²,

Jeřábek³

et al. 2012

Measurement Science Review

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Several behavioral models of current active elements for experimental purposes are introduced in this paper. These models are based on commercially available devices. They are suitable for experimental tests of current-and mixed-mode filters, oscillators, and other circuits (employing current-mode active elements) frequently used in analog signal processing without necessity of onchip fabrication of proper active element. Several methods of electronic control of intrinsic resistance in the proposed behavioral models are discussed. All predictions and theoretical assumptions are supported by simulations and experiments. This contribution helps to find a cheaper and more effective way to preliminary laboratory tests without expensive on-chip fabrication of special active elements.

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“…Overall, the integrator circuit is found to have very good linearity and an impressive tuning performance, indicated by the DC transfer data in Fig.8b. The unique feature of this circuit is the common node between the upper and lower CM blocks, which prevents the development of DC offsets by the concurrent modulation of these blocks by the input capacitance C. The lack of DC offset at the output which often plague such tunable circuits (Sedighi & Bakhtiar, 2007;Zeki et al, 2001) is a distinguishing characteristic of this circuit. Using the integral function method developed by Cardeira and co workers (Cerdeira et al, 2004), it is possible to analyze the same DC transfer curves to calculate total harmonic distortion as well as the 3 rd harmonic distortion (HD3) as shown in Fig.8c.…”

Section: Current-mode Integrator and High-order Filtersmentioning

confidence: 99%