VCO controlled by one variable resistor

Hribsek, M.; Newcomb, R.W.

doi:10.1109/tcs.1976.1084197

Cited by 51 publications

(15 citation statements)

References 12 publications

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“…In particular, not only such circuits can be realized using current conveyors while avoiding complex design equations but also the resulting circuits employ invariably the least possible number of passive components. We highlight some exemplary circuits exhibiting these features from amongst many such circuits advanced by various researchers in the literature, for instance, [2,14,18,31,41,43,47,51,54,62].…”

Section: Srcos Employing Grounded Capacitorsmentioning

confidence: 99%

“…Using CCIIÀ made from LF356 type op-amp in supply current sensing mode implemented through current mirrors made from CA3096E mixed transistor arrays and the voltage buffer made from LM310N, the various claims of the circuit have been verified and the capability to realize voltage-controlled-oscillator have been verified by using the simplified single buffer based linearized VCR of [62].…”

Section: Srcos Employing Grounded Capacitorsmentioning

confidence: 99%

“…A common difficulty with the mentioned topologies was recognized to be their inability to provide variable frequency oscillations through only a single variable element, preferably a variable resistor. Hribsek and Newcomb were the first to propose a single-resistance-controlled oscillator using two IC op-amps [62]. Since then, efforts of the researchers were soon directed towards devising new topologies for such single-element-controlled oscillators (SECO)/SRCOs employing a single op-amp along with a canonical number of passive components namely, only two capacitors and at most five resistors.…”

Section: Introductionmentioning

confidence: 99%

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Realization of Sinusoidal Oscillators Using CCs

2014

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Section: Srcos Employing Grounded Capacitorsmentioning

confidence: 99%

Section: Srcos Employing Grounded Capacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Realization of Sinusoidal Oscillators Using CCs

2014

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“…By replacing appropriate conductor by FET-based voltagecontrolled resistor (VCR) (Hribsek andNewcomb 1976, Senani 1994), the quality factor Q can be controlled electronically that is particular advantage of the proposed circuit. The natural frequency ω 0 can be independently adjusted from the bandwidth, by varying C 2 , G 1 or g m of the proposed frequency filter.…”

Section: Proposed Universal Filter Structurementioning

confidence: 99%

“…Analogously, oscillation frequency ω 0 can be adjusted by controlling the value of the conductor G 1 and/or the capacitor C 1 without affecting the oscillation condition. Similarly, as the frequency filter, the oscillation condition and oscillation frequency of this solution might be adjusted using FET-based VCRs (Hribsek andNewcomb 1976, Senani 1994).…”

Section: Proposed Sinusoidal Oscillatormentioning

confidence: 99%

New voltage-mode universal filter and sinusoidal oscillator using only single DBTA

Herencsár

Koton

Vrba

et al. 2010

International Journal of Electronics

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In this paper, a new voltage-mode second-order universal frequency filter and sinusoidal oscillator using only single differential-input buffered and transconductance amplifier (DBTA) is presented. Proposed voltage-mode filter structure using single DBTA and four passive elements can provide all standard filter functions, i.e. low-, band-, high-pass, band-stop, and all-pass without changing the circuit topology and enables independent control of the quality factor Q using single passive element. The circuit requires the minimal number of active and passive elements with no conditions for component matching. By slight modification of the proposed filter structure, the new DBTA-based sinusoidal oscillator is easily obtained. The oscillation condition and the oscillation frequency are independently adjustable by different virtually grounded passive elements. The proposed sinusoidal oscillator employs only grounded capacitors. The passive and active sensitivities of all the proposed circuit configurations are low. PSPICE simulations using a BJT realization of DBTA and experimental results based on commercially available amplifiers OPA860 and MAX436 are included, which prove the workability of the proposed circuits.

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Ultralow‐frequency oscillator with switched capacitors

Miyazaki

Lim

Minamitake

et al. 1992

Electron Comm Jpn Pt II

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A very high and stable equivalent resistance can be realized if switched capacitors (SC) are used. The operating characteristics of a three‐phase SC oscillator are measured in which SCs are used in place of resistors in a low‐frequency CR oscillator. The amplitude of the phase shifter outputs is designed to be equal. From the squared sum of the instantaneous values of the outputs, a dc voltage proportional to the square of the oscillation amplitude is obtained to be used as the control voltage of the amplitude stabilizing circuit. The clock frequency of the SC and the oscillation frequency have a linear relationship. The experimental values agree well with the theoretical values. For constant circuit parameters, the oscillation frequency has been varied over more than five digits by changing only the clock frequency. A stable oscillation is observed at an extremely low frequency (10 μHz). A possibility of oscillation at frequencies lower than this value is demonstrated. The condition for steady‐state oscillation condition is given by the two sets of capacitance ratios. For the capacitors made with identical materials, the temperature coefficients are expected to be canceled. The problem of a long rise time of the oscillation at an extremely low frequency is resolved by reduction of the clock frequency after the amplitude has been stabilized within a short time by a high clock frequency. The effect of the equivalent parallel resistance on the characteristics of the ultralow‐frequency SC oscillator is discussed.

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VCO controlled by one variable resistor

Cited by 51 publications

References 12 publications

Realization of Sinusoidal Oscillators Using CCs

Realization of Sinusoidal Oscillators Using CCs

New voltage-mode universal filter and sinusoidal oscillator using only single DBTA

Ultralow‐frequency oscillator with switched capacitors

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