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An active RC circuit employing a single finite-gain amplifier, one two-port and two one-ports, has been presented here for the realization of a general voltage transfer function without positive real axis zeros. The comparative merit of the scheme with respect to that proposed by Rao (1969) are that the synthesis procedure is simpler and the number of passive circuit elements required is smaller. The coefficient of realization of the synthesized transfer function can always be made equal to unity with the scheme. A few examples are included to illustrate the synthesis procedure. [ABSTRACT FROM AUTHOR]

An active R.C. structure using a fixed gain differential amplifier, two resistors and three one-ports, is presented for the realization of general voltage transfer functions including those having zeros on the positive real axis. The comparative merit of the scheme, with respect to the circuit presented recently by Natarajan (1970), is that, a smaller number of passive circuit elements is required for the synthesis of a general voltage transfer function. A few examples are included to illustrate the synthesis procedures.
In this paper, two active R.C. circuits based on a general structure using a fixed gain differential amplifier, two resistors and three R.C. one-ports for realizing general voltage transfer ratios have been proposed. The procedures for the synthesis of such transfer functions have also been presented with a few illustrative examples. The comparative merit of the circuits with respect to that of Natarajan (1970) is that the number of R.C. one-ports has been reduced from five to three, resulting in a smaller number of passive circuit elements. [ABSTRACT FROM AUTHOR]

Investigates the active resistance-capacitance (RC) realization of a non-minimum phase transfer function with adjustable gain constant. Technique in combining the output of a three-terminal network; Importance of the specified transfer function on the Fialkow-Gerst coefficient condition; Use of dual-inputs for two three-terminal RC networks.

A stable oscillator has been developed with an active frequency-selective circuit using a Wien network, adjusted below the threshold of regeneration, by providing amplitude-limited aperiodic positive feedback through a parallel path. With this method the amplitude of oscillation remains stable and can be controlled continuously while the amplitude distortion remains less than 1% even when the frequency is as low as 01 HZ. [ABSTRACT FROM AUTHOR]

The paper presents a class of active RC networks using a summation amplifier or a differential amplifier for realizing all-pass transfer functions of arbitrary order, having simple poles restricted to the negative real axis. Examples are given to realize second-order all-pass transfer functions with RC null network and with the phase-shifting network of a Wien bridge. [ABSTRACT FROM AUTHOR]

The paper describes an amplitude stabilized very low frequency sinusoidal oscillator generating a frequency as low as 001 Hz. It uses a second-order all-pass network and an operational amplifier interconnected in a feedback loop to form a highly selective amplifier. A secondary loop consisting of a squaring network is used to stabilize the amplitude of oscillation. The oscillator is analyzed and the experimental results are discussed. [ABSTRACT FROM AUTHOR]