Inductance Simulator with Electronic Controllability Using Single VDDDA

A Single Parameter Voltage Adjustable Immittance Topology for Integer- and Fractional-Order Design Using Modular Active CMOS Devices

“…The circuit topologies introduced in [20] and [27] are the most similar to our proposal. However, in the case of [20], there are significant differences in the: a) dependence of g m on the driving force (voltage vs current), b) topology (connection of the feedback passive element), c) availability of L eq and, d) way of verification (commercially available devices in [20]).…”

“…Content may change prior to final publication. According to the survey presented in Table 1, the following conclusions were established: a) Maximally two simple [14], [15] or one single active device composed from internal subparts [12], [13], [16]- [27], where some devices have more sophisticated internal complexity [19]- [22], are sufficient for construction of a capacitance multiplier, b) Most of the proposed topologies offer only one type of the requested immittance character (C eq or L eq ), both functions are available rarely [24]- [26], c) Most of the solutions use a driving current for the nonlinear adjustment of nonlinear transconductance (for large values of input voltage) in simple or basic OTA topologies [12]- [25], d) In many cases, dependence of transconductance on the bias driving current (or directly on bias voltage) is nonlinear (CMOS concepts) [13], [14], [16], [17], [19]- [25], [27] (linear only for active devices with internal structures based on bipolar transistors [12], [15]) and the nonlinearity of parameter adjustment has also an impact on the character of tuning of C eq , e) Additional conversion (and linearization) of the driving current to DC voltage is required in many cases for adjustability range extension, except of [26] (lack of straightforward linear adjustment by control voltage in almost all cases), f) All solutions require also a passive parameter (except the controllable transconductance) for scalability of the adjustable range and, g) Only several solutions were tested experimentally [14], [18], [20], [21] and for fractional-order design.…”