Compact MMIC active inductor

Avitabile, G.; Chellini, B.; Limiti, Ernesto; Giannini, F

doi:10.1109/mwsym.2001.967206

Cited by 1 publication

(1 citation statement)

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“…So far, several papers have been presented in the literature describing integrated solutions, using equivalent active inductors instead of passive, spiral inductors. These circuits are generally grounded or floating active inductors. Nevertheless, up to now, there is a lack in the commercial market of such a kind of solutions being necessary a further theoretical and practical significant effort in this field.…”

Section: Introductionmentioning

confidence: 99%

RF and microwave high‐Q floating active inductor design and implementation

Branchi

Pantoli

Stornelli

et al. 2014

Circuit Theory & Apps

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In this paper, a high-Q floating active inductor (FAI), suitable for RF and microwave applications, is presented. The proposed FAI is based on two cascaded pairs of highly linear capacitance gyrators, which provide a symmetric and reciprocal structure. The proposed FAI shows fully symmetrical two-port characteristics, high quality factor and high linearity. As a feasibility demonstration, a prototype of the designed FAI has been fabricated, together with an LC series band-pass filter. At the operating frequency, the real part of the impedance of the equivalent FAI is very low (Req = 0.0039 Ω), providing a very high quality factor. The filter has a central frequency of 430 MHz and a À3 dB bandwidth of about 9 MHz. and that the model in Figure 1 is no more valid. In order to overcome this problem, the ideal circuit has been duplicated, as shown in Figure 6, being now symmetrical and reciprocal. Additionally, a simple RC-based compensating network with a symmetrical structure has been also added (see Figure 7), in order to have the circuit impedances as shown in Figure 3.The novel circuit configuration has been analyzed by means of the proposed equivalent model, optimizing eqns. (2), (3) and (4) to behave as in Figure 3. In Figure 8 the Z 1 , Z 2 and Z 3 impedances of the complete FAI of Figure 7 are shown. The imaginary part of Z 1 clearly shows the inductive Figure 3. Required impedance values versus frequency for the design of a floating active inductor as a π network.Figure 4. Cascaded gyrators with real components. 1098 P. BRANCHI ET AL.

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Section: Introductionmentioning

confidence: 99%