Spral Inductor Coupling on 0.25 ¿m Epitaxial CMOS Process

A novel CMOS down-conversion mixer with body effect

“…In the same way, the use of halo substrate contacts as compared to using plain spiral inductors, also results in a decrease in the resonant frequency. This is consistent with the findings of [11], which attributes the increase in extracted shunt capacitance to fringing effects when using halo substrate contacts.…”

A Study on the Effects of the Structure of Passive Devices on the Performance of CMOS Low-Noise Amplifiers

“…In the same way, the use of halo substrate contacts as compared to using plain spiral inductors, also results in a decrease in the resonant frequency. This is consistent with the findings of [11], which attributes the increase in extracted shunt capacitance to fringing effects when halo substrate contacts are used.…”

“…It is also interesting to note that the effect of PGS on the amount of isolation, as shown in Table 1, is consistent with the results in [11], which states that using inductors with PGS improves isolation. The same study also inferred from its measured results that the use of inductors with halo substrate contacts do not improve isolation.…”

“…A study on single spiral inductors shows that the use of a patterned ground shield does not improve inductor Q [10]. However, [11] suggests that the use of PGS improves isolation between two inductors.…”

“…Both inductor implementations utilizing halo substrate contacts and patterned ground shields resulted in better input matching characteristics than the plain spiral inductor counterpart. This is expected because of an increase in series resistance of the inductor due to the formation of image currents produced by the magnetic field of the inductor in the halo substrate contact and to the image current produced in the ground shield of the inductor with PGS [11]. As for the circuit with octagonal inductors, a degradation in the input match is observed due to the reduced series resistance characteristic of this type of inductors [7].…”