Tunable circuit including a switchable inductor

Details Tunable circuit including a switchable inductor Tunable circuit including a switchable inductor

2006-08-15

2006-08-15

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S305000

Reexamination Certificate

active

07091784

ABSTRACT:
The frequency of a differential circuit can be advantageously adjusted using a switchable inductor. Specifically, the switchable inductor allows a base inductance to be increased by activating one of a plurality of inductor stages. A switch in an inductor stage can be opened to activate that inductor stage. In one embodiment, the switch can be implemented using a PMOS transistor and closing the switch means turning on the PMOS transistor. Advantageously, the switches have non-ideal behavior when closed which may be mitigated by disposing the switch between differential sides of a circuit, thereby providing a more optimal Q for certain applications. Moreover, the switches ensure that the first and second sides of the differential circuit receive an equal resistance to a virtual ground.

REFERENCES:
patent: 6342813 (2002-01-01), Imbornone et al.
patent: 6411168 (2002-06-01), Yoshida
patent: 6556416 (2003-04-01), Kunihiro
patent: 6882226 (2005-04-01), Cho et al.

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