Tunable active inductor

Details Tunable active inductor Tunable active inductor

2007-08-07

2007-08-07

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Negative resistance or reactance networks of the active type

Simulating specific type of reactance

C333S215000

Reexamination Certificate

active

11141123

ABSTRACT:
An active inductor capable of tuning a self-resonant frequency, an inductance, a Q factor, and a peak Q frequency by applying a tunable feedback resistor to a cascode-grounded active inductor is disclosed. The tunable active inductor includes a first transistor having a source connected to a power supply voltage and a gate connected to first bias voltage; a second transistor having a drain connected to a drain of the first transistor and a gate connected to a second bias voltage; a third transistor having a drain connected to a source of the second transistor and a source connected to a ground voltage; a fourth transistor having a drain connected to a gate of the third transistor, a source connected to the ground voltage and a gate connected to a third bias voltage; a fifth transistor having a source connected to the drain of the fourth transistor and a drain connected to the power supply voltage.

REFERENCES:
patent: 5227681 (1993-07-01), Koyama et al.
patent: 5825265 (1998-10-01), Fujii
patent: 6028496 (2000-02-01), Ko et al.
patent: 6765377 (2004-07-01), Lu
patent: 7075380 (2006-07-01), Singh et al.
patent: 2006/0170512 (2006-08-01), Jeon et al.
patent: 2006/0197617 (2006-09-01), Mukhopadhy et al.

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