Tuning RF circuits using switched inductors provided in a...

Details Tuning RF circuits using switched inductors provided in a... Tuning RF circuits using switched inductors provided in a...

2007-02-06

2007-02-06

Lee, Benny (Department: 2817)

Tuners

With switching means

Inductor only modified or substituted by switching

C334S060000, C334S064000

Reexamination Certificate

active

10842825

ABSTRACT:
A Radio Frequency (RF) circuit includes an active portion and a tuned portion. The active portion receives an RF signal and that operates upon the RF signal. The tuned portion couples to the active portion and includes a first inductor, a second inductor, and a switch. When the switch is closed, the second inductor couples to the first inductor and the tuned portion has first tuning characteristics. When the switch is open, the second inductor is decoupled from the first inductor and the tuned portion has second tuning characteristics. The tuned portion may include lumped or parasitic capacitance. The tuned portion alternately includes an inductor having a first terminal, a second terminal, an intermediate tap, and a switch that couples between the second terminal and the intermediate tap. When the switch is closed the tuned portion has first tuning characteristics and when the switch is open, the tuned portion has second tuning characteristics.

REFERENCES:
patent: 3611154 (1971-10-01), Kupfer
patent: 3903487 (1975-09-01), Maier
patent: 5300904 (1994-04-01), Andersen
patent: 6052033 (2000-04-01), Schneider
patent: 6366166 (2002-04-01), Belot
patent: 6703920 (2004-03-01), Zimmer
patent: 1 058 384 (2000-12-01), None
patent: 1 282 227 (2003-02-01), None

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