Multi-mode bias circuit for power amplifiers

Details Multi-mode bias circuit for power amplifiers Multi-mode bias circuit for power amplifiers

2005-03-29

2005-03-29

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000

Reexamination Certificate

active

06873211

ABSTRACT:
According to an exemplary embodiment, a circuit arrangement includes a multi-mode bias circuit having a control voltage input, a mode control input for selecting between a linear mode and a saturation mode, and a bias output. The circuit arrangement further includes an amplifier having a bias input connected to the bias output of the multi-mode bias circuit, the amplifier having an RF input and an RF output. The multi-mode bias circuit causes the amplifier RF output power to be proportional to the RF input power when the mode control input selects the linear mode. Conversely, the multi-mode bias circuit causes the amplifier RF output power to be determined by the voltage at the control voltage input when the mode control input selects the saturation mode.

REFERENCES:
patent: 6359516 (2002-03-01), Luo et al.
patent: 6414553 (2002-07-01), Luo
patent: 6515546 (2003-02-01), Liwinski
patent: 6744321 (2004-06-01), Noh et al.

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