Power amplifier including a desensitized bias circuit

Details Power amplifier including a desensitized bias circuit Power amplifier including a desensitized bias circuit

2005-11-01

2005-11-01

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S343100, C455S333000, C333S203000, C333S203000

Reexamination Certificate

active

06961554

ABSTRACT:
A desensitized bias circuit for a power amplifier includes, in one embodiment, a notch filter incorporated into the bias circuit. The notch filter behaves as a resonant circuit at the operating frequency of the power amplifier, thus coupling to ground any RF energy that migrates from the power amplifier input to the bias circuitry. The notch filter acts as a virtual ground to couple any RF energy present in the bias circuit to ground. Various implementations of the bias circuitry including the notch filter can be used. In other embodiments, the invention includes phase cancellation circuitry in the bias circuit to suppress any RF energy in the bias circuit.

REFERENCES:
patent: 4924194 (1990-05-01), Opas et al.
patent: 5905409 (1999-05-01), Fujimoto et al.
patent: 6331799 (2001-12-01), Miyazawa
patent: 6639465 (2003-10-01), Samelis et al.
patent: 2004/0251966 (2004-12-01), Yeh

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