Patent
Partial or complete amplifier bypass
TLDR
In this article, a power amplifier stage can be partially or completely bypassed so that multi-stage amplifiers can be built that allow wide dynamic range of power amplification to be obtained efficiently.Abstract:
A power amplifier circuit arrangement particularly useful for portable phones used in wireless systems. A power amplifier stage can be partially or completely bypassed so that multi-stage amplifiers can be built that allow wide dynamic range of power amplification to be obtained efficiently. A switch at the input of an amplifier stage couples an input signal either to an amplifier or to a bypass path. The output of the amplifier is coupled to a first impedance-transforming network. The bypass path includes a second impedance-transforming network. A third impedance transforming network couples the outputs of the first and second impedance transforming networks. The impedance transforming networks are constructed and arranged so that input and output signals see the correct load regardless of whether the amplifier is used or bypassed. Using the principles of this invention, multi-stage amplifiers can be constructed including input and bypass attenuators to achieve a wide range of gain levels.read more
Citations
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References
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Patent
Spread spectrum multiple access communication using satellite or terrestrial repeaters
TL;DR: In this article, a multiple access, spread spectrum communication system and method for providing high capacity communications to, from, or between a plurality of system users, using code-division-spread-spectrum communication signals is presented.
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High dynamic range closed loop automatic gain control circuit
Wheatley Charles E,Punch Derek N +1 more
TL;DR: In this paper, a closed loop automatic gain control (AGC) circuit with high dynamic range capabilities has an amplifier circuit for receiving an input signal, which is susceptible to variations in signal power, and a control signal.