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US 7,202,736 B1Granted
CDMA power amplifier design for low and high power modes
AssigneeAnadigies, Inc.
InventorsGee Samuel Dow, Jianwen Bao, Chun-Wen Paul Huang
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AssigneeAnadigies, Inc.
InventorsGee Samuel Dow, Jianwen Bao, Chun-Wen Paul Huang
Estimating the term…
An amplifier circuit responsive to a power mode signal improves efficiency at low power levels without compromising efficiency at high power levels. At low power levels, high impedance is presented with suitable adjustment in the phase of the signal. Also, providing for predistortion linearization improves high power efficiency and switching the predistortion linearizer OFF at low power levels contributes little more than a small insertion loss. The power amplifier also uses a bias circuit incorporating a dual harmonic resonance filter to provide high impedance at a fundamental frequency and low impedance at a second harmonic. These properties are of particularly advantageous since amplifiers in cell-phones are used in low power modes most of the time although they are designed to be most efficient at primarily the highest power levels.
A method for improving amplifier efficiency, comprising:
A power amplifier circuit with improved efficiency, comprising:
A method of providing multiple power modes in a power amplifier circuit, the method comprising:
A method of providing multiple power modes in a power amplifier circuit, the method comprising:
Dependencies are inferred from the claim text.