Power amplifier circuit for multi-frequencies and multi-modes and method for operating the same
First Claim
1. A multi-frequency and multi-mode Doherty-type power amplifying circuit, comprisingan input-signal processing unit, used to receive a radio frequency (RF) signal and to output a first signal and a second signal with equal or unequal powers;
- a first amplifier, having an input end coupled to the input-signal processing unit, and receiving the first signal to generate a first amplified signal, wherein the first amplifier further comprises a first transistor size adjusting unit that adjusts an equivalent transistor size according to a mode indication signal;
second amplifier, having an input end coupled to the input-signal processing unit, and receiving the second signal to generate a second amplified signal, wherein the second amplifier further comprises a second transistor size adjusting unit that adjusts an equivalent transistor size according to the mode indication signal; and
an output-signal processing unit, receiving the first and the second amplified signals, delaying a phase of the first amplified signal by 90 degrees and combining the phase-delayed first amplified signal and the second amplified signals, and then outputting an output signal.
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Abstract
A multi-frequency and multi-mode power amplifier is provided. The amplifier has a carrier power amplifier and a peaking power amplifier. The carrier power amplifier receives a first signal and outputs a first amplified signal, in which a first transistor size adjusting unit is included to adjust an equivalent transistor size based on a mode indication signal. The peaking power amplifier receives a second signal and outputs a second amplified signal, in which a second transistor size adjusting unit is included to adjust an equivalent transistor size based on the mode indication signal.
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Citations
16 Claims
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1. A multi-frequency and multi-mode Doherty-type power amplifying circuit, comprising
an input-signal processing unit, used to receive a radio frequency (RF) signal and to output a first signal and a second signal with equal or unequal powers; -
a first amplifier, having an input end coupled to the input-signal processing unit, and receiving the first signal to generate a first amplified signal, wherein the first amplifier further comprises a first transistor size adjusting unit that adjusts an equivalent transistor size according to a mode indication signal; second amplifier, having an input end coupled to the input-signal processing unit, and receiving the second signal to generate a second amplified signal, wherein the second amplifier further comprises a second transistor size adjusting unit that adjusts an equivalent transistor size according to the mode indication signal; and an output-signal processing unit, receiving the first and the second amplified signals, delaying a phase of the first amplified signal by 90 degrees and combining the phase-delayed first amplified signal and the second amplified signals, and then outputting an output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification