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US 10,637,406 B2Granted
Power amplifier module
AssigneeMurata Manufacturing Co., Ltd.
InventorsShota Ishihara, Yusuke Shimamune
Life of this patent
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Abstract
A power amplifier module includes an amplifier that amplifies an input signal and outputs an amplified signal, an emitter follower transistor that supplies a bias signal to the amplifier to control a bias point of the amplifier, and a current source that supplies a control current which changes in accordance with a change in control voltage to a collector of the emitter follower transistor. The current source limits the control current to not greater than an upper limit.
Claims20
A power amplifier module comprising:
- a bias circuit configured to supply a bias signal to an amplifier;
- and
- a first current source configured to:
- supply a control current to the bias circuit,
- change the control current in accordance with a change in a control voltage of the first current source, and
- limit the control current to be less than or equal to an upper limit, the upper limit varying in accordance with the control voltage.
3 more elements
Dependencies are inferred from the claim text.