Back to results
US 2009/0015334 A1Published application
Bypass Circuit for Radio-Frequency Amplifier Stages
AssigneeInfineon Technologies AG
InventorWinfried Bakalski
Life of this patent
Estimating the term…
Abstract
An amplifier circuit includes an amplifier and a phase shifter coupled in parallel to the amplifier and switchable such that the phase shifter has a first impedance for an alternating signal in an on state and has a second impedance for the alternating signal in an off state. The second impedance is higher than the first impedance.
Claims26
An amplifier circuit comprising:
- an amplifier;
- and
- a phase shifter coupled in parallel to the amplifier and switchable such that the phase shifter has a first impedance for an alternating signal in an “on” state and has a second impedance for the alternating signal in an “off” state, the second impedance being higher than the first impedance.
An amplifier circuit comprising:
- a transistor;
- and
- a switchable phase shifter coupled in parallel to the transistor, the phase shifter comprising two capacitances in series, that are coupled in parallel between a control terminal and a drain terminal of the transistor, the phase shifter further comprising an inductance including a first terminal coupled to a circuit node between the two capacitances, the inductance also including a second terminal coupled to a switch so that the second terminal of the inductance is coupled to a reference potential when the switch is closed.
A method for bypassing an amplifier, the method comprising:
- coupling a switchable phase shifter in parallel to the amplifier so that the phase shifter has a first impedance for an alternating signal in an “on” state and has a second impedance for the alternating signal in an “off” state, the second impedance being higher than the first impedance.
Dependencies are inferred from the claim text.