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US 2017/0324386 A1Published application
Rf class ab cascode amplifier with linearization and steering diodes
AssigneeARRIS Enterprises LLC
InventorMarcel F. Schemmann
Life of this patent
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Abstract
Systems and methods for amplifying signals. In some embodiments, the signals may be amplified using a diode steering network with an amplifier operated in class AB mode. In some embodiments, distortion in the amplified signal may be corrected using a feed forward cancellation circuit operated in class A mode.
Claims20
A class AB amplifier circuit comprising:
- an input capable of receiving an input signal that drives first and second transistors arranged in a differential pair, the transistors amplifying the input signal;
- an output for the amplified input signal from the first and second transistors;
- the output comprising a first load and a second load a steering network comprising a plurality of steering diodes, the steering network selectively directing a first phase of the input signal to the first load and a second phase of the input signal to the second load.
A feed forward distortion cancellation circuit comprising:
- a first pair of transistors amplifying an input signal;
- and
- a second pair of transistors arranged in a cascade output stage, the second pair of transistors substantially reproduce the currents in the collectors of the first pair of transistors.
A method for correcting distortion in an amplified input signal the method comprising:
- receiving an input signal;
- generating an amplified signal in a first stage using the input signal, the first stage operated in class AB mode
- generating an error signal in a second stage using the input signal, the second stage operated in class A mode;
- and
- using the error signal to correct distortion in the amplified signal.
2 more elements
Dependencies are inferred from the claim text.