Active antenna arrangement with Doherty amplifier
AssigneeKathrein-Werke KG
InventorLothar Schmidt
Life of this patent
Estimating the term…
Abstract
A Doherty amplifier (100) is described which comprises an input terminal (102) for receiving an input signal (101) and an output terminal (103) for providing an amplified signal (104) of the input signal (101). The Doherty amplifier is supplied by a first supply voltage and a second supply voltage which have opposite polarities in respect to a reference level.
Claims12
A Doherty amplifier having an input terminal for receiving an input signal and having an output terminal for providing an amplified signal of the input signal, the Doherty amplifier being supplied by a first supply voltage and a second supply voltage which have opposite polarities in respect to a reference level, the Doherty amplifier further comprising:
- a first transistor, having a first control input for receiving a first input signal derived from the input signal, having a first output, and having a first supply input connected to the second supply voltage;
- a second transistor, having a second control input for receiving a second input signal being derived from the input signal, having a second output, and having a second supply input connected to the second supply voltage, wherein the phase of the first input signal and the phase of the second input signal differ by 90 degrees and a constant current source is connected to the second output of the second transistor and the second supply input of the second transistor;
- a third transistor, being connected with a third supply input to the first output of the first transistor, and having a third control input connected to the reference level and having a third output for providing a first amplified signal of the first input signal;
- a fourth transistor, being connected with a fourth supply input to the second output of the second transistor and having a fourth control input connected to the reference level, and having a fourth output for providing a second amplified signal of the second input signal;
- and
- a phase shifting element connected between the third output of the third transistor and the fourth output of the fourth transistor for combining the first amplified signal and the second amplified signal in-phase thus forming the output signal of the Doherty amplifier.
A chip set comprising a Doherty amplifier having an input terminal for receiving an input signal and having an output terminal for providing an amplified signal of the input signal, the Doherty amplifier being supplied by a first supply voltage and a second supply voltage which have opposite polarities in respect to a reference level, the Doherty amplifier further comprising:
- a first transistor, having a first control input for receiving a first input signal derived from the input signal, having a first output, and having a first supply input connected to the second supply voltage;
- a second transistor, having a second control input for receiving a second input signal being derived from the input signal, having a second output, and having a second supply input connected to negative supply voltage, wherein the phase of the first input signal and the phase of the second input signal differ by 90 degrees, and a constant current source is connected to the second output of the second transistor and the second supply input of the second transistor;
- a third transistor, being connected with a third source supply input to the first output of the first transistor, and having a third control input connected to common ground and having a third output for providing a first amplified signal of the first input signal;
- a fourth transistor, being connected with a fourth supply input to the second output of the second transistor and having a fourth control input connected to common ground, and having a fourth output for providing a second amplified signal of the second input signal;
- and
- a phase shifting element connected between the third output of the third transistor and the fourth output of the fourth transistor for combining the first amplified signal and the second amplified signal in-phase thus forming the output signal of the Doherty amplifier.
An active antenna array comprising at least one Doherty amplifier having an input terminal for receiving an input signal and having an output terminal for providing an amplified signal of the input signal, the Doherty amplifier being supplied by a first supply voltage and a second supply voltage which have opposite polarities in respect to a reference level, the Doherty amplifier further comprising:
- a first transistor, having a first control input for receiving a first input signal derived from the input signal, having a first output, and having a first supply input connected to the second supply voltage;
- a second transistor, having a second control input for receiving a second input signal being derived from the input signal, having an output, and having a second supply input connected to the second supply voltage, wherein the phase of the first input signal and the phase of the second input signal differ by 90 degrees, and a constant current source is connected to the second output of the second transistor and the second supply input of the second transistor;
- a third transistor, being connected with a third supply input to the first output of the first transistor, and having a third control input connected to the reference level and having a third output for providing a first amplified signal of the first input signal;
- a fourth transistor, being connected with a fourth supply input to the second output of the second transistor and having a fourth control input connected to the reference level, and having a fourth output for providing a second amplified signal of the second input signal;
- and
- a phase shifting element connected between the third output of the third transistor and the fourth output of the fourth transistor for combining the first amplified signal and the second amplified signal in-phase thus forming the output signal of the Doherty amplifier.
A method for manufacturing a Doherty amplifier having an input terminal for receiving an input signal, having an output terminal for providing an amplified signal of the input signal, having a first supply terminal for a first supply voltage, having a second supply terminal for a second supply voltage and having a reference terminal for a reference level, the method comprising the steps of:
- connecting the input terminal of the Doherty amplifier to a first input of a first phase shifting element;
- connecting a first output of the first phase shifting element to a first control input of a first transistor;
- connecting a first supply input of the first transistor to the second supply voltage terminal;
- connecting a second supply input of a second transistor to the negative supply voltage terminal;
- connecting a first output of the first transistor to a third supply input of a third transistor;
- connecting a second output of the second transistor to a fourth supply input of a fourth transistor;
- connecting the second output of the second transistor to the second supply input of the second transistor;
- connecting a third control input of the third transistor to the reference terminal;
- connecting a fourth control input of the fourth transistor to the reference terminal;
- connecting the fourth output of the fourth transistor to a second input of a second phase shifting element;
- connecting a second output of the second phase shifting element to the output terminal of the Doherty amplifier;
- connecting the fourth output of the fourth transistor to a first inductance terminal of a first inductance;
- and
- connecting a second inductance terminal of the first inductance to the first supply voltage terminal.
A computer program product comprising a non-transitory computer-usable medium having control logic stored therein for causing a computer to manufacture a Doherty amplifier having an input terminal for receiving an input signal and having an output terminal for providing an amplified signal of the input signal, the Doherty amplifier being supplied by a first supply voltage and a second supply voltage which have opposite polarities in respect to a reference level, the Doherty amplifier further comprising:
- a first transistor, having a first control input for receiving a first input signal derived from the input signal, having a first output, and having a first supply input connected to the second supply voltage;
- a second transistor, having a second control input for receiving a second input signal being derived from the input signal, having an output, and having a second supply input connected to the second supply voltage, wherein the phase of the first input signal and the phase of the second input signal differ by 90 degrees, and a constant current source is connected to the second output of the second transistor and the second supply input of the second transistor;
- a third transistor, being connected with a third supply input to the first output of the first transistor, and having a third control input connected to the reference level and having a third output for providing a first amplified signal of the first input signal;
- a fourth transistor, being connected with a fourth supply input to the second output of the second transistor and having a fourth control input connected to the reference level, and having a fourth output for providing a second amplified signal of the second input signal;
- and
- a phase shifting element connected between the third output of the third transistor and the fourth output of the fourth transistor for combining the first amplified signal and the second amplified signal in-phase thus forming the output signal of the Doherty amplifier.
Dependencies are inferred from the claim text.