Differential amplifier and radio system with a differential amplifier
AssigneeATMEL Germany GmbH
InventorWolfram Kluge
Life of this patent
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Abstract
A radio system for communication is provided that has a differential amplifier for amplifying a transmission frequency, particularly 2.4 GHz, wherein the differential amplifier has a first inductor, which is magnetically coupled to a second inductor, and a capacitor. The capacitor, the first inductor, and the second inductor are wired into a resonant circuit in such a way that the resonant circuit has a common-mode impedance for a common-mode signal and a push-pull impedance, different from the common-mode impedance, for the push-pull signal.
Claims21
A differential amplifier comprising:
- a first input;
- a second input;
- a first transistor;
- a second transistor;
- a first inductor that is magnetically coupled to a second inductor;
- and
- a capacitor,
- wherein the capacitor, the first inductor, and the second inductor are wired into a resonant circuit so that the resonant circuit provides a common-mode impedance when a common-mode signal is applied to said first and second input and a push-pull impedance, which is different than the common-mode impedance, when a push-pull signal is applied to said first and second input, and
- wherein a first source terminal or a first emitter terminal of the first transistor is connected to a first input of the differential amplifier, and wherein a second source terminal or a second emitter terminal of the second transistor is connected to a second input of the differential amplifier.
A differential amplifier comprising:
- a first transistor;
- a second transistor;
- a first inductor that is magnetically coupled to a second inductor;
- and
- a capacitor,
- wherein the capacitor, the first inductor, and the second inductor are wired into a resonant circuit so that the resonant circuit has a common-mode impedance for a common-mode signal and a push-pull impedance, which is different than the common-mode impedance, for a push-pull signal,
- wherein the resonant circuit is connected to the first transistor and to the second transistor so that the resonant circuit forms a symmetric load for the first transistor and for the second transistor, and
- wherein a first source terminal or a first emitter terminal of the first transistor is connected to a first input of the differential amplifier, and wherein a second source terminal or a second emitter terminal of the second transistor is connected to a second input of the differential amplifier.
The differential amplifier according to any 12, further comprising an additional resonant circuit that is a load for the second amplifier stage, wherein the additional resonant circuit is connected to the third transistor and the fourth transistor or to the fifth transistor and the sixth transistor to form the second amplifier stage.
A radio system for communication, comprising a differential amplifier for amplifying a transmission frequency, the differential amplifier comprising:
- a first input;
- a second input;
- a first inductor that is magnetically coupled to a second inductor;
- and
- a capacitor,
- wherein the capacitor, the first inductor, and the second inductor are wired into a resonant circuit so that the resonant circuit provides a common-mode impedance when a common-mode signal is applied to said first and second input and a push-pull impedance, which is different than the common-mode impedance, when a push-pull signal is applied to said first and second input.
Dependencies are inferred from the claim text.