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US 8,045,950 B2Granted
Mixer circuit, receiving circuit, transmitting circuit, and method for operating a mixer circuit
AssigneeAtmel Corporation
InventorUdo Karthaus
Life of this patent
Estimating the term…
Abstract
A mixing circuit is provided that includes a charge circuit, an oscillating circuit inlet step which is connected to a circuit which feeds an oscillating signal, and a signal inlet step. The oscillating circuit inlet step comprises at least two bipolar-transistors and the emitters thereof are connected to a constant potential which is independent from the oscillating signal. The mixing circuit is used, preferably, in a base station or a mobile radio device of a cellular radio network.
Claims15
A mixer circuit comprising:
- a load circuit;
- an oscillator circuit input stage that is operatively connected to a circuit that generates an oscillating signal;
- and
- a signal input stage configured to receive an input signal to be mixed with the oscillating signal,
- wherein the oscillator circuit input stage has at least two bipolar transistors, whose bases are operatively connected to the circuit emitting the oscillating signal, whose emitters are operatively connected to a constant voltage that is independent of the oscillating signal, and
- wherein the circuit is configured to temporarily turn off a current to the mixer circuit by switching off both of the two bipolar transistors based on the oscillating signal.
3 more elements
A mixer circuit comprising:
- a load circuit;
- an oscillator circuit input stage, which is operatively connected to a circuit that generates an oscillating signal;
- and
- a signal input stage configured to receive an input signal to be mixed with the oscillating signal;
- wherein the oscillator circuit input stage has at least two field-effect transistors whose gate connections are operatively connected to the circuit emitting the oscillating signal, whose source connections are connected to a constant voltage that is independent of the oscillating signal, and
- wherein the circuit is configured to temporarily turn off a current to the mixer circuit by switching off both of the two field-effect transistors based on the oscillating signal.
3 more elements
A transmitting circuit comprising:
- a mixer circuit, the mixer circuit comprising:
- a load circuit;
- an oscillator circuit input stage that is operatively connected to a circuit that generates an oscillating signal, the circuit temporarily turning off a current to the mixer circuit in dependence of the oscillator signal;
- and a signal input stage configured to receive an input signal to be mixed,
- wherein the oscillator circuit input stage has at least two transistors that are operatively connected to the circuit emitting the oscillating signal, whose emitters are operatively connected to a constant voltage that is independent of the oscillating signal, and
- wherein the circuit emitting the oscillating signal is designed to turn on the two transistors of the oscillator circuit input stage in a time-offset manner as a function of the oscillating signal.
3 more elements
Dependencies are inferred from the claim text.