Temic Telefunken Microelectronic Gmbh

Telefunken Electronic Gmbh

Atmel Automotive Gmbh

Hans Sapotta

Heinz Rinderle

Andreas Leistner

Herman Jalli Ng

A mixer stage is provided that includes an oscillator, a first input, a second input, a first output, a second output, a set of four controllable amplifier elements, and a first current source. The mixer stage further includes at least one second current source in addition to the first current source, the first current source and the at least one second current source can each be switched on and off by an associated switching input that is connected to an associated oscillator output. Pairs of amplifier elements of the set of four together with at least one of the at least two current sources in its switched-on state form a differential amplifier for an input signal present at the first input and the second input. A method for mixing frequencies is also provided.

Mixer stage and method for mixing two signals having different frequencies

HF mixer for changing the frequency of an alternating voltage input signal at the circuit input to an output signal supplied at the circuit output, with an input signal source for generating the alternating voltage input signal and a local oscillator for providing a heterodyne signal. The mixing stage has two transistors complementary to one another, and connected as base grounded circuits or gate grounded circuits, connected in parallel for the alternating voltage input signal. The two transistors are connected to the local oscillator in such a way that they are equidirectionally driven by the heterodyne signal, so that both transistors change simultaneously to the blocked or conductive state.

Additive HF mixer

HF mixing stage in the form of a common-base circuit including: two bipolar amplifying transistors; two switching stages each assigned to an amplifying transistor and each having two emitter-coupled bipolar switching transistors and with two signal sources which supply the bases of the switching transistors with superimposed signals; two nodes at which the emitters of the switching transistors are connected to the collector of the associated amplifying transistor; two further output nodes at which the collectors of each of two switching transistors in different switching stages are connected together; circuit elements for electrical isolation through which the emitters of the amplifying transistors are connected together; an input signal source with associated internal resistor of which the one terminal is connected via the circuit input to the circuit elements for electrical isolation and the other terminal is connected to reference potential and whose signal is to be transposed into another frequency range through the mixing stage; and wherein: the two bipolar amplifying transistors are of different conduction type, and the two switching transistors of a respective switching stage are of the same conduction type as the associated bipolar amplifying transistor.

HF mixing stage in the form of a common-base circuit

An HF mixer stage having a common base circuit comprises an amplifier stage having two amplifier transistors, a switching stage with two transistor pairs each having two emitter-coupled switching transistors, and a switching circuit connected to the switching transistors; the switching transistors of a transistor pair are connected to the collector of the associated amplifier transistor, the bases of the switching transistors are subjected to a heterodyne signal. In accordance with the invention, the two amplifier transistors are of the opposite conductivity type, the emitters of the amplifier transistors are connected to the circuit input, and the two switching transistors of a transistor pair are of the same conductivity type as the associated amplifier transistors.

HF mixer stage having a common base circuit

An amplifier stage for use with low-resistance AC voltage sources has first and second complimentary transistors, each having a control terminal, a current input terminal and a current output terminal. The transistors are connected together at a first junction point, a current terminal of the second complementary transistor being connected at the first junction point to a corresponding current terminal of the first complimentary transistor. The respective other corresponding current terminals of the transistors are connected to respective opposite poles of a direct current supply, so that the first transistor, the second transistor, and the direct current supply form a series connection providing a common quiescent current to the transistors. The transistors are each provided with a respective separate direct current operating voltage at a respective control terminal. The transistors are connected to receive an input AC voltage at respective corresponding current input terminals, thereby receiving the input AC voltage in parallel.

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Heilbronn, Germany

Hans Sapotta