Siemens Aktiengesellschaft

Infineon Technologies Ag

Walter Zimmermann

Reinhard Losehand

Gerhard Lohninger

Erwin Krug

Raimund Peichl

Karl Platzoeder

Horst Klein

An amplifier having programmable amplification includes a transistor circuit having a plurality of negative feedback resistors, a switch being associated to a negative feedback resistor such that the negative feedback resistors of the transistor circuit can be activated and deactivated selectively by operating switches via a controller. Thus, a broadband amplifier having a high linearity can be implemented.

Amplifier having switchable negative feedback

A mixer includes two transistor circuits, two control inputs, two RF inputs and two IF outputs, wherein, for switch-support, there are provided positive feedback elements and impedance elements, by which intermodulation strength, stability and noise performance of the mixer circuit are improved.

Mixer circuit with phase-shifted radio frequency signal

An integrated component for radiofrequency applications has a resonant circuit with tuning diodes and trimming diodes that are connected in parallel. A programmable conductor network generates a trimming voltage at a trimming input that enables the production of a specific relationship between a voltage present at a tuning input and the resonant frequency of the resonant circuit.

Integrated radiofrequency circuit component having a trimming diode controlled by a trimming voltage provided by a D/A converter

A Doppler radar module constructed using micro-stripline technology is used in motion sensors and includes a local oscillator stabilized with a dielectric resonator that feeds a microwave antenna via a mixer that is connected in series. The transmission signal is emitted from the microwave antenna and is reflected back from an object where it is received by the antenna and forwarded to the mixer. The mixer mixes the reflected signal with a portion of the oscillator signal to form a Doppler signal.

Doppler radar module using micro-stripline technology

An arrangement for frequency conversion of an input signal having a frequency f.sub.1 with an oscillator signal having a frequency f.sub.2 to form an intermediate frequency signal of frequency f.sub.3 has a high intermodulation steadiness given a simultaneously low power consumption. A switch element is switched high-impedance and low-impedance parallel to a signal-carrying path with a control source having the oscillator frequency f.sub.2. Circuits are inserted into the signal infeed and signal outfeed paths and have transmission properties for the frequency f.sub.1 and blockage properties for the frequency f.sub.3 in the infeed path, as well as transmission for the frequency f.sub.3 and blockage for the frequency f.sub.1 in the outfeed path.

Arrangement for frequency conversion of an input signal with an

A chip carrier for a microwave semiconductor component with four external electrical contacts has a favorable operating and application behavior, even when a plastic housing is used. Two external source terminals are connected with each other as one pieve via a cross member. The cross member basically proceeds obliquely to a transverse axis or to a longitudinal axis of the chip carrier.

Chip carrier for a microwave semiconductor component

A measuring mount for microwave components provides very high precision measuring of microwave components that include automatic units. The measuring mount has a slide for introducing the component 30 being measured into the measuring mount and for positioning and contacting the component 30 which is to be measured in the measuring mount. The slide provides that good electrical contact will be made with the component so as to assure that the measured characteristics will be accurate.

Measuring mount for microwave components

In a chip carrier for microwave components with an electrically conductive support and with a dielectric substrate, the electrical leads should be able to be impedance-matched in a simple manner. Such a chip carrier should be easy to insert in a microwave circuit and should have a simple construction. A recess (3) in the dielectric substrate (1) is in shape and size to the microwave component(s) to be mounted. The dielectric substrate (1) rests on the electrically conductive support (2). At least one microwave semiconductor component (4) is inserted in the recess (3) of the dielectric substrate (1). The ground terminals (11) of the microwave semiconductor component (4) are connected with the support (2) inside the recess (3). In the connection surface between the dielectric substrate (1) and support (2), the substrate (1) protrudes beyond the support (2). Where the substrate (1) protrudes beyond the support (2), the microwave strip lines (5) applied on the upper surface of the substrate (1) have thickened sections (6) for electrical connection to other materials.

Characteristic impedance-correct chip carrier for microwave

A circuit for generating a gate bias for field effect transistors in which one or several field effect transistor(s), identical within certain tolerances are paralleled and have a channel current above a predetermined value, is (are) connected to one or more electrically operated light sources so that at least a part of the channel current operates the light sources which radiate light. The light is received in a photocell and is converted to a dc voltage fed directly or indirectly to the gate(s) of the field effect transistor(s) in such a manner that the gate voltage thus supplied counteracts the channel current, and that an electrical device for the adjustment of the channel current is provided. The device described is especially well suited for application in microwave technology.

Growing community of inventors

Dorfen, Germany

Walter Zimmermann