A temperature controlled attenuator circuit is disclosed. The temperature controlled attenuator circuit comprises a temperature sensor circuit for sensing the temperature of an electronic component and generating a control voltage inversely proportional to a difference in temperature between an ambient temperature and the temperature of the electronic component and a variable attenuator circuit configured to vary its attenuation based upon the control voltage to provide an attenuation based upon the difference in temperature between the ambient temperature and the temperature of the electronic component. A radio frequency module and wireless device comprising said temperature controlled attenuator circuit are also provided.

A temperature controlled attenuator circuit is disclosed. The temperature controlled attenuator circuit comprises a temperature sensor circuit for sensing the temperature of an electronic component and generating a control voltage inversely proportional to a difference in temperature between an ambient temperature and the temperature of the electronic component and a variable attenuator circuit configured to vary its attenuation based upon the control voltage to provide an attenuation based upon the difference in temperature between the ambient temperature and the temperature of the electronic component. A radio frequency module and wireless device comprising said temperature controlled attenuator circuit are also provided.

A programmable voltage variable attenuator (VVA) that enables selection among multiple analog, continuous attenuation ranges. Some embodiments include a dual-mode interface to enable digitally programming a DAC and provide the analog output to control the attenuation level of the VVA, or alternatively apply an externally provided analog voltage to directly control the VVA attenuation level. A VVA may be used in conjunction with a digital step attenuator (DSA). Some embodiments include circuitry for changing the VVA reference impedance. The attenuator architecture of the VVA includes one or more variable resistance shunt elements and/or series elements which may be a resistor and FET circuit controlled by a provided variable analog voltage. The multiple resistance element architecture may be implemented with stacked FET devices. Embodiments for the VVA may be based, for example, on T-type, Bridged-T type, Pi-type, L-pad type, reflection type, or balanced coupler type attenuators.

A resistive component in a hybrid microwave attenuator circuit is configured to attenuate a plurality of frequencies in an input signal. The hybrid microwave attenuator circuit is further configured with a dispersive component to attenuate a second plurality of frequencies within a frequency range by reflecting off portions of the input signal at those frequencies that are within the frequency range. The resistive component and the dispersive component are arranged in a series configuration relative to one another in the hybrid microwave attenuator circuit.

A resistive component in a hybrid microwave attenuator circuit is configured to attenuate a plurality of frequencies in an input signal. The hybrid microwave attenuator circuit is further configured with a dispersive component to attenuate a second plurality of frequencies within a frequency range by reflecting off portions of the input signal at those frequencies that are within the frequency range. The resistive component and the dispersive component are arranged in a series configuration relative to one another in the hybrid microwave attenuator circuit.

A reflection attenuation device for a bus of a bus system and a method for attenuating reflections during a data transfer in a bus system. The reflection attenuation device may close off a free end of bus lines of the bus in a transceiver device of a user station of the bus system. Alternatively, the reflection attenuation device may be connected to a branch point of the bus which is a star point or is used to connect a user station to the bus. Thus, bus users in a vehicle trailer are also connectable to the bus system of the vehicle, as needed. The reflection attenuation device includes at least one pair of electrical semiconductor components connected in parallel, and at least one capacitor that is connected in series to the pair of electrical semiconductor components connected in parallel, for attenuating reflections on a bus line of the bus.

A reflection attenuation device for a bus of a bus system and a method for attenuating reflections during a data transfer in a bus system. The reflection attenuation device may close off a free end of bus lines of the bus in a transceiver device of a user station of the bus system. Alternatively, the reflection attenuation device may be connected to a branch point of the bus which is a star point or is used to connect a user station to the bus. Thus, bus users in a vehicle trailer are also connectable to the bus system of the vehicle, as needed. The reflection attenuation device includes at least one pair of electrical semiconductor components connected in parallel, and at least one capacitor that is connected in series to the pair of electrical semiconductor components connected in parallel, for attenuating reflections on a bus line of the bus.

A temperature sensor circuit for sensing the temperature of an electronic component is disclosed. The temperature sensor circuit comprises a first transistor configured to be thermally isolated from the electronic component and being configured to sense an ambient temperature and a second transistor configured to be thermally linked to the electronic component and being configured to sense a temperature at the electronic component. The temperature sensor circuit is a differential circuit having a first path and a second path with the first and second transistors being arranged on the first and second paths of the differential circuit, respectively, such that the temperature sensor circuit generates an output voltage inversely proportional to a temperature difference between the ambient temperature and the temperature at the electronic component. The temperature sensor circuit also comprises a shut-off switch configured to activate or deactivate the temperature sensor circuit.

A variable attenuator circuit is disclosed. The variable attenuator circuit comprises a plurality of varactor diodes configured to attenuate an RF signal between an RF input and an RF output; a reference voltage input, and a control voltage input configured to vary the attenuation of the variable attenuator circuit based upon a control voltage. A radio frequency module and wireless device comprising said variable attenuator are also provided.

A variable attenuator circuit is disclosed. The variable attenuator circuit comprises a plurality of varactor diodes configured to attenuate an RF signal between an RF input and an RF output; a reference voltage input, and a control voltage input configured to vary the attenuation of the variable attenuator circuit based upon a control voltage. A radio frequency module and wireless device comprising said variable attenuator are also provided.