Abstract:
A circuit arrangement comprises an amplifier with a bipolar transistor (T1) whose base terminal is connected to the input terminal (HFin) for a signal to be amplified. A bias device for setting a potential (UbeT1) is provided on the base terminal of the biotransistor (T1). Additionally provided is a device (32) for supplying a current to the base terminal of the biotransistor (T1) such that a charging or discharging current to the input terminal (HFin) is greater than a base current of the biotransistor (T1). The circuit arrangement also comprises a device (30) for detecting whether a change in potential on the base terminal of the biotransistor (T1) should ensue in order to switch over the biotransistor, and comprises a device (30) for switching on the device for supplying the current to the basis of the bipolar transistor (T1) when a change in potential on the base terminal of the biotransistor (T1) should ensue.
Abstract:
Verstärkerschaltung mit: einem Verstärker-Eingang (13); einem Verstärker-Ausgang (19); einer Kaskoden-Schaltung, die einen Eingangs-Transistor (9) und einen Ausgangs-Transistor (15) aufweist, wobei der Verstärker-Eingang (13) mit einem Transistor-Steuer-Anschluss des Eingangs-Transistors (9) und der Verstärker-Ausgang (19) mit einem ersten Transistor-Anschluss des Ausgangs-Transistors (15) gekoppelt ist; einem Rückkopplungspfad zwischen einem Transistor-Steuer-Anschluss des Ausgangs-Transistors (15) und dem ersten Transistor-Anschluss des Ausgangs-Transistors (15), wobei eine Einrichtung mit variabler Impedanz (37, 39) in den Rückkopplungspfad geschaltet ist, deren Impedanz derart von einer Temperatur abhängt, dass eine Variation der Verstärkung abhängig von der Temperatur reduziert ist; wobei die Einrichtung mit variabler Impedanz eine veränderliche Blindimpedanz aufweist; und wobei die Verstärkerschaltung ausgelegt ist, um die veränderliche Blindimpedanz in Abhängigkeit von der Temperatur einzustellen.
Abstract:
The system has a distant area-radar (9) for recognition of distant objects e.g. land or water vehicle. A park assisting system is provided for detection of objects in a close environment of a vehicle. An operation control device is provided for controlling the operation of the radar in dependent of the movement state of the vehicle. The operation control device is configured to deactivate the radar, when the vehicle is found in a stopping condition and to switch the radar in an emission free stand-by-mode and to activate the park assisting system, simultaneously.
Abstract:
An amplifier circuit has a control terminal for adjusting amplification of the amplifier circuit, and a feedback path between the amplifier output (19) and the control terminal, in which a device of variance impedance is connected in a feedback. The impedance depends on the temperature such that a variation of amplification dependent on the temperature is reduced.
Abstract:
Eine Hochfrequenz-Vorrichtung umfasst ein Halbleiterpackage, welches einen Hochfrequenz-Chip und eine Hochfrequenz-Antenne umfasst. Das Halbleiterpackage ist dazu ausgelegt, über zumindest ein Verbindungselement des Halbleiterpackage mechanisch und elektrisch mit einer Platine verbunden zu werden, wobei eine Oberfläche des Halbleiterpackage der Platine zugewandt ist. Die Hochfrequenz-Vorrichtung umfasst ferner eine Hohlleiterstruktur, die in einer Richtung parallel zu der Oberfläche des Halbleiterpackage ausgerichtet ist, wobei die Hochfrequenz-Antenne für zumindest eines von folgendem ausgelegt ist: in der Richtung parallel zu der Oberfläche des Halbleiterpackage in die Hohlleiterstruktur einzustrahlen, oder in der Richtung parallel zu der Oberfläche des Halbleiterpackage über die Hohlleiterstruktur Signale zu empfangen.
Abstract:
The supply circuit [1] for use with a transistor linear amplifier has a power source [11], a current generator [21], a mirror transistor [31], lineariser [41], control impedance [51], output impedance [61] cross impedance [71] and control output [81]. The output is connected to the transistor amplifier circuit [101]. The lineariser provides an output to increase the amplification based on a comparison.
Abstract:
The radar system (MRR) has an antenna connected with a high frequency transmitting/receiving circuit (120) of a high frequency transmitting module. A controlling and processing unit (110) provides control signals (CF0, CF1) that are supplied to the high frequency transmitting module, where operating modes of the radar system are adjustable with the aid of the control signals. An oscillator is tunable into a frequency range containing one of frequencies of two frequency spectrums, with the aid of a control voltage.
Abstract:
A circuitry comprises an amplifier with a bipolar transistor, whose base terminal is coupled to an input terminal for a signal to be amplified. A biasing means for setting a potential at the base terminal of the bipolar transistor is provided. Further, a means for providing such a current to the base terminal of the bipolar transistor is provided, so that a charging or discharging current to the input terminal is larger than a base current of the bipolar transistor. Further, the circuitry comprises a means for detecting whether a potential change at the base terminal of the bipolar transistor is to be effected for switching the bipolar transistor, and a means for connecting the means for providing the current to the base of the bipolar transistor when a potential change is to be effected at the base terminal of the bipolar transistor.