Abstract: A power-supply arrangement comprises a reference circuit for generating a reference voltage (Vref). The reference circuit is coupled between a first (1) and a second (2) supply voltage terminal for receiving a supply voltage. A stabilizing circuit (4) generates a stabilization voltage (Vstab) related to the reference voltage and has an input terminal for receiving the reference voltage, a common terminal (7), and an output terminal for supplying the stabilization voltage. A switching stage (10) is switched depending on the supply voltage and comprises at least one switching element coupled between the input terminal and the common terminal. A current source is switched depending on the supply voltage and is coupled between the second supply voltage terminal and the common terminal. A capacitor is coupled between the common terminal and the first supply voltage terminal, and a buffer stage is coupled between the common terminal and the output terminal.

Abstract: In a series-regulation transistor (T.sub.1), which is driven by a drive circuit (10), for generating a constant voltage across a load (R.sub.L) the occurrence of comparatively large substrate currents in the case of saturation of the series-regulation transistor (T.sub.1) is precluded by a limiting circuit comprising a resistor (R.sub.1) arranged in the base line of the series-regulation transistor (T.sub.1) and a second transistor (T.sub.2) whose base-emitter junction is arranged across the resistor (R.sub.1) and the base-collector junction of the series-regulation transistor (T.sub.1). The collector of the second transistor is connected to a control input (12) of the drive circuit.

Abstract: Receiver (1-9) provided with a frequency control loop (2-6) for automatic fine tuning, consecutively incorporating a controllable oscillator (6) which is tunable in frequency by means of a variable capacitance diode (D), a mixer stage (2) to which the signal from the controllable oscillator (6) is applied for converting an RF receiver signal into an intermediate frequency signal, a frequency voltage converter (4) tuned to a fixed intermediate frequency for converting frequency deviations of the intermediate frequency signal relative to the fixed intermediate frequency into amplitude variations of the frequency voltage converter (4) output signal relative to a refrence value, a control signal generating circuit (5) for deriving a control signal for the variable capacitance diode (D) of the controllable oscillator (6) from the output signal of the frequency voltage converter (4), which at least partly compensates the asymmetrical diode capacitance-voltage characteristic.