Abstract: In the case of a voltage-controlled LC oscillator (4), the effects of supply voltage fluctuations are reduced according to the invention, due to the fact that a stabilized voltage source (3) is assigned to the LC oscillator (4), which supplies the LC oscillator (4) with a stabilized voltage. This in particular is the case if the LC oscillator (4) is integrated together with other circuit components in a semiconductor and heavy noise or strong disturbances occur on supply voltage lines (1, 2). Advantageously, the stabilized voltage source (3) is formed by an operational amplifier (6), after which a driver transistor (5) is positioned, whereby the operational amplifier is subjected to a reference voltage (7).

Abstract: A circuit for the glitch-free changeover between digital signals includes a multiplexer having a multiplicity of signal input terminals, signal select terminals and a signal output terminal. Furthermore, the circuit includes a counter logic unit for counting pulses in the output signal of the multiplexer and for outputting a count signal when a specific count value is reached. A delay logic unit delays a multiplexer select signal and outputs a switching signal and a delayed multiplexer select signal. During a set switching signal the counter logic unit is activated and the circuit output is deactivated.