Motorola Corporation

General Instrument Corporation

Brian Carroll

David E Zeidler

Steven Corso

A frequency range bounder for limiting the frequency of a voltage controlled oscillator uses a multiplexer that responds to comparator inputs indicating whether an input control signal will allow the oscillator frequency to go beyond a predetermined range. If the control signal keeps the frequency within the range, the control signal is sent directly to an oscillator driver. If the control signal is above or below the range, the multiplexer outputs an alternative value as the control signal. As a result, the oscillator frequency is prevented from extending beyond an allowable tolerance range.

Frequency bounded oscillator for video reconstruction

A circuit connected between an audio signal receiver and an audio output unit can prevent an audio pop from being emitted by a speaker associated with the audio output unit. The circuit interrupts the output of the signal receiver when the DC voltage level of the system suddenly changes, e.g. when a different audio signal is selected or when the receiver is powered on or off. The output of the receiver is shunted through a resistor to ground until a blocking capacitor between the receiver and audio output unit can charge to the new DC voltage level.

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Brian Carroll