Division by noninteger numbers using synchronous oscillators
AssigneeCommunications Satellite Corporation
InventorVasil Uzunoglu
Life of this patent
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Abstract
A synchronous oscillator is provided to divide the frequency of an input signal by a noninteger number, the noninteger number being expressed as the ratio of two whole integers X/Y. The oscillator is tuned to the desired output frequency, whereby every Yth cycle of the output signal is synchronized by every Xth cycle of the input signal at the negative (and possibly positive) peak of the output signal, thereby effecting a simultaneous multiplication and division of the input frequency of Y and X respectively. A pulse forming network provides the input signal in the form of pulses, whereby synchronization is effected at precise points in time. Pulse width and amplitude are adjustable to vary the input signal energy.
Claims25
An apparatus for dividing the frequency of a signal at a first frequency by a non-integer number comprising:
- a synchronous oscillator including a transistor having an input and an output, said signal at said first frequency being applied to said input;
- at least one transistor feedback path synchronizing said transistor input to said transistor output;
- and
- a tuned circuit coupled to at least a portion of said transistor feedback path to thereby provide said transistor with an output at a second frequency, the ratio of said first frequency to said second frequency being substantially equal to a non-integer value wherein said non-integer value is expressed as the ratio of two integers, X/Y, X and Y being integers;
- and
- said synchronous oscillator synchronizes every Yth cycle of said transistor output with every Xth cycle of said transistor input thereby effecting a simultaneous multiplication and division of said input frequency by Y and X respectively.
A frequency dividing circuit for dividing the frequency of an input signal by a non-integer number to produce a steady-state output signal comprising:
- a single synchronous oscillator receiving said input signal and providing said steady-state output signal in accordance with said non-integer number wherein said non-integer number is expressed as the ratio of two integers, X/Y, X and Y being integers;
- and
- said synchronous oscillator synchronizes every Yth cycle of said output signal with every Xth cycle of said input signal thereby effecting a simultaneous multiplication and division of said input frequency by Y and X respectively.
A method for dividing the frequency of an input signal by a non-integer number X/Y, X and Y being integers, to provide an output signal, the method comprising:
- applying said input signal to synchronous oscillator means;
- and
- synchronizing every Yth cycle of the output signal of said synchronous oscillator means with every Xth cycle of said input signal, thereby effectively simultaneously multiplying the frequency of said input signal by Y and dividing the frequency of said input signal by X at said synchronous oscillator means to produce said output signal.
Dependencies are inferred from the claim text.