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US 3,943,379 AGranted
Symmetrical odd modulus frequency divider
AssigneeRCA Corporation
InventorWilliam George McGuffin
Life of this patent
Estimating the term…
Abstract
Logic circuit for dividing an input frequency symmetrically by an odd number without producing spurious transients.
Claims3
A circuit for symmetrically dividing by an odd modulus m comprising
- n flip-flop means for storing signals,
- where n = (m+3)/2;
- a source of input pulses to be divided;
- complementing means for complementing said input pulses;
- first coupling means for controlling the first (n - 1) flip-flop means with said input pulses;
- second coupling means for controlling the nth flip-flop means with said complemented input pulses;
- means for coupling the signal stored in the i-th flip-flop means to the j-th flip-flop means for storage, where i = 1, 2, . . . , n-1 and j = 2, 3, . . . , n;
- first gating means responsive to the signals stored in the (n-1)th and (n-2)th flip-flop means for producing a signal which is stored in the first flip-flop means by each input pulse;
- and
- second gating means responsive to the signals stored in the nth and (n-1)th flip-flop means for producing an output signal.
7 more elements
A logic circuit for symmetrically dividing an input signal by three comprising the combination:
- source of input signals to be divided;
- first and second flip-flop means responsive to the input signals for storing a signal between input signals equivalent to the value of an applied second signal at the leading edge of the input signal;
- third flip-flop means responsive to a 180.degree. phase shift of the input signal for storing a signal between shifted input signals equivalent to the value of an applied second signal at the leading edge of the shifted input signal;
- means for coupling the stored signal in said first flip-flop means as the applied second signal to said second flip-flop means;
- means for coupling the stored signal in said second flip-flop means as the applied second signal to said third flip-flop means;
- first gating means responsive to the stored signals of said first and second flip-flop means for providing an applied second signal to said first flip-flop means;
- and
- second gating means responsive to the signals stored in said second and third flip-flop means for producing an output signal.
5 more elements
Dependencies are inferred from the claim text.