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US 7,680,238 B2Granted
Frequency divider circuit
AssigneeAdvanced Analog Technology, Inc.
InventorHeng Li Lin
Life of this patent
Estimating the term…
Abstract
A frequency divider circuit comprises a plurality of T flip-flops, a first transmission gate, a second transmission gate and an inverter. The plurality of T flip-flops is connected in series. The output of the inverter is connected to a clock input of a first T flip-flop. The first transmission gate connects a clock signal and the other clock input of the first T flip-flop and the input of the inverter. The second transmission gate connects the inverted signal of the clock signal and the output of the first transmission gate.
Claims5
A frequency divider circuit comprising:
- a plurality of T flip-flops connected in series, wherein one of the output terminals of each T flip-flop is connected to one of the clock terminals of the following T flip-flop, the other output terminal of each T flip-flop is connected to the other clock terminal of the following T flip-flop, and the toggle terminal of each T flip-flop is connected to logic 1;
- an inverter with its output terminal connected to one of the clock terminals of a first T flip-flop;
- a first transmission gate connecting a clock signal to the other clock terminal of the first T flip-flop and the input terminal of the inverter;
- and
- a second transmission gate connecting the inverted signal of the clock signal to the other clock terminal of the first T flip-flop and the input terminal of the inverter;
- wherein a last T flip-flop controls the first transmission gate and the second transmission gate.
3 more elements
A frequency divider circuit comprising:
- a plurality of T flip-flops connected in series;
- and
- a transmission gate circuit connecting a clock signal and the inverted signal thereof to clock terminals of a first T flip-flop;
- wherein the number of logic transitions of each T flip-flop is twice as many as that of the following T flip-flop;
- wherein when the output logic of a last T flip-flop changes, the transmission gate circuit inverts its output signals.
2 more elements
Dependencies are inferred from the claim text.