Delay cell, delay locked look circuit, and phase locked loop circuit
First Claim
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1. A delay cell comprising:
- a first transistor having a first terminal connected to a power supply voltage terminal, a second terminal connected to an output terminal, and a gate terminal connected to an input terminal; and
a second transistor having a first terminal connected to a ground terminal, a second terminal connected to the output terminal, and a gate terminal connected to the input terminal,wherein each of the first and second transistors has a fully depleted silicon-on-insulator (FD-SOI) structure, and at least one of a first control voltage and a second control voltage is applied to at least one of bodies of the first transistor and the second transistors to adjust a delay time of the delay cell.
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Abstract
A delay cell includes a first transistor and a second transistor, at least one of which has a fully depleted silicon-on-insulator (FD-SOI) structure. A first control voltage is applied to the body of the first transistor and a second control voltage is applied to the body of the second transistors in order to adjust the delay time of the delay cell. DLL and PLL circuits includes this type of delay cell.
14 Citations
20 Claims
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1. A delay cell comprising:
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a first transistor having a first terminal connected to a power supply voltage terminal, a second terminal connected to an output terminal, and a gate terminal connected to an input terminal; and a second transistor having a first terminal connected to a ground terminal, a second terminal connected to the output terminal, and a gate terminal connected to the input terminal, wherein each of the first and second transistors has a fully depleted silicon-on-insulator (FD-SOI) structure, and at least one of a first control voltage and a second control voltage is applied to at least one of bodies of the first transistor and the second transistors to adjust a delay time of the delay cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A delay locked loop (DLL) circuit comprising:
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a delay circuit that receives a reference clock signal and includes series connected delay cells that applies a delay to the reference clock signal to generated a delayed buffered version of the reference clock signal; a phase detector that receive the reference clock signal and a feed-back clock signal and generates a first signal corresponding to a phase difference between the feed-back clock signal and the reference clock signal; and a control circuit that generates a first control signal that defines the delay applied to the reference clock signal in response to the first signal, wherein the first control signal is applied to a body of at least one of the transistors constituting at least one of the delay cells, the at least one of the transistors having a fully depleted silicon-on-insulator (FD-SOI) structure. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A phase locked loop (PLL) circuit comprising:
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a phase detector that receives a reference clock signal and a divided feed-back clock signal and generates a first signal corresponding to a phase difference between the divided feed-back clock signal and the reference clock signal; a control circuit that generates a first control signal that defines a delay applied to the reference clock signal in response to the first signal; a voltage controlled oscillator including delays cells and applying the delay to the reference clock signal to generate the feed-back clock signal; and a divider that receives the feed-back clock signal to generate the divided feed-back clock signal, wherein the first control signal is applied to a body of at least one of the transistors constituting at least one of the delay cells, the at least one of the transistors having a fully depleted silicon-on-insulator (FD-SOI) structure. - View Dependent Claims (17, 18, 19, 20)
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Specification