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US 10,707,855 B2Granted
Pulse modulation circuit with high-frequency-limiting function
AssigneeChongqing Passion Chuangzhi Microelectronics Co., Ltd.
InventorFang Tang
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Abstract
A pulse modulation circuit with a high-frequency-limiting function, including a comparator, an RS trigger, a switching triode, a NAND gate, a NOR gate, and a charging capacitor. A capacitor charging time is controlled by adjusting a bias current IB1, a bias current IB2, a reference voltage V1, and a reference voltage V2 or adjusting values of capacitors C1 and C2. In this way, a highest output frequency of a pulse generator is limited, so as to reduce hardware system overheads.
Claims5
A pulse modulation circuit with a high-frequency-limiting function,
- comprising:
- a first level output unit, a second level output unit, a third voltage comparator, an RS trigger, a NAND gate, and a NOR gate, wherein
- an output terminal of the first level output unit is connected to a first input terminal of the RS trigger and a first input terminal of the NOR gate, and an input terminal of the first level output unit is connected to a first output terminal of the RS trigger;
- an output terminal of the second level output unit is connected to a first input terminal of the NAND gate, and an input terminal of the second level output unit is connected to a second output terminal of the RS trigger and a voltage pulse frequency output terminal;
- and a second input terminal of the NAND gate is connected to an output terminal of the third voltage comparator, and an output terminal of the NAND gate is connected to a second input terminal of the NOR gate;
- and
- two input terminals of the third voltage comparator are connected to a first periodic input signal and a first reference signal, respectively.
4 more elements
Dependencies are inferred from the claim text.