Positive and negative voltage sampling switching circuit and voltage sampling circuit
A sampling switch, positive and negative voltage technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of reduced circuit performance, complex circuit structure, small voltage signal range, etc., to widen the scope, expand application occasions, circuit simple structure
Active Publication Date: 2014-07-16
CHIPSEA TECH SHENZHEN CO LTD
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Problems solved by technology
[0003] However, the existing positive and negative voltage sampling switch circuits have complex circuit structures and a small range of voltage signals that can be sampled. For example, according to the design of the positive and negative voltage sampling switch circuits proposed in the patent No. Assuming that the threshold voltage of the PMOS transistor in the circuit is 1V, then in the case of a 5V single power supply, the input voltage signal range allowed by the circuit is about -3V to +1V, that is, the sampled voltage signal range of the circuit It is -3V to +1V, and for input voltages beyond this voltage range, the performance of the circuit will decrease sharply until the sampling switch function of the circuit fails, which limits the application of the positive and negative voltage sampling switching circuit
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[0027] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] refer to figure 1 , figure 1 It is a schematic circuit diagram of a preferred embodiment of the positive and negative voltage sampling switch circuit of the present invention. The positive and negative voltage sampling switch circuit of the present invention includes a voltage signal input terminal 1, a voltage signal output terminal 2, a voltage follower 3, a PMOS transistor 4, a sampling clock generation circuit 5, a switch SW and a capacitor C.
[0029] Wherein, the sampling clock generating circuit 5 includes a first sampling clock signal output terminal and a second sampling clock signal output terminal, wherein the first sampling clock signal output ter...
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The invention discloses a positive and negative voltage sampling switching circuit and a voltage sampling circuit. The positive and negative voltage sampling switching circuit comprises a voltage signal input terminal, a voltage signal output terminal, a voltage follower, a PMOS (P-channel Metal Oxide Semiconductor) transistor, a sampling clock generating circuit, a switch and a capacitor, wherein the voltage follower is used for generating a voltage signal related to the voltage signal input by the voltage signal input terminal at a non-sampling moment, the sampling clock generating circuit is used for generating an appropriate sampling clock to control the on and off of the switch and the control voltage at one end of the capacitor; the capacitor is used for storing the voltage signal generated by the voltage follower and generating an appropriate PMOS transistor grid voltage to control the PMOS transistor to be conducted; and the PMOS transistor is used for conveying the voltage signal at the voltage signal input terminal to the voltage signal output terminal to be sampled. By adopting the positive and negative voltage sampling switching circuit disclosed by the invention, the range of a sampled positive and negative voltage signal is expanded, and the positive and negative voltage sampling switching circuit also has the advantage of simple circuit structure.
Description
technical field [0001] The invention relates to the technical field of voltage sampling, in particular to a positive and negative voltage sampling switch circuit and a voltage sampling circuit. Background technique [0002] In many applications of integrated chips, the voltage signal that needs to be sampled may have both positive and negative voltage signals, and the chip's own working power supply has only a single power supply (only positive power supply and no negative power supply). Therefore, the existing Many positive and negative voltage sampling switch circuits that can sample positive voltage signals and negative voltage signals have been born in the technology. Among them, the typical positive and negative voltage sampling switch circuits use PMOS tubes as switch tubes, and then cooperate with appropriate PMOS tubes. The gate voltage control circuit realizes the function of positive and negative voltage sampling. [0003] However, the existing positive and negati...
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IPC IPC(8): H02M3/07
Inventor 万巍
Owner CHIPSEA TECH SHENZHEN CO LTD