Switch device and multi-channel coupling selector with the switch device

Abstract

The invention discloses a switching device which is applied to a CMOS device. The switching device comprises a first-stage switch, a second-stage switch, a third-stage switch and a CLK / CLKB clock, wherein the second-stage switch is connected with the first-stage switch and comprises a transmission tube and a dual switch structure connected with the transmission tube, and the dual switch structure is used for controlling on-off of the transmission tube; the third-stage switch is connected with the second-stage switch; and the CLK / CLKB clock is connected with the first-stage switch, the second-stage switch and the third-stage switch. The invention further discloses a multichannel coupling selector which comprises N signal selecting channels. The signal selecting channel comprises an AND gate, an inverter connected with the output end of the AND gate, and the switching device disclosed in the claim 1-11. The switching device disclosed by the invention can realize good signal transmission control at a low cost, and can effectively resist interstage signal crosstalk of the multichannel coupling selector and interferences of noise signals at the same time.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a switch device and a multi-channel coupling selector with the switch device. Background technique [0002] The existing traditional CMOS transmission gate switch is to connect n-channel MOSFET (M1’) and p-channel MOSFET (M2’) in parallel, such as figure 1 As shown, the signal can pass equally smoothly in both directions. The amount of signal current carried between n-channel and p-channel devices is determined by the ratio of input to output voltages. Since the switch does not have a selection problem for the current flow, there is no strict distinction between the input end and the output end. When the CLK clock signal is at a high level (the CLKB clock signal is at a low level), M1' and M2' are turned on, and VOUT=VIN. On the contrary, M1', M2' cut off, which is equivalent to a large resistance. [0003] If this switch is used in the selector, the input s...

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Problems solved by technology

[0007] In view of the above-mentioned problems, the present invention discloses a switch device and a multi-channel coupling selector having the switch device, so as to overcome the problem in the prior art that the switch damages the internal components of the CMOS device when it is turned on, and to apply the switch Interference problems such as noise and crosstalk brought by the selector

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