Controlled switching switching circuits and switching devices

Abstract

The invention provides a controlled switch switching circuit and a switch device; the circuit includes: a first enable signal receiving end is used to receive the first enable signal of the negative pressure module; a control output end is used to communicate with the negative pressure module The controlled end of the control switch is connected; the second control component is used to: output the first voltage when the first enabling signal is enabled and output the second voltage when the first enabling signal fails, the first voltage is the ground voltage, and the second The second voltage will gradually increase from the negative voltage value to the ground voltage; the difference between the negative voltage value and the output voltage of the negative voltage module is less than a preset threshold; the first control component is used for: when the first enabling signal is enabled, outputting a first control signal to control the controlled switch to be turned off; and outputting a second control signal to control the controlled switch to be turned on when the first enabling signal fails.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a controlled switching circuit and a switching device. Background technique [0002] Negative pressure is often used in integrated circuit systems. For example, switches in radio frequency front-ends need to use negative pressure to control the on-off of the switch. The structure of the negative pressure module in the related art can be as follows: figure 1 As shown, its working principle is that before the enable signal (EN) takes effect, the switches S1a and S2 are closed, and the switch S1b is opened. At this time, the capacitor C is precharged through the power supply NVDD, and the switches S1a, S1b and S2 are activated by the enable signal. EN control, when the enable signal EN takes effect, the switches S1a and S2 are turned off, and the switch S1b is turned on. When the switch S1b is closed, the positively charged capacitor VNEG_B is pulled to the ground level. Since...

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Problems solved by technology

When the enable signal EN fails, the schematic diagram of the waveform of each node of the traditional controlled switch switching circuit in the negative pressure module is as follows: image 3 As shown, and this phenomenon will become more obvious as the load driven by VNEG becomes heavier. The current flowing back will raise the NVDD level, which will affect the NVDD generating circuit, and there is a risk of overvoltage. At the same time, NVDD is used in the entire system All circuit blocks are likely to be affected by elevated NVDD

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