Switch circuit and control method thereof, switched capacitor circuit and control method thereof

Abstract

The invention discloses a switch circuit and its control method, and a switched capacitor circuit and its control method. The switch circuit includes: a plurality of switch components; a switch module; and a capacitor, the capacitor has a first terminal and a second terminal, the first terminal is coupled to a predetermined voltage, and the second terminal is at In a conduction mode, the switch module is selectively electrically connected to at least one control terminal of the switch components to control the conduction state of the at least one switch component.

Description

technical field [0001] The invention relates to a switch circuit and a switched capacitor circuit using the switch circuit, in particular to a switch circuit for sharing capacitance and a switched capacitor circuit using the switch circuit. Background technique [0002] In today's circuits, the requirements for speed and linearity are quite high, and it is therefore desirable for the switching components in the circuit to have low resistance values. Generally speaking, MOSFETs (metal-oxide semiconductor field-effect transistors, metal-oxide semiconductor field-effect transistors) are used as switching components, so there must be sufficient cross-voltage between the gate terminal and the source terminal, so that the switching components can have a sufficiently low resistance value. However, because the supply voltage (Vdd) that the chip can provide to the switch component tends to decrease gradually, the cross-voltage between the gate terminal and the source terminal of the...

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Problems solved by technology

[0004] However, if such a mechanism is to be used, each switch component needs to be equipped with a voltage adjustment capacitor, so a considerable circuit area is required, which is not in line with the current trend of circuit miniaturization

[0005] In the known switched capacitor circuit, under different working configurations, the number of switch components connected to it is different, resulting in inconsistent impedance of the switch components connected, which makes the linearity of the capacitor switching circuit decrease; familiar with the capacitor switching circuit As the reader knows, due to the difference in the number of switch components connected electrically, the voltage at the control terminal of the switch component will not be a fixed value, which is caused by the so-called charge sharing effect.

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