General-purpose analog switch with controlled differential equalization voltage-slope limit

Abstract

A differential-slope-limiting-switch and method are provided. Generally, the switch includes a first transistor having a first source-drain (SD) and well coupled to a first port of the switch, a gate, and a second SD, and a second transistor having a first SD and well coupled to a second port, a gate, and a second SD coupled to the second SD of the first transistor. A selector-circuit couples the gate of the first transistor to a first current-source when a signal to close the switch is received, and to the first port when it is not received. A second selector-circuit couples the gate of the second transistor to a second current-source when the signal is received, or to the second port. First and second feedback-capacitors couple each gate to the port on opposite sides of the switch and with the current-sources limit a slope of voltage transitions across the closed switch.

Description

[0001] Cross References to Related Applications [0002] This application is an International Application of U.S. Non-Provisional Application No. 16 / 823,528, filed March 19, 2020, which claims priority and benefit from U.S. Provisional Patent Application No. 62 / 821,880, filed March 21, 2019 , both applications are hereby incorporated by reference in their entirety for all purposes. technical field [0003] The present disclosure relates generally to analog switches, and more particularly to differential slope limited analog switches and methods of operating differential slope limited analog switches for use in multi-consumer voltage regulators. Background technique [0004] Analog switches are designed for use in a wide range of applications for connecting or disconnecting signals on different sides of the switch, and / or (typically) equalizing the voltage between the sides when the signals are in different voltage domains . Referring to FIG. 1 , a conventional analog switc...

AI Technical Summary

Problems solved by technology

Using conventional analog switches to connect consumers to and disconnect consumers from a voltage source through a voltage regulator typically results in rapid and uncontrolled changes in voltage over time (dv / dt), causing switching High voltage slope transitions across, and undesirably high peak current and / or undervoltage conditions

Furthermore, if left unrestricted, this voltage slope could cause an undesired temporary voltage drop at the voltage source output and / or voltage source supply

[0007] Another problem with conventional analog switches arises in applications where multiple conventional analog switches are used in an attempt to supply multiple consumers in a system or device from a single regulated voltage source

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