Method and apparatus for transistor switch isolation

摘要

A transistor switch that provides isolation is described. The transistor switch is adapted to receive an input signal at an input terminal and either transmit the input signal to an output terminal when the transistor switch is in a first state or ground the input signal when the transistor switch is in a second state. The transistor switch comprises series switches, which couple the input terminal to the output terminal when the transistor switch is in the first state; shunt switches, which couple the input terminal to ground when the transistor switch is in the second state; and filters to provide isolation between the input terminal and the output terminal.

主权项

1. A switching arrangement adapted to receive an input signal and either transmit the input signal or ground the input signal, comprising:
a plurality of filters, wherein each filter in the plurality of filters is adapted to receive a first control signal and to transmit the first control signal to an output of the filter with a corresponding filter time constant; a first set of switching devices serially connected therebetween, wherein:
a first switching device in the first set of switching devices is configured to receive the input signal,a last switching device in the first set of switching devices is configured to transmit the input signal, andeach switching device is connected with a filter in the plurality of filters and configured to receive the output of the filter and react to the output of the filter with a corresponding switch time constant larger than the filter time constant; and a second set of switching devices, wherein each switching device in the second set of switching devices:
is connected on one end with a switching device in the first set of switching devices,is connected on a second end to a ground terminal,is configured to receive a second control signal, andis configured to ground the input signal, wherein whether the switching arrangement transmits the input signal or grounds the input signal is based on values of the first and second control signals, and wherein a switching speed of the switching arrangement is dominated by the switch time constant.