RF switches having increased voltage swing uniformity

摘要

Radio-frequency (RF) switch circuits are disclosed providing uniform voltage swing across a transmit switch for improved device performance. A switching circuit includes a switch having field effect transistors (FETs) defining an RF signal path between the input port and the output port, the switch configured to be capable of being in a first state corresponding to the input and output ports being electrically connected so as to allow passage of the RF signal therebetween, and a second state corresponding to the input and output ports being electrically isolated. The switching circuit includes a voltage distribution circuit configured to reduce voltage distribution variation across the switch, including one or more elements coupled to a selected body node of one or more FETs so as to reduce voltage distribution variation across the switch when the switch is in the first state and encountered by an RF signal at the input port.

主权项

1. A switching circuit, comprising:
an input port configured to receive a radio-frequency (RF) signal; an output port configured to output the RF signal; a switch including a first field effect transistor (FET) having a first body node and a second FET having a second body node, the first and second FETs defining an RF signal path between the input port and the output port, the switch configured to be capable of being in first and second states, the first state corresponding to the input and output ports being electrically connected so as to allow passage of the RF signal therebetween, the second state corresponding to the input and output ports being electrically isolated; and a voltage distribution circuit configured to reduce voltage distribution variation across the switch, the voltage distribution circuit including a connection path connected between the first body node and the second body node, the connection path including a first resistor and a first capacitor connected in series with the first resistor, the voltage distribution circuit further including a resistive network connected between the first body node and the second body node, the resistive network including a bias node connected between third and of the resistive network.