Radio-frequency switches having extended termination bandwidth and related circuits, modules, methods, and systems

摘要

Circuits and methods related to a switch having extended termination bandwidth are disclosed. A switch having an input end and an output end, and capable of being in an ON state and an OFF state, can include a termination circuit configured to yield an extended frequency bandwidth in which a desired OFF state termination impedance is provided. A termination circuit may include two or more electrically parallel resistor-capacitor branches coupled to the switch input or output end. A switch termination circuit may provide an OFF state termination impedance that is substantially equal to the switch ON state termination impedance. Also, a termination circuit may enable a desired termination impedance without sacrificing other switch performance features, including insertion loss, isolation, or VSWR difference between ON and OFF states. Also disclosed are examples of how the foregoing features can be implemented in different products and methods of fabrication.

主权项

1. A switching circuit, comprising:
an input port configured to receive a radio-frequency (RF) signal; an output port; a switch configured to be capable of being in an ON state in which the switch passes the RF signal from the input port to the output port, and an OFF state in which the switch does not pass the RF signal; and a termination circuit configured to provide desired impedance for the input port or the output port, the termination circuit including an assembly including a resistor in electrical series with a capacitor, and an inductor in electrical series with the assembly, an effective capacitance of the termination circuit and an inductance of the inductor being selected such that the effective capacitance of the termination circuit resonates with an inductance of the termination circuit.