Circuits and methods related to adjustable compensation for parasitic effects in radio-frequency switch networks. In some embodiments, an adjustable compensation circuit for a radio-frequency (RF) circuit can include an inductive circuit that couples a selected node of the RF circuit with a reference node. The inductive circuit can be configured to provide a plurality of inductance values. In some embodiments, the RF circuit can be, for example, a switch network having a plurality of switchable RF signal paths, the reference node can be a ground node, and the selected node can be a common node such as an antenna port.

Switching circuits for wireless applications. In some embodiments, a switching circuit can include a common node and a plurality of series arm switches with each being capable of connecting the common node and a respective signal node. The switching circuit can further include a shunt arm switch for each of the series arm switches. The shunt arm switch can be capable of connecting the signal node of the respective series arm switch to a ground. The switching circuit can further include a compensation circuit coupled to the common node and configured to compensate for a parasitic effect resulting from some or all of the series arm switches and the shunt arm switches.

Architectures and methods related to insertion loss reduction and improved isolation in switch designs. In some embodiments, a switching architecture can include a switch network having one or more switchable radio-frequency (RF) signal paths, where each path contributes to a parasitic effect associated with the switch network. The switching architecture can further include a parasitic compensation circuit coupled to a node of the switch network. The parasitic compensation circuit can be configured to compensate for the parasitic effect of the switch network.

Methods, systems, and devices are described for triggering an antenna switch. A settling time may be identified, and the antenna switch may be delayed based at least in part on the identified settling time. The settling time may include an estimated delay in reception attributable to settling following the antenna switch.

This application discloses a tag quantity estimation system and method of RFID. A processor-readable medium was disclosed at the same time. This estimation method applies a spatial diversity gain existing in a multi-antenna system. Separated and sequentially stacked the real parts and the imaginary parts of the multiple signals received by multiple antennas. Then, a tag quantity estimation problem is converted into a data clustering problem in high-dimensional space. In this way, the overlapped cluster data in low-dimensional space can be separated in the high-dimensional space, thereby improving the accuracy of tag quantity estimation.