Cooperative tunable RF filters

摘要

RF communications circuitry, which includes a first tunable RF filter and a second tunable RF filter, is disclosed. The first tunable RF filter is coupled to the second tunable RF filter. The RF communications circuitry operates in one of a first operating mode and a second operating mode. During the first operating mode, the second tunable RF filter receives and filters an upstream RF signal to provide a filtered RF signal. Further, during the first operating mode, the first tunable RF filter augments a frequency response of the second tunable RF filter.

主权项

1. An apparatus configured to operate in one of a first operating mode and a second operating mode, and comprising a first RF filter structure having a connection node and a common connection node, wherein the first RF filter structure comprises:
a shunt RF switch coupled between the connection node and a ground; a first tunable RF filter coupled to a second tunable RF filter and configured to during the second operating mode, not augment a frequency response of the second tunable RF filter; and the second tunable RF filter, which is coupled between the connection node and the common connection node, is configured to during the first operating mode, receive and filter an upstream RF signal to provide a filtered RF signal, such that the first tunable RF filter is configured to augment a frequency response of the second tunable RF filter.