Combined directional coupler and impedance matching circuit

摘要

An output circuit with an integrated directional coupler and impedance matching circuit is disclosed. In an exemplary design, an apparatus includes a switchplexer and an output circuit. The switchplexer is coupled to at least one power amplifier. The output circuit is coupled to the switchplexer and a load (e.g., an antenna) and includes a directional coupler and an impedance matching circuit sharing at least one inductor. The output circuit performs impedance matching for the load. The output circuit also acts as a directional coupler and provides an input radio frequency (RF) signal as an output RF signal and further couples a portion of the input RF signal as a coupled RF signal. Reusing the at least one inductor for both the directional coupler and the impedance matching circuit may reduce circuitry, size, and cost of the wireless device and may also improve performance.

主权项

1. An apparatus comprising:
an output circuit coupled to a switchplexer, the output circuit comprising a directional coupler and an impedance matching circuit, the directional coupler and the impedance matching circuit sharing at least one inductor used for both directional coupling and to match an impedance of the switchplexer, the output circuit configured to receive an input radio frequency (RF) signal and convey an output RF signal and a reflected RF signal received from a load coupled to the output circuit.