Broadband circuit for an active device

摘要

A circuit includes a de-Qing network coupled in parallel between a first and a second series-coupled reactive network. The de-Qing network is sized to lower the quality factor of the second reactive network. The first reactive network is a low valued inductor, which is sized for modifying high frequency signals. The second reactive network is a high valued inductor, which is sized for modifying low frequency signals. The de-Qing network can be a resistor or combination of resistors, inductors, and capacitors.

主权项

1. A circuit for maximizing linear range and frequency coverage for an active device, the circuit comprising:
the active device comprising a pair of RF input ports for receiving an RF input, a pair of RF output ports for providing an RF output that is a linear function of the RF input at the RF input ports, and a first DC bias control port and a second DC bias control port for providing a DC bias current to the active device; a first reactive network having a first impedance coupled to the first DC bias control port of the active device and a second impedance coupled to the second DC bias control port of the active device, the first reactive network for substantially blocking high frequency radio frequency (RF) signals; a second reactive network having a first impedance coupled to the first impedance of the first reactive network and a second impedance coupled to the second impedance of the first reactive network, the second reactive network for substantially blocking low frequency RF signals, wherein the first reactive network and the second reactive network are configured independent of each other; a de-Qing network selected from the group consisting of a resistive de-Qing network and an inductive de-Qing network, the de-Qing network coupled in parallel between the first reactive network and the second reactive network between the first impedance and the second impedance of the first reactive network, the de-Qing network being sized to lower a quality factor of the first and the second reactive networks and including a floating virtual ground between the first impedance and the second impedance of the first reactive network; and a DC source connected to the second reactive network to supply the active device with a DC bias current.