SELF-ALIGNING RESONATOR FILTER CIRCUIT AND WIDEBAND TUNER CIRCUIT INCORPORATING SAME

摘要

A self-aligning resonator filter, a self-aligning coupled resonator filter circuit (200), and a television tuner circuit incorporating the filter and the circuit are disclosed herein. The self-aligning resonator filter leverages the local oscillator (208) of the tuner circuit and can be realized with a significant reduction in the amount of off-chip components. The self-aligning resonator filter is configured to align its tunable resonator (206) to resonate at a desired frequency in response to a phase difference measured across a resistance element during a tuning mode, and the resistance element (216) is switched out of the self-aligning resonator filter during a run mode. The self-aligning coupled resonator filter circuit is configured to isolate its individual resonator stages during tuning such that each resonator stage can be aligned without being influenced by the other resonator stage. The television tuner circuit can be manufactured at relatively low cost while retaining high performance and the ability to be dynamically aligned while in use.