TUNER FOR RECEPTION OF DIGITAL AND ANALOG TELEVISION SIGNALS

摘要

A television tuner for tuning analog and digital television signals that requires only one off-chip filter. An integrated first frequency stage up-converts the received signal to a higher frequency. An off-chip filter provides coarse tuning of the up-converted signal. An integrated second frequency stage separates and down-converts the signal into I and Q components having a low IF in a range of 10-15 MHz. An integrated on-chip filter finely tunes the I and Q components. Where tuning of both analog and digital signals is contemplated, the on-chip filter is an image rejection filter. Where tuning of only digital signals is contemplated, the on-chip filter may be a DC notch filter.