Patent ID: 7187913
Filing Date: 2007-03-06
Classification: H03J,H04B,H04N

Abstract:
1. A tuner for receiving information signals within a channel selected from within a plurality of channels and being within a predesignated frequency band, the tuner comprising: a first filter for providing a plurality of passbands each being exclusively selectable in response to a filter selection signal designating a corresponding one of the plurality of passbands, each of said passbands being characterized by a bandwidth being sufficiently broad to admit signals in at least one of the plurality of channels with lesser attenuation than other signals; an input port for receiving information signals and conducting the received information signals to the filter; an output port for conducting any signals having been admitted by the first filter; superheterodyne circuitry including a mixer and a second filter for processing any signals coupled thereto via the output port and discriminating the received information signals within the selected channel; wherein, at least one of the first and second filters is a pass band filter integrated within a semiconductor substrate and comprising: a filter selection signal port for receiving a filter selection signal; a frequency data table for converting the filter selection signal to corresponding bias data signals; and, a capacitance D/A bias converter and an inductance D/A bias converter, being coupled to a variable capacitance and an active inductance respectively and being responsive respective ones of the bias data signals for adjusting the effective values of the reactance elements to effect a passband filter function as designated by the filter selection signal.