首页>
外国专利>
Single-chip digital cable TV/cable modem tuner IC
Single-chip digital cable TV/cable modem tuner IC
展开▼
机译:单芯片数字有线电视/电缆调制解调器调谐器IC
展开▼
页面导航
摘要
著录项
相似文献
摘要
A television receiver is provided including a first mixer having a first input adapted for receiving an input signal in a predetermined frequency range. It should be noted that the input signal may take the form of either a broadcast television signal, a cable television signal, or a digital signal transmitted over a cable delivery system. The first mixer further includes a second input adapted for receiving a first reference signal having a first operating frequency. In use, the first mixer is suitable for outputting an intermediate frequency signal having a frequency greater than at least one frequency in the predetermined frequency range. Also included is a filter for filtering the intermediate frequency signal. A phase shifting network is provided which includes an input adapted for receiving a second reference signal having a second operating frequency. The phase shifting network further includes a pair of outputs. In operation, the phase shifting network is suitable for outputting a pair of quadrature reference signals each having a frequency substantially equal to the second operating frequency. A pair of second mixers each have a first input coupled to the filter and a second input coupled to one of the outputs of the phase shifting network. The second mixer serves for generating output signals that are in quadrature and at a baseband frequency. A pair of low-pass filters are coupled to the second mixers for filtering the output signals.
展开▼