Receiver for RF-signals comprising a pair of parallel signal paths
Superheterodyne receiver Patent #: 4642675
ApplicationNo. 07/165660 filed on 03/08/1988
US Classes:348/726, Demodulator348/678, Automatic range control (e.g., AGC, automatic contrast control)455/265With local oscillator synchronization or locking
ExaminersPrimary: Chin, Tommy P.
Attorney, Agent or Firm
International ClassesH04N 5/44 (20060101)
H04N 5/455 (20060101)
H03D 1/00 (20060101)
H03D 1/24 (20060101)
Foreign Application Priority Data1987-03-14 EP
AbstractA frequency converter circuit for television signals is disclosed which contains a tuner and a low-IF converter which converts the television signal to a low IF signal to obtain adjacent-channel selectivity with low-pass filters. The low-IF converter further includes a phase-correcting stage and an amplitude-correcting stage for the two quadrature-signal paths. By digitizing the two signal paths after the first quadrature mixing process, their amplitude and phase stability is further improved.