H - Electricity – 03 – D
Patent
H - Electricity
03
D
H03D 7/00 (2006.01) H03J 1/00 (2006.01) H04B 1/26 (2006.01) H04B 15/06 (2006.01) H03D 7/16 (2006.01)
Patent
CA 2296216
A double conversion tuner (DCT) free of spurious signals generated by the local oscillator frequencies and the crystal reference frequency is described herein. These spurious signals are generated by the first and/or second oscillator signals as well as by their harmonic frequencies. Spurious signals are also generated when the crystal reference frequency is not properly selected. In the past, complex mechanical designs had to be used to isolate circuit blocks to reduce these spurious signals. By using a dynamic first intermediate frequency and/or selecting the value of the crystal reference frequency, these spurious signals can be reduced or eliminated.
Arredondo David Coronel
Campos Eduardo Enrrique Arguello
Matsushita Electronic Components de Baja California S.a. de C.v.
Oyen Wiggs Green & Mutala Llp
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