H - Electricity – 03 – J
Patent
H - Electricity
03
J
365/20
H03J 5/00 (2006.01) H03D 7/14 (2006.01) H04B 1/26 (2006.01)
Patent
CA 1233577
Abstract The output of a doubly-balanced mixer of a television tuner is terminated by a network which exhibits the characteristic impedance of the mixer for both the sum and difference frequency components. The difference frequency component termination simply consists of an inductor and a capacitor connected as a series-tuned circuit and a resistive element connected in series between the output of the mixer and signal ground. The inductor and capacitor are selected resonate at a frequency in the passband of the IF section and the resistive element is selected to exhibit the characteristic impedance of the mixer. The sum frequency component termination simply consists of a capacitor and a resistive element connected in series between the output of the mixer and signal ground. The capacitor is selected to exhibit negligible impedance just below the lowest frequency of the sum frequency component and the resistive element is selected to exhibit the characteristic impedance of the mixer.
501779
Eckersley Raymond A.
Rca Corporation
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