H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/94
H04N 5/44 (2006.01)
Patent
CA 1139431
ABSTRACT OF THE DISCLOSURE A system is described for interfacing a SWIF with a tuner and an amplifier in the IF section of a television receiver. In the preferred arrangement, the tuner is coupled to the input of the SWIF so as to efficiently transfer signal power to the SWIF over the frequency range of the tuner's output. The output of the SWIF is coupled to an amplifier which has a low, untuned input impedance to establish a mismatch between the SWIF and the amplifier to thereby reduce triple- transit effects associated with the SWIF. Preferably, the amplifier is a common-base amplifier whose input impedance is defined by a real impedance component which is substantially smaller in magnitude than its reactive impedance component. Hence, the real component of the amplifier's input impedance is dominant and the effects of stray capacitance between the SWIF and the amplifier are reduced.
359105
Macrae & Co.
Zenith Radio Corporation
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