H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/94
H04N 5/44 (2006.01) H03D 7/16 (2006.01) H04B 1/26 (2006.01)
Patent
CA 1149877
ABSTRACT OF THE DISCLOSURE: The signal transmission lines in a double conversion stage for a double superheterodyne VHF-UHF television receiver are mainly constructed of unbalanced circuits rather than balanced circuits. The circuit arrangement comprises a wide- band amplifier for receiving the incoming carrier frequency, first and second frequency conversion stages, and an inter- mediate frequency amplifying stage. Connections between the wideband amplifier and the first frequency conversion stage as well as connections between the second frequency conversion stage and the intermediate frequency amplifying stage are achieved by means of unbalanced circuits. Each of the first and second frequency conversion stages comprises a mixer constructed of a single balanced circuit, a local oscillator and an unbalanced/balanced conversion circuit interposed therebetween. A filter circuit, comprising a band-pass filter and a low-pass filter, interposed between the first and second frequency conversion stages, effectively blocks spurious signals.
350721
Onishi Hiroshi
Sagawa Morikazu
Saito Mitsuo
Yamashita Sadahiko
Matsushita Electric Industrial Co. Ltd.
Robic Robic & Associes/associates
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