Circuit for eliminating spurious components resulting from...

Details Circuit for eliminating spurious components resulting from... Circuit for eliminating spurious components resulting from...

H - Electricity

04

J

363/10.2

H04J 3/00 (2006.01) H04B 7/212 (2006.01) H04J 3/10 (2006.01)

Patent

CA 1180472

Abstract of the Disclosure: In an electronic circuit comprising a modulator (35) and used in each substation of a TDMA system and responsive to a baseband data signal sequence for producing a burst in accordance with a first burst control pulse, spurious components resulting in the burst from the first burst control pulse are eliminated either by allowing the data sequence to pass through a low-pass filter (36) after switching (45) the sequence by the first burst control pulse or by filtering the first burst control pulse by a low-pass filter before switching a local oscillation signal by the first control pulse. An additional switching circuit may switch either a modulated signal supplied from the modulator or the local oscillation signal in response to a second burst control pulse that disappears after extinction of the first burst control pulse. Alternatively, a modifying circuit reverses polarities of a preceding and a following data signals immediately preceding and following the sequence, relative to a leading and a trailing end data signals of the sequence. (Fig. 3)

393885

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