| 摘要 |
The invention concerns a mixer, in particular for an dual conversion receiver. The mixer includes a first variable transconductance stage (A) controlled by a high frequency carrier signal, this first stage including first ( 37 ) and second ( 38 ) terminals delivering a first signal; and a second stage (B) connected to said first terminal of the first stage including, in parallel, first (T 32 ) and second (T 33 ) switching means respectively controlled by first (in 2 ) and second (in 2 b) phase opposition control signals at a first intermediate frequency (IF 1 ), these first and second switching means being powered by a substantially equal current supplied by polarisation means ( 34 ). The mixer according to the invention is characterised in that it further includes means (T 36 ) for modulating said first signal delivered by said first stage by means of a third control signal (in 3 ) at a second intermediate frequency (IF 2 ).
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