| 摘要 |
Three-phase mixer-systems comprising at least three groups of mixers ( 1 - 4,5 - 8,9 - 12,30 ) for frequency translating signals are (basic idea) provided with balancing means ( 13 - 21,31 ) for suppressing certain mixing products with harmonics of the oscillator signal resulting from unbalance (insight). Said three groups of mixers ( 1 - 4,5 - 8,9 - 12 ) each comprise a group of switching transistors ( 1 - 3,5 - 7,9 - 11 ) and an amplifying transistor ( 4,8,12 ) coupled to said group of switching transistors ( 1 - 3,5 - 7,9 - 11 ) and are balanced by said balancing means ( 13 - 21 ) comprising per group of mixers ( 1 - 4,5 - 8,9 - 12 ) and per at least one switching transistor of said group of switching transistors ( 1 - 3,5 - 7,9 - 11 ) a further switching transistor ( 13 - 21 ). Said three groups of mixers ( 30 ) can also be balanced by a further group of mixers ( 31 ), with said group of mixers ( 30 ) receiving second signals (R,S,T) and first signals (r RF,s RF,t RF), with said further group of mixers ( 31 ) receiving inverted second signals (-R,-S,-T) and (inverted combinations or not of) said first signals (r RF,s RF,t RF), and with outputs of said group of mixers ( 30 ) and of said further group of mixers ( 31 ) being coupled to each other for generating combinations (sums or differences) of output signals.
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