Three-phase mixer-system

Abstract

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.

Dependencies are inferred from the claim text.