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).

Abstract: An integrated tuner circuit has an arbitrary IF (intermediate frequency) output. The tuner includes an integrated circuit with a fixed-frequency control loop and a matched external variable capacitance Ct, to achieve tracking of a tuned LC band-pass filter with an arbitrary oscillator.

Abstract: A system for converting analog wanted signals to digital wanted signals includes an analog filter, an analog-to-digital-converter, and a compensator. The analog filter at least partly suppresses both the analog wanted signals and analog unwanted signals. The compensator is used to compensate the digital output signals for the partly suppressing of the analog wanted signals. A method for converting analog wanted signals to digital wanted signals includes at least partly suppressing both the analog wanted signals and the analog unwanted signals and then compensating the wanted digital signals for the partly suppressing of the analog wanted signals.