| 摘要 |
Mixer-systems ( 1 ) comprising mixer-circuits ( 2 ) with mixers ( 3 ) for frequency translating signals comprising audio/video information and for use in mobile phones or television receivers are provided with amplitude detectors ( 6 ) for making amplitude corrections during said frequency translating of said signals comprising audio/video information (basic idea), to correct amplitude errors resulting (insight) from designs with integration technologies based upon small transistors (with small transistors having a size such that phase errors are no longer dominating the performance). Said mixer-circuit ( 2 ) comprises amplifier-circuits ( 3,4 ) with controllable gains, and said amplitude detectors ( 6 ) comprise level detectors ( 61,62 ) and amplifiers ( 63 ). Further amplitude detectors ( 7,8,9 ) make common-mode corrections and comprise either level detectors ( 71,72,81,82 ) and amplifiers ( 73.83 ) or adders ( 91 ) and level detectors ( 92 ) and amplifiers ( 93 ) and range detectors ( 94 ) and inverters ( 95 ). Amplifier-circuits ( 4,5 ) comprise amplifiers ( 41,51 ) with adjustable resistor-elements ( 42,43,52,53 ) and with further adjustable resistor-elements 44,45,54,55 ) for making phase corrections.
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