Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2005-12-06
2005-12-06
Le, Lana (Department: 2685)
Telecommunications
Transmitter
Noise or interference elimination
C455S119000, C455S126000, C455S334000, C327S155000
Reexamination Certificate
active
06973293
ABSTRACT:
An apparatus and a method compare the output signal of a mixer in a detector with one of two input signals of the mixer, in order to compensate for the offset of a mixer or modulator. The detector determines the sign of the offset of the mixer. A compensation value is formed in an actuator unit by successive approximation. The value is transmitted to the mixer. In an advantageous embodiment of the invention, a simple phase detector (PD) is used to determine the offset sign (VZ). The above-described indirect measuring method functions with very high accuracy, even at only a very small offset. Offsets in the circuits preceding the mixer (MI1) are compensated for simultaneously. A manual or individual calibration of direct voltage offsets is therefore unnecessary.
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