| 摘要 |
Apparatus ( 20 ) for generating a sine shaped output signal at an output (Sn, Sp). The apparatus ( 20 ) comprises a first transistors (M 1 ) and a second transistor (M 2 ) being arranged as differential pair ( 22 ). The differential pair ( 22 ) has two input nodes (Tp, Tn) allowing a triangular input signal (V<SUB>in</SUB>(t)) with a given amplitude (A) to be applied between a gate (Tp) of the first transistor (M 1 ) and a gate (Tn) of the second transistor (M 2 ). The differential pair ( 22 ) further comprises a node (X) where a source of the first transistor (M 1 ) and a source of the second transistor (M 2 ) is connected. The sine wave shaped signal is provided between a drain (Sp) of the first transistor (M 1 ) and a drain (Sn) of the second transistor (M 2 ). A current mirror ( 21 ) is employed for feeding a predefined tail current (I<SUB>ss</SUB>) into/out of the node (X) of said differential pair ( 22 ). The differential pair ( 22 ) allows the first transistor (M 1 ) and the second transistor (M 2 ) to be operated in the saturation region such that the sine wave shaped output signal (I<SUB>o</SUB>; V<SUB>out</SUB>) is a nonlinear function of the triangular input signal (V<SUB>in</SUB>(t)).
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