| 摘要 |
A circuit (fig. 2) comprising a first switch (P1 and P2) for sampling a differential signal and a second switch (N1 and N2) for level shifting the sampled differential signal is disclosed. The first and second switches are cross-coupled to cancel a charge injected between the first and second switches and for linearizing the charge transfer; and a capacitor (124) coupled between the first and second switches. A circuit in accordance with the present invention adds an extra sampling switch (P3 and P4) to the sampling circuit and an extra charge transfer switch (N3 and N4) in the level shifting circuit. By cross coupling these extra switches, the result is a cancellation of the charge injection, and thus linearizing the charge transfer.
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