| 摘要 |
A mixed signal CODEC including an improved sigma-delta ADC (20) which limits input signals into a switched capacitor configuration and avoids adding circuit overhead in the signal path is disclosed herein. Additionally, it avoids overshoot and settling problems. This sigma-delta analog-to-digital converter (20), having an input signal and an output signal, includes a switch (sw1), a clipping circuit (21), and a known sigma-delta ADC (34). It solves the clipping signal problem by limiting the signal right at the input of the sigma-delta ADC (34). The clipping circuit (21) couples to the switch (sw1) and the sigma-delta ADC (34) for switching the voltage applied to the sigma-delta ADC between the input signal (vin) and at least one threshold voltage (Vn and Vp).
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