Invention Grant
US08760331B2 Continuous time delta sigma converter having a VCO based quantizer 有权
具有基于VCO的量化器的连续时间ΔΣ转换器

Continuous time delta sigma converter having a VCO based quantizer
Abstract:
A continuous-time delta sigma converter includes a loop filter having a plurality of serially coupled integrators including a first integrator responsive to an input of the Delta Sigma converter and a last integrator responsive to a first feedback loop and providing an integrated output signal, and a voltage controlled oscillator (VCO) based quantizer responsive to the loop filter for integrating the integrated output signal and providing a digital output signal. The first feedback loop includes a first time delay circuit responsive to the output of the quantizer and at least one switched capacitor digital to analog converter (DAC) responsive to the first time delay circuit. The first feedback loop is configured to differentiate the digital output signal twice and provide the last integrator of the loop filter with a double differentiated analog signal to reduce excess loop delay.
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