Hittite Microwave Norway As

Rune Kaald

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.

Continuous time delta sigma converter having a VCO based quantizer

A continuous time &#x394;&#x3a3; analog-to-digital converter with mitigation bit shifting multiplex array including a loop filter, a VCO responsive to analog signal configured to adjust the output frequency based on the magnitude of the analog signal and produce a digital output, a multi-stage phase quantizer responsive to the digital output configured to determine the phase of the VCO by comparing the phase of the VCO for a particular sample to a reference phase at said particular sample and generate a quantized phase difference value, and a multiplexer array coupled to the multi-stage phase quantizer configured to shift selected misaligned bits of the quantized phase difference value by a predetermined amount of bits to mitigate bit shifting of the multi-stage phase quantizer.

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Trondheim, Norway

Rune Kaald