Quadrature bandpass ΔΣ converter

Details Quadrature bandpass ΔΣ converter Quadrature bandpass ΔΣ converter

2007-08-28

2007-08-28

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

11445413

ABSTRACT:
An improved quadrature bandpass ΔΣ converter includes a loop filter, an ADC responsive to the loop filter, and a first feedback DAC responsive to the ADC; a first summing circuit is responsive to the first DAC and an analog input for providing an input to the loop filter; a second feedback DAC is responsive to the ADC for providing an input to the loop filter; the loop filter includes a plurality of signal resonators, at least one image resonator, a second summing circuit, and a feed forward circuit connecting at least two of the resonators to the second summing circuit for reducing the quantization noise from the ADC; the image resonator is responsive to the second DAC for reducing the image quantization noise.

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