Loading patent…
AssigneeBurr-Brown Corporation
InventorsBinan Wang, Timothy V. Kalthoff, Miaochen Wu
Estimating the term…
Programmable resolution/bias current control circuitry is provided in a delta sigma analog-to-digital converter including an input sampling circuit, a feedback reference sampling circuit, an integrator including an operational amplifier, a comparator, and a digital filter, the input sampling circuit and the feedback reference sampling circuit being coupled to a first input of the operational amplifier, an output of the operational amplifier being coupled to an input of the comparator, an output of the comparator being coupled to an input of the digital filter. The programmable resolution/bias control circuitry includes a clock generator circuit supplying a clock signal to the input sampling circuit and the feedback sampling circuit at a sampling frequency determined by a sampling frequency control signal. A bias current generator circuit supplies a bias current to the operational amplifier to control the settling time of an output step voltage signal produced by the operational amplifier. A control circuit receives a resolution control signal and changes both the sampling frequency control signal and a bias control signal in response to the resolution control signal so as to achieve a predetermined tradeoff between resolution of the digital output and dc power dissipation of the analog-to-digital converter.
In a delta sigma analog-to-digital converter including an input sampling circuit, a feedback reference sampling circuit, an integrator including an operational amplifier, a comparator, and a digital filter, the input sampling circuit and the feedback reference sampling circuit being coupled to a first input of the operational amplifier, an output of the operational amplifier being coupled to an input of the comparator, an output of the comparator being coupled to an input of the digital filter, programmable resolution control circuitry comprising in combination:
An analog-to-digital converter comprising in combination:
A method for controlling the resolution of the digital output of an analog-to-digital converter including an input sampling circuit, a feedback reference sampling circuit, an integrator including an operational amplifier, a comparator, and a digital filter, the input sampling circuit and the feedback reference sampling circuit being coupled to a first input of the operational amplifier, an output of the operational amplifier being coupled to an input of the comparator, an output of the comparator being coupled to an input of the digital filter, the method comprising the steps of:
In a delta sigma analog-to-digital converter including an input sampling circuit, a feedback reference sampling circuit, an integrator including an operational amplifier, a comparator, and a digital filter, the input sampling circuit and the feedback reference sampling circuit being coupled to a first input of the operational amplifier, an output of the operational amplifier being coupled to an input of the comparator, an output of the comparator being coupled to an input of the digital filter, programmable resolution control circuitry comprising in combination:
Dependencies are inferred from the claim text.