Introduction to R2RC D/A converter
View Patent ↗A Digital to Analog (D/A) converter has a plurality of stages. Each of the plurality of stages has a first resistive element. A second resistive element is coupled to the first resistive element and has approximately twice a resistive value of the first resistive element. A capacitor is coupled to the second resistive element. A switching circuit is coupled to the capacitor. A summing integrator is coupled to each of the plurality of stages.
1. A Digital to Analog (D/A) converter comprising:
a plurality of stages wherein each of the plurality of stages comprises:
a first resistive element;
a second resistive element coupled to the first resistive element and having approximately twice a resistive value of the first resistive element;
a capacitor coupled to the second resistive element; and
a switching circuit coupled to the capacitor; and
a summing integrator coupled to each of the plurality of stages.
2. A Digital to Analog (D/A) converter in accordance with claim 1 wherein the capacitor is coupled in parallel to the second resistive element.
3. A Digital to Analog (D/A) converter in accordance with claim 1 wherein the capacitor reduces a resistive effect of the switching circuit.
4. A Digital to Analog (D/A) converter in accordance with claim 1 wherein the summing integrator comprises:
an operational amplifier having a first input coupled to the plurality of stages, a second input coupled to ground potential, and an output;
a feedback capacitor coupled to the output of the operational amplifier and the first input of the operational amplifier; and
a summing integrator switching circuit coupled to the operational amplifier and the feedback capacitor.
5. A Digital to Analog (D/A) converter in accordance with claim 4 wherein the operational amplifier is a two stage operational amplifier having a cascode symmetrical OTA input stage.
6. A Digital to Analog (D/A) converter in accordance with claim 1 wherein the summing integrator sums the charges transmitted from each of the plurality of stages.
7. A Digital to Analog (D/A) converter comprising:
a plurality of stages wherein each of the plurality of stages comprises:
a first resistive element;
a second resistive element coupled to the first resistive element and having approximately twice a resistive value of the first resistive element;
a capacitor coupled in parallel to the second resistive element; and
a switching circuit coupled to the capacitor; and
a summing integrator coupled to each of the plurality of stages for summing the charges transmitted from each of the plurality of stages.
8. A Digital to Analog (D/A) converter in accordance with claim 7 wherein the capacitor reduces a resistive effect of the switching circuit.
9. A Digital to Analog (D/A) converter in accordance with claim 7 wherein the summing integrator comprises:
an operational amplifier having a first input coupled to the plurality of stages, a second input coupled to ground potential, and an output;
a feedback capacitor coupled to the output of the operational amplifier and the first input of the operational amplifier; and
a summing integrator switching circuit coupled to the operational amplifier and the feedback capacitor.
10. A Digital to Analog (D/A) converter in accordance with claim 9 wherein the operational amplifier is a two stage operational amplifier having a cascode symmetrical OTA input stage.
11. A Digital to Analog (D/A) converter comprising:
a plurality of stages wherein each of the plurality of stages comprises:
a first resistive element;
a second resistive element coupled to the first resistive element and having approximately twice a resistive value of the first resistive element;
a capacitor coupled in parallel to the second resistive element; and
a switching circuit coupled to the capacitor; and
a summing integrator coupled to each of the plurality of stages;
wherein the capacitor reduces a resistive effect of the switching circuit.
12. A Digital to Analog (D/A) converter in accordance with claim 11 wherein the summing integrator comprises:
an operational amplifier having a first input coupled to the plurality of stages, a second input coupled to ground potential, and an output;
a feedback capacitor coupled to the output of the operational amplifier and the first input of the operational amplifier; and
a summing integrator switching circuit coupled to the operational amplifier and the feedback capacitor.
13. A Digital to Analog (D/A) converter in accordance with claim 12 wherein the operational amplifier is a two stage operational amplifier having a cascode symmetrical OTA input stage.
14. A Digital to Analog (D/A) converter in accordance with claim 11 wherein the summing integrator sums the charges transmitted from each of the plurality of stages.