Continuous-time delta sigma modulator
View Patent ↗A continuous-time delta sigma modulator, having an integrator and a comparator clocked with a clock frequency that are connected in a feedback loop, having a voltage source that is connected to the comparator for applying a threshold voltage to the comparator, in which an integration time constant of the integrator has a first resistor and a first capacitor, in which the voltage source has a second resistor and a second capacitor for setting the threshold voltage, in which the first resistor and the second resistor are part of a resistor pairing structure, and in which the first capacitor and the second capacitor are part of a capacitor pairing structure.
1. A continuous-time delta sigma modulator comprising:
an integrator and a comparator clocked with a clock frequency that are connected in a feedback loop; and
a voltage source that is connected to the comparator and outputs a threshold voltage to the comparator,
wherein the comparator output different values based on a difference between an input voltage received from the integrator and the threshold value received from the comparator,
wherein an integration time constant of the integrator has a first resistor and a first capacitor,
wherein the voltage source has a second resistor and a second capacitor for setting the threshold voltage,
wherein the first resistor and the second resistor are part of a resistor pairing structure, and
wherein the first capacitor and the second capacitor are part of a capacitor pairing structure.
2. The continuous-time delta sigma modulator according to claim 1 , wherein the comparator is configured to change a loop gain of the feedback loop via the threshold voltage.
3. The continuous-time delta sigma modulator according to claim 1 , wherein the voltage source is configured to produce the threshold voltage from the input quantities of a reference voltage and a period of the clock frequency and from a time constant, and wherein the time constant is based on the second resistor and the second capacitor.
4. The continuous-time delta sigma modulator according to claim 1 , wherein the threshold voltage has an inverse proportional dependence on the product of the first resistor and the first capacitor and the clock frequency.
5. The continuous-time delta sigma modulator according to claim 1 , wherein the voltage source has semiconductor switches for controlling a discharging of the second capacitor and for controlling a charging of the second capacitor through the second resistor for the duration of one period of the clock frequency.
6. The continuous-time delta sigma modulator according to claim 1 , wherein the feedback loop has additional integrators to form a delta sigma modulator of an order higher than one.
7. A continuous-time delta sigma modulator comprising:
an integrator and a comparator clocked with a clock frequency that are connected in a feedback loop; and
a voltage source that is connected to the comparator for applying a threshold voltage to the comparator,
wherein an integration time constant of the integrator has a first resistor and a first capacitor,
wherein the voltage source has a second resistor and a second capacitor for setting the threshold voltage,
wherein the first resistor and the second resistor are part of a resistor pairing structure,
wherein the first capacitor and the second capacitor are part of a capacitor pairing structure, and
wherein the comparator is configured to change a loop gain of the feedback loop via the threshold voltage.
8. A continuous-time delta sigma modulator comprising:
an integrator and a comparator clocked with a clock frequency that are connected in a feedback loop; and
a voltage source that is connected to the comparator for applying a threshold voltage to the comparator,
wherein an integration time constant of the integrator has a first resistor and a first capacitor,
wherein the voltage source has a second resistor and a second capacitor for setting the threshold voltage,
wherein the first resistor and the second resistor are part of a resistor pairing structure,
wherein the first capacitor and the second capacitor are part of a capacitor pairing structure, and
wherein the threshold voltage has an inverse proportional dependence on the product of the first resistor and the first capacitor and the clock frequency.