A modulator circuit may include an integrator circuit and a gain compensation circuit. The integrator circuit may include a first amplifier including an input to receive a signal and an output to provide an inverted signal and a capacitor including a first terminal coupled to the input and a second terminal coupled to the output. The gain compensation circuit may include a second inverter amplifier including a gain input coupled to the output of the first amplifier and including a gain output; a first resistor including a first terminal coupled to the gain output and including a second terminal; and a second capacitor including a first terminal coupled to the second terminal of the first resistor and including a second terminal coupled to the gain input. The integrator circuit has a finite DC gain and the gain compensation circuit is configured to compensate for the finite DC gain.

An example apparatus includes: a first switch having a first terminal and a second terminal; analog-to-digital converter (ADC) circuitry having an input and an output, the input of the ADC circuitry coupled to the first terminal of the first switch; digital-to-analog converter (DAC) circuitry having an input and an output, the input of the DAC circuitry coupled to the output of the ADC circuitry; combination circuitry having a first input, a second input, and an output, the first input of the combination circuitry coupled to the second terminal of the first switch, the second input of the combination circuitry coupled to the output of the DAC circuitry; amplifier circuitry having an input and an output, the input of the amplifier circuitry coupled to the output of the combination circuitry; and a second switch having a terminal coupled to the output of the amplifier circuitry.