Voltage-to-time converter in analog-to-digital converter

A voltage-to-time converter, comprising:

• a first amplifier stage, configured to receive an input differential voltage, and generate a first voltage signal in response to the input differential voltage, which decreases in a stepwise manner during a conversion phase of the voltage-to-time converter;
• a second amplifier stage, coupled to the first amplifier stage, and configured to convert the first voltage signal into a second voltage signal, which is proportional to the input differential voltage, using a hybrid complementary push-pull structure;
• and
• an inverter, coupled to the second amplifier stage, and configured to convert the second voltage signal to generate a time representation signal.

A method, comprising:

• converting, by a pre-amplifier stage of a voltage-to-time converter, a first input voltage and a second input voltage to generate a first voltage signal, wherein the second input voltage decreases in a staircase manner during a conversion phase of the voltage-to-time converter;
• and
• converting, by a complementary push-pull common source amplifier of the voltage-to-time converter, the first voltage signal to a second voltage signal, which is proportional to a differential voltage between the second input voltage and the first input voltage;
• and
• converting, by an inverter, the second voltage signal to a time representation signal.