Abstract: A voltage-controlled oscillator analog-to-digital converter (VCO-ADC) includes a first source follower coupled between a first input terminal and a first internal node; a first VCO having an input coupled to a second internal node; a first variable resistor coupled between the first internal node and the second internal node; and a digital signal processing component coupled between an output of the first VCO and a output terminal.

Abstract: A voltage-controlled oscillator analog-to-digital converter (VCO-ADC) includes a first source follower coupled between a first input terminal and a first internal node; a first VCO having an input coupled to a second internal node; a first variable resistor coupled between the first internal node and the second internal node; and a digital signal processing component coupled between an output of the first VCO and a output terminal.

Abstract: An analog-to-digital converter includes a voltage-controlled oscillator (VCO) having an input for receiving an analog input signal; a double binary counter having a first input coupled to a first output of the VCO, a second input coupled to a second output of the VCO; a first set of registers coupled to the first output of the double binary counter; a second set of registers coupled to the second output of the double binary counter; sense amplifiers coupled to the outputs of the VCO; and a correction component coupled to the first set of registers, the second set of registers, and the sense amplifiers, wherein the correction component generates a coarse count, a fine count, and combines the coarse count and the fine count to provide a digital output signal representative of the analog input signal.

Abstract: An analog-to-digital converter includes a ring oscillator having an input for receiving an analog signal, a coarse counter including a maximum length sequence generator having an input coupled to the output of the ring oscillator, a fine counter including a Johnson counter having an input coupled to the output of the ring oscillator, and a difference generator having a first input coupled to the output of the coarse counter, a second input coupled to the output of the fine counter, and an output for providing a digital signal corresponding to the analog signal.

Abstract: An analog-to-digital converter includes a ring oscillator having an input for receiving an analog signal, a coarse Gray code counter having a first input coupled to a first output of the ring oscillator and a second input for receiving a clock signal, a fine counter having first inputs coupled to secondary outputs of the ring oscillator and a second input for receiving the clock signal, a first difference generator having an input coupled to the output of the coarse counter, a second difference generator having an input coupled to the output of the fine counter, and an adder having a first input coupled to the output of the first difference generator, a second input coupled to the output of the second difference generator, and an output for providing a digital signal corresponding to the analog signal.