An apparatus comprising: an integrated circuit configured to be operatively coupled to a sensor array that includes pixels and that is configured to generate an ultrasonic wave, wherein the integrated circuit includes: a bias generation module for generating a bias signal, the bias signal having one of at least a block value and a sample value, the sample value having a smaller amplitude than the block value, the bias signal having a block value for a duration dependent upon at least one of a thickness of a component of the sensor array, a duration of an enable signal and a frequency of the enable signal, the bias signal having the sample value for a duration dependent upon at least one of a duration of the enable signal and a frequency of the enable signal; a first terminal to output the bias signal; a transmitter circuit configured to provide a first signal to the sensor array; and a receiver circuit configured to receive a second signal from the sensor array in response to providing the first signal, wherein the sensor array includes: an ultrasonic transmitter configured to generate the ultrasonic wave in response to the first signal; a piezoelectric receiver layer configured to detect a reflection of the ultrasonic wave; and a bias electrode configured to bias the piezoelectric receiver layer with one of a block signal based on the bias signal when this has the block value causing the piezoelectric receiver layer to operate in a block mode in which reception of the ultrasonic wave is inhibited, and a smaller amplitude sample signal based on the bias signal when this has the sample value causing the piezoelectric receiver layer to operate in a sample mode in which reception of the ultrasonic wave is enabled. an integrated circuit configured to be operatively coupled to a sensor array that includes pixels and that is configured to generate an ultrasonic wave, wherein the integrated circuit includes: a bias generation module for generating a bias signal, the bias signal having one of at least a block value and a sample value, the sample value having a smaller amplitude than the block value, the bias signal having a block value for a duration dependent upon at least one of a thickness of a component of the sensor array, a duration of an enable signal and a frequency of the enable signal, the bias signal having the sample value for a duration dependent upon at least one of a duration of the enable signal and a frequency of the enable signal; a first terminal to output the bias signal; a transmitter circuit configured to provide a first signal to the sensor array; and a receiver circuit configured to receive a second signal from the sensor array in response to providing the first signal, a bias generation module for generating a bias signal, the bias signal having one of at least a block value and a sample value, the sample value having a smaller amplitude than the block value, the bias signal having a block value for a duration dependent upon at least one of a thickness of a component of the sensor array, a duration of an enable signal and a frequency of the enable signal, the bias signal having the sample value for a duration dependent upon at least one of a duration of the enable signal and a frequency of the enable signal; a first terminal to output the bias signal; a transmitter circuit configured to provide a first signal to the sensor array; and a receiver circuit configured to receive a second signal from the sensor array in response to providing the first signal, wherein the sensor array includes: an ultrasonic transmitter configured to generate the ultrasonic wave in response to the first signal; a piezoelectric receiver layer configured to detect a reflection of the ultrasonic wave; and a bias electrode configured to bias the piezoelectric receiver layer with one of a block signal based on the bias signal when this has the block value causing the piezoelectric receiver layer to operate in a block mode in which reception of the ultrasonic wave is inhibited, and a smaller amplitude sample signal based on the bias signal when this has the sample value causing the piezoelectric receiver layer to operate in a sample mode in which reception of the ultrasonic wave is enabled. an ultrasonic transmitter configured to generate the ultrasonic wave in response to the first signal; a piezoelectric receiver layer configured to detect a reflection of the ultrasonic wave; and a bias electrode configured to bias the piezoelectric receiver layer with one of a block signal based on the bias signal when this has the block value causing the piezoelectric receiver layer to operate in a block mode in which reception of the ultrasonic wave is inhibited, and a smaller amplitude sample signal based on the bias signal when this has the sample value causing the piezoelectric receiver layer to operate in a sample mode in which reception of the ultrasonic wave is enabled.