RECEPTION AND TRANSMISSION CIRCUIT FOR A CAPACITIVE MICROMACHINED ULTRASONIC TRANSDUCER

摘要

Described herein is a transceiver circuit for a capacitive micromachined ultrasonic transducer (CMUT), provided with: a transmitter stage, which generates excitation pulses for a first node of the CMUT transducer during a transmitting phase, a second node of the CMUT transducer being coupled to a biasing voltage; a receiver stage that is selectively coupled to the first node during a receiving phase and has an amplification stage; a switching stage that couples the receiver stage to the first node during the receiving phase and decouples the receiver stage from the first node during the transmitting phase. The amplification stage is provided with a charge amplifier that has an input terminal and is biased as a function of a biasing voltage; and the switching stage is coupled to the same biasing voltage thereby minimizing an injection of charge into the input terminal upon switching from the transmitting phase to the receiving phase.

主权项

1. A device, comprising:
a transmitter configured to generate an excitation signal for a first node of a transducer during a transmitting phase, a second node of said transducer being coupled to a biasing voltage terminal; a receiver including a charge amplifier having an input terminal and biased as a function of an amplifier biasing voltage; and switching circuitry coupled to the amplifier biasing voltage and configured to:
generate a pre-charge biasing voltage based on the amplifier biasing voltage during a pre-charge phase;couple the receiver to said first node during a receiving phase; anddecouple the receiver from said first node during the transmitting phase.