Ultrasonic receiver front-end

摘要

In certain embodiments, systems for receiving one or more echoes are provided. The system comprises a first attenuator, a first amplifier, and a second attenuator. The first attenuator is configured to receive the one or more echo signals, and generate a corresponding set of first attenuated echo signals, respectively, based on a number of signal strengths of the one or more echo signals. The first amplifier is configured to receive and amplify the set of first attenuated echo signals to thereby generate a set of first amplified echo signals corresponding to the one or more first attenuated echo signals, respectively. The second attenuator is configured to receive the set of first amplified echo signals and generate a set of second attenuated echo signals corresponding to the set of first amplified echo signals, respectively, based on a number of signal strengths of the set of first amplified echo signals, respectively.

主权项

1. A system comprising:
a first attenuator configured to receive one or more echo signals and generate a set of first attenuated echo signals corresponding to the one or more echo signals, respectively, based on a number of signal strengths of the one or more echo signals, respectively; a first amplifier configured to receive and amplify the set of first attenuated echo signals to thereby generate a set of first amplified echo signals corresponding to the one or more first attenuated echo signals, respectively; and a second attenuator configured to receive the set of first amplified echo signals and generate a set of second attenuated echo signals corresponding to the set of first amplified echo signals, respectively, based on a number of signal strengths of the set of first amplified echo signals, respectively, wherein the first attenuator comprises: a buffer comprising a first input terminal, a second input terminal and an output terminal, the first input terminal coupled with a an input resistor and the second input terminal coupled with the output terminal of the buffer, the input resistor configured to receive the one or more echo signals; a capacitor comprising a first terminal and a second terminal, the first terminal coupled with the output terminal of the buffer, and the second terminal being coupled with a voltage reference point; and a variable shunt resistor coupled with the capacitor, whereby the buffer and the capacitor configures a low pass filter, and a value of the first variable shunt resistor varies based on the number of signal strengths of the one or more echo signals to thereby vary the attenuation provided by the first attenuator.