Transmit/receive systems for imaging devices
AssigneeMaxim Integrated Products, Inc.
InventorsLuigi Franchini, Roberto Alini, Filippo Cevini
Life of this patent
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Abstract
A transceiver for an ultrasonic imaging device includes a transmit circuit and a receive circuit. The transmit circuit outputs test pulses to a probe including a transducer to generate an image of a test object. A composite signal including the test pulses and a reflected signal is output by the transducer. The receive circuit receives the composite signal including the test pulses and the reflected signal and includes a filter circuit. The filter circuit filters the test pulses from the composite signal and passes the reflected signal. An impedance of the filter circuit is equal to substantially zero when the reflected signal is within a predetermined frequency range.
Claims18
A transceiver for an ultrasonic imaging device, comprising:
- a transmit circuit that outputs test pulses to a probe including a transducer to generate an image of a test object,
- wherein a composite signal including the test pulses and a reflected signal is output by the transducer;
- a receive circuit that receives the composite signal including the test pulses and the reflected signal and that includes a filter circuit that filters the test pulses from the composite signal and passes the reflected signal,
- wherein an impedance of the filter circuit is equal to substantially zero when the reflected signal is within a predetermined frequency range, and
- wherein the filter circuit includes a diode bridge;
- and
- a bias resistor connected between a bias voltage and the diode bridge,
- wherein a magnitude of the bias voltage is less than a magnitude of the test pulses, and
- wherein a maximum value of the reflected signal is less than the magnitude of the bias voltage.
A transceiver for an ultrasonic imaging device, comprising:
- a transmit circuit that outputs test pulses to a probe including a transducer to generate an image of a test object,
- wherein a composite signal including the test pulses and a reflected signal is output by the transducer;
- a diode bridge that receives the composite signal including the test pulses and the reflected signal and that filters the test pulses from the composite signal and passes the reflected signal,
- wherein each of the diodes of the diode bridge has a forward transit time that is greater than one divided by a product of 2π and a minimum value of a predetermined frequency range of the reflected signal;
- and
- a bias resistor connected between a bias voltage and the diode bridge,
- wherein a magnitude of the bias voltage is less than a magnitude of the test pulses, and
- wherein a maximum value of the reflected signal is less than the magnitude of the bias voltage.
A transceiver for an ultrasonic imaging device, comprising:
- a transmit circuit that outputs test pulses of a first magnitude to a probe including a transducer to generate an image of a test object,
- wherein a composite signal including the test pulses and a reflected signal is output by the transducer, and
- wherein a maximum magnitude of the reflected signal is less than the first magnitude;
- a diode bridge that receives the composite signal including the test pulses and the reflected signal and that includes diodes having forward transit times that are each greater than one divided by a product of 2π and a minimum value of a predetermined frequency range of the reflected signal;
- and
- a bias resistor connected between a bias voltage and the diode bridge,
- wherein a second magnitude of the bias voltage is greater than the maximum magnitude and less than the first magnitude, and
- wherein the diode bridge filters voltages of the composite signal that are greater than the bias voltage and passes voltages of the composite signal that are less than the bias voltage.
Dependencies are inferred from the claim text.