Patent ID: 8804457

Claim:
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.