Patent ID: 9731323
Date: 2017-08-15
CPC Classifications: A61B,B06B,G01S

Claim:
1. A transmitter circuit for delivering a transmitter output waveform to a transducer element; said circuit comprising: a switching amplifier operable to produce a portion of the transmitter output waveform for said transducer element, the switching amplifier including: a return to zero circuit that includes a number of variable strength transistors to pull the transmitter output waveform to zero; and a controller configured to enable one or more of the number of variable strength transistors in the switching amplifier such that the output of the amplifier is pulled to the negative or positive supply rail with a slope that matches the first slope and to enable one or more of the number of variable strength transistors in the return to zero circuit in order to control a slope at which the transmitter output waveform returns to zero in order to mitigate second-order harmonics from being generated by said transducer element.