A transmit pulser includes an H-bridge of four transistors. First and second transistors of the H-bridge connect with a first
electrode of a
transducer element, and third and fourth transistors of the H-bridge connect with a second
electrode of the
transducer element. A differential receive
amplifier connects with the first and third transistors. First and second
diode clamps connect with the first and third transistors, respectively, and the inputs to the differential receive
amplifier. The second and fourth transistors connect to a same power or
voltage source, imposing a same
voltage in either a forward or a reverse direction. By using matched
transistor pairs (e.g. first and third
matched pair and second and fourth
matched pair), symmetrical transmit waveforms are generated. Symmetrical transmit waveforms allow for using
phase inversion or phase differences between transmit waveforms for imaging, such as for
harmonic imaging of tissue. The spectral content of symmetrical waveforms is narrower or includes less
harmonic information.