in pairs the center tap of the primary winding is connected with a high voltage power supply the secondary winding provides the transmitter output the transformer may have a step down or a step up winding ratio there is a transmit controller aimed to support beamformation the controller comprises a sine cosine look up table lut 609 two multiplying dacs 611 612 and a conventional dac 610 in operation the lut converts the input value of the phase angle into two digital words representing the sine and cosine function of said phase angle and deliver it to said multiplying dacs the multiplying dacs provide the multiplication factors for phase rotation in the analog form the apodization value is directly applied to the dac 610 its output provides the reference voltage for both multiplying dacs 611 and 612 thus the amplitude of current pulses generated by said modulators 601 602 is directly proportional to the product of said phase rotating and apodization factors since the gate voltage in fig6 is formed as a product of phase rotating and apodization factors it may have a wide dynamic range consequently the threshold voltage tolerance of the transistor amplifiers may degrade the accuracy of beamformation in view of that the second embodiment shown in fig5 introduces a different architecture fig5 depicts the second embodiment 500 comprises two identical pulse height and width multipliers 501 520 a transmit controller 570 and an output multiplier 580 each of the phwms 501 and 520 comprises two identical programmable current drivers 530 540 and 550 560 interface and architecture of these drivers are shown in fig7 referring to the phwm 501 the first and second clock terminals 504 506 of the.