For the purpose of reducing the size and power consumption of a power source in an ultrasonic diagnostic apparatus, charge pump circuits are connected to a transmitter power source. A regulator in the transmitter power source drives the charge pump circuit to generate a positive bias voltage +HV2 higher...http://www.google.com/patents/US7351204?utm_source=gb-gplus-sharePatent US7351204 - Ultrasonic diagnostic apparatus
