An ultrasound system, comprising: a set of ultrasound transducer devices comprising an array of rows and columns of transducer devices, each device comprising one or more capacitive micro-machined ultrasound transducer, CMUT, cells each having first and second terminals (214,216); a first drive circuit for operating the ultrasound transducer devices, said circuit arranged to deliver an AC drive signal and receive a reflected signal at a drive circuit port associated with at least one of the ultrasound transducer devices, wherein the first drive circuit comprises an ASIC; and a first intermediate circuit between the drive circuit and the set of ultrasound devices, wherein the intermediate circuit comprises an array of coupling circuits, each coupling circuit coupling the drive circuit port and the associated at least one ultrasound transducer device, and comprising only a buffer element comprising a resistor connected between a bias voltage terminal and the first terminal, and a capacitor in series between the first terminal and the drive circuit port; a second drive circuit arranged to deliver an AC drive signal and receive a reflected signal at a second drive circuit port associated with at least one of the ultrasound transducer devices, wherein the second drive circuit comprises an ASIC; and a second intermediate circuit between the second drive circuit and the set of ultrasound devices, wherein the second intermediate circuit comprises an array of coupling circuits, each coupling circuit between the second drive circuit port and the associated at least one ultrasound transducer device, and comprising only a buffer element comprising a resistor connected between a bias voltage terminal and the second terminal and a capacitor in series between the second terminal and the second drive circuit port, wherein each port of the first drive circuit connects to the first terminals of a row of ultrasound transducer devices through the first intermediate circuit; and wherein each port of the second drive circuit connects to the second terminals of a column of ultrasound transducer devices through the second intermediate circuit. a set of ultrasound transducer devices comprising an array of rows and columns of transducer devices, each device comprising one or more capacitive micro-machined ultrasound transducer, CMUT, cells each having first and second terminals (214,216); a first drive circuit for operating the ultrasound transducer devices, said circuit arranged to deliver an AC drive signal and receive a reflected signal at a drive circuit port associated with at least one of the ultrasound transducer devices, wherein the first drive circuit comprises an ASIC; and a first intermediate circuit between the drive circuit and the set of ultrasound devices, wherein the intermediate circuit comprises an array of coupling circuits, each coupling circuit coupling the drive circuit port and the associated at least one ultrasound transducer device, and comprising only a buffer element comprising a resistor connected between a bias voltage terminal and the first terminal, and a capacitor in series between the first terminal and the drive circuit port; a second drive circuit arranged to deliver an AC drive signal and receive a reflected signal at a second drive circuit port associated with at least one of the ultrasound transducer devices, wherein the second drive circuit comprises an ASIC; and a second intermediate circuit between the second drive circuit and the set of ultrasound devices, wherein the second intermediate circuit comprises an array of coupling circuits, each coupling circuit between the second drive circuit port and the associated at least one ultrasound transducer device, and comprising only a buffer element comprising a resistor connected between a bias voltage terminal and the second terminal and a capacitor in series between the second terminal and the second drive circuit port, wherein each port of the first drive circuit connects to the first terminals of a row of ultrasound transducer devices through the first intermediate circuit; and wherein each port of the second drive circuit connects to the second terminals of a column of ultrasound transducer devices through the second intermediate circuit.