500-019 System Features:

	4 channels
	60 Watts Maximum Power per Channel
	Frequency Operating Range of 1.2 - 1.8 MHz
	Custom frequency ranges available
	Forward and reflected power monitoring
	Proprietary Feed back Controlled Channel
	Independent Phase Shifting
	Unique integrated forward power feedback for precise power delivery
	Parallel port interface
	Portable Bench-top case

The 500-019 is a 4-channel high power, ultrasound phased-array transducer driver. Capable of delivering 60W per channel continuously from 1.2 - 1.8 MHz with individual power control, the 500-019 is capable of driving a wide variety of ultrasonic devices. A precision power leveling circuit precisely delivers the desired forward power into the load, regardless of the load impedance (within the operating range of the amplifier). The precision power measurement capability allows the continual monitoring of the forward and reflected RF power. For high speed applications, such as hydrophone measurements, a voltage feedback mode of the amplifiers allows the production of pulses on the order of 10 cycles. Fault detection circuitry protects the amplifiers from a whole array of faults ranging from shorted outputs to badly mismatched or open circuit outputs.

The 500-019 four channel Phased Array RF Generator is controlled by a host PC running Microsoft Windows. A 25-pin “D-sub” (parallel printer cable) connects between the PC and the RF Generator. The Phased Array Interface software controls all aspects of the RF Generator’s operation.

 

500-019 Specifications

Parameter	Value
Amplifier
Number of Channels	4 ch
Frequency Range	1.2- 1.8 MHz
Output Power per Channel	60 Watts Max.
Total RF Output Power	320Watts
Power Control Resolution	bits (non-linear)
Power Control Accuracy	±3%
Power Measurement
Resolution	8bits (<0.04 W)
Accuracy	±3%
Phase Control
Range	0-360 °
Resolution	1.7° @  1.2MHz 2.6° @  1.8MHz

Power Control

Each amplifier channel is integrated with a dual-directional coupler (DDC) allowing high precision monitoring of forward and reflected RF power. Each side of the DDC is connected to a high precision power meter, and the forward side power meter is inserted directly into the feedback loop of the amplifier. Power leveling based on the forward power is a unique feature of our amplifiers which allows for precise delivery of power to the ultrasound transducers.

While the actual power control is specified as 8 bits, nonlinear, the embedded controller allows the power to be set in terms of watts, rather than bit values.  Thus the actual bits of power control resolution are not seen by the user.

Phase Control

Channel independent phase control allows each amplifier to be set at any phase between 0 ° and 360 ° relative to the externally available system reference clock, regardless of the phase of any other channel in the system. The phase control circuitry precisely controls the phase at the transducer surface, regardless of phase shifts caused by impedance matching circuitry.

Intelligent Control and Monitoring

Each four amplifier channels include a dedicated microcontroller responsible for communicating with the main embedded controller, controlling output power and phase independently for each of the four channels, and monitoring the forward and reflected power delivered by each amplifier channel.

Enclosures

 The 500-012 is encased in a 15.5" x 7.5" x 13.5" bench-top enclosure with an adjustable handle. The RF signals are terminated with BNC connectors.

System Architecture

The figure shown below illustrates a single channel of the ultrasound driving system. Each microcontroller actually controls four driving channels, and controls the power and phase of the driving system. Dual directional couplers measure the forward and reflected power which is continuously monitored by the microcontroller. A unique feature of the driving system is that the output power is controlled by programming the forward power, which is the basis for the feedback rather than a voltage. This is very useful for therapeutic ultrasound drivers since the deposited power is directly proportional to the RF power, while the output power at a constant voltage can vary from transducer to transducer. The electrical signal is then isolated by the isolation transformer.

The amplifiers are controlled by a single board embedded computer. The function of this computer is to handle all of the interfacing between the host system and the amplifiers as well as the monitoring and safety aspects of the operation.

Single Channel Block Diagram

System Programming/Interfacing

Control of the 500-019 system is accomplished through the parallel port. Included with the base system is a Microsoft Windows® based interface to the System. This program allows programming of all features of the system. To ease in configuring a custom interface, the source code for this interface is included at no extra charge. In addition, Advanced Surgical Systems will work with its customers for software development.

 

Warranty and Support

The 500-019 will be warranted for a period of one year, including all parts and labor, providing the system is operated within the specified operating range. Additionally, Advanced Surgical Systems is willing to work with its customers to make sure that the equipment is used to its maximum potential, whether this be regarding interfacing with the transducers, developing control software, or any other issues that may arise throughout the lifetime of the 500-019 system. Throughout the life of the product, technical support is available at no charge.

Pricing

The systems as quoted consist only of the systems described herein. Any modifications may affect the actual pricing. Please be advised that the pricing information shown here is not to be considered a formal quote. For a formal quote, please contact Advanced Surgical Systems, Inc.

Description	SKU #	Price
500-019 Generator	500-019	$CALL

Price excludes freight and insurance.