Operational amplifier GX811 replace AD811 medical ultrasound application program

Ultrasound medicine uses the propagation characteristics of high-frequency sound waves in human tissues for diagnosis and treatment. Sound waves propagate at different speeds and are absorbed to different degrees between different tissues, resulting in an ultrasound image. In order to obtain clear and accurate images, the use of high-power ultrasound signals. High-performance power amplifiers are used to enhance and amplify ultrasound signals.

The GX811 wideband current feedback type operational amplifier with -3dB bandwidth of 120MHz, +2 gain, differential gain and phase of 0.01% and 0.01° (RL=150Ω) makes the GX811 an excellent choice for medical ultrasound. The chip‘s performance is compatible with the AD811, with a certain price advantage and stable supply channels.

The GX811 is designed with the following features: 35MHz bandwidth (G=+2); 0.1dB gain flatness specification; small differential gain and phase error. This performance can be achieved with a low supply low current supply, whether driving one or two 75Ω cables. In addition, the GX811 is rated for supply voltages ranging from ±5 V to ±15 V. The chip is well suited for high-speed pulse applications. It can achieve a maximum slew rate of greater than 2500V/μs, with a 0.1% build-up time of less than 25ns for a 2V step, and a 0.01% build-up time of less than 65ns for a 10V step.

The GX811 can also be used as an ADC or DAC buffer in a data acquisition system because it has low distortion and wide unit gain bandwidth up to 10 MHz.The GX811 has a wide bandwidth with low voltage and current noise of 1.9nV/√Hz and 20pA/√Hz, respectively; low input offset voltage; and is suitable for wide dynamic range applications. The main performance of the chip is as follows:

- High speed

   140MHz bandwidth (3dB, G=+1)

   120MHz bandwidth (3dB, G=+2)

   35MHz bandwidth (0.1dB, G=+2)

- Voltage swing rate: 2500V/μs

   0.1% build-up time is: 25ns (2V step)

   0.01% build-up time: 65ns (10V step)

- Excellent video performance (RL=150Ω)

   0.01% differential gain, 0.01° differential phase

   Voltage noise: 1.9nV/√Hz

- Low distortion: THD=-74dB (at 10MHz)

- Low input distortion: 3mV

- Rated for ±5V and ±15V operating voltages