Wideband Current Feedback OPA GX811 in Medical Testing, Replacing AD811

Operational amplifiers are mainly responsible for further filtering, modulation, etc. in signal processing to ensure signal stability and accuracy. This plays a key role in suppressing noise, eliminating interference, and improving signal quality.

With the continuous development of modern medical technology, the demand for medical instruments is increasing, and the basic electronic components such as operational amplifiers also put forward more special and strict requirements. Operational amplifiers play a crucial role in medical instruments, and their performance directly affects the accuracy and reliability of the entire medical equipment. If the medical equipment for operational amplifiers in high precision, low power consumption, anti-interference and other aspects of the special requirements, we recommend the use of GXSC‘s broadband current feedback operational amplifier GX811, the chip can replace the AD811, there is a certain price advantage.

GXSC‘s current feedback type operational amplifier GX811 has a -3dB bandwidth of 120MHz, a gain of +2, and a differential gain and phase of 0.01% and 0.01° (RL=150Ω), making the GX811 an excellent choice for medical testing.

The GX811 is designed with the following features: 35MHz bandwidth (G=+2); 0.1dB gain flatness specification; and small differential gain and phase errors. 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 ±5V to ±15V. 

The GX811 is also well suited for high-speed pulse applications. It can achieve a maximum slew rate of greater than 2500V/μs, with a build-up time of less than 25ns for 0.1% of a 2V step, and less than 65ns for 0.01% of a 10V step. The GX811 is ideally suited to be used as an ADC or DAC buffer in a data acquisition system because of its low distortion and wide unity-gain bandwidth of up to 10MHz.

In summary: The GX811 is a current-feedback amplifier: it has a wide bandwidth; low voltage and current noise of 1.9nV/√Hz and 20pA/√Hz, respectively; low input distortion voltage; and is suitable for wide dynamic range applications.