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LT3082/LT3092 500+kHz disturb causes output offset.

Category: Hardware
Product Number: LT3082

We are using the LT3082 in current source configuration for an ICP sensor (4.5mA). The bandwidth of the signal is < 1KHz. We have a problem that when high frequency noise (500kHz-1MHz) is coupled to the output of the LT3082, the regulator generate low frequency noise, like it demodulates the noise signal. (Low frequency noise is in band so it affects our signal processing).

With reference to the LT3092 datasheet we started with the circuit of Figure 1: "Using the LT3092 as a Current Source". Then we tried to follow the directions in paragraph "Stability and Frequency Compensation", so we added a 1nF capacitor parallel to RSET and another (Ccomp) between in and out, but it only get worse.


  1. Are LT3082 and LT3092 the same component? If not, what are the differences in our application?
  2. Why our circuit is so sensitive to high frequency noise? What can we do to avoid this behaviour.

Best regards