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ADMV1011 Fixed Bias Power Up Sequence

Thread Summary

The user inquires about the risk of damage to the ADMV1011 when using fixed gate voltages (VGRF1 at -2.5V, VGRF2 at -2.4V) and fixed control voltages (VCTL2 and VCTL3 at -3.5V) instead of active bias control. The final answer confirms that this approach is acceptable as long as the voltages remain within the Absolute Max ratings. No specific risks of damage are noted.
AI Generated Content
Category: Datasheet/Specs
Product Number: ADMV1011

The following bias sequence is called out in the ADMV1011 datasheet for the evaluation board:

Take the following steps to turn on the EVAL-ADMV1011:

  1. Power up VGRF1 and VGRF2 with a −1.8 V supply.
  2. Power up VCTL2 and VCTL3 with a −5 V supply for maximum conversion gain.
  3. Power up VDRF1 and VDRF2 with a 5 V supply.
  4. Power up VDLO with a 3.5 V supply.
  5. Adjust the VGRF1 supply between −1.8 V to −0.8 V until IDRF1 = 220 mA.
  6. Adjust the VGRF2 supply between −1.8 V to −0.8 V until IDRF2 = 75 mA.

In my application, I do not have active bias control to tune IDRF1 and IDRF2 on every power up. Instead I rely on fixed gate voltage for every unit. This gets my bias close to the desired level i.e. VGRF1 always powers up to -2.5V and VGRF2 powers up at -2.4V. Likewise, I fix VTCL2 and VCTL4 to -3.5V. So my sequence looks like:

  1. Power up VGRF1 at -2.5V and VGRF2 = -2.4V.
  2. Power up VCTL2 and VCTL3 with a −3.5 V supply for maximum conversion gain.
  3. Power up VDRF1 and VDRF2 with a 5 V supply.
  4. Power up VDLO with a 3.5 V supply.

Are there any risk for damage to the ADMV1011 using this approach?

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