Q1A should be about ten times the base current of Q2A. The
base current of the output op amp should be no more than
1/1000 of the emitter current of Q2. The values of R1 and R2
should be the same as R7.
Various formulae for noise:
Voltage noise of a transistor,
Current noise of a transistor,
Voltage noise of a resistor, per
For a more complete analysis of low-noise amplifiers, see
AN-222, “Super Matched Bipolar Transistor Pair Sets New
Standards for Drift and Noise”, Carl T. Nelson.
00849902
*
Tracking TC
<
5 ppm/˚C
<
5 ppm/˚C, Beckman 694-3-R100K-D or similar
**
Solid tantalum
***
Tracking TC
FIGURE 2. New Low-Noise Precision Operational Amplifier as Gain-of-1000 Pre-Amp
www.national.com
2
Notes
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