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By Smith, D.L.; Argonne National Lab.; United States. Dept. of Energy. Office of Scientific and Technical Information

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Extra info for Prompt air-scattering corrections for a fast-neutron fission detector : E/ sub n/ less than or equal to 5 MeV

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1 Auto-zero offset-stabilized amplifiers A diagram of a system using auto-zero offset-stabilization is shown in figure 3-3. During phase F2 the stabilizing amplifier Gn samples its own offset voltage. In this phase stabilizing amplifier Gn measures its own offset voltage and stores an offset compensating voltage on capacitor C1. 3, the residual offset due to finite gain of Gn can then be expressed as: Vn Vosn, res, gain = ---------------, 1 + An2 (3-2) where An2 is the DC gain of Gn2, which acts as an auxiliary input of the stabilizing amplifier Gn.

2-14 Charge injection model in a chopper amplifier. 27 Dynamic Offset Compensation Techniques Va VFc Vin offset Fig. 2-15 Illustration of residual offset caused by demodulated spikes caused by a mismatch between C1 and C2. Therefore, each time the chopper clock switches charge is being injected into the input, this differential charge can be expressed by: qinj = (C1 –C2 )VF , (2-18) where VF is the driving voltage of clock VFC. This charge is applied two times the per clock period. This means that a current will run through the resistors R1 and R2.

In this dead-band or guard-band approach, the output voltage is not modulated while the spike is present. 14] for custom read out electronics for sensors. 21], an amplifier with an average 200 nV input offset was realised. 14] a nested chopper technique was used. This implementation used a guard-band for the inner chopper and a partially digitally-implemented FM V - in FM + M Va - Va A1 t b - D FD - + Vout Vb + 1 0 -1 FD 1 0 -1 + 1 0 -1 Vout a FM Va FD 1 0 -1 Vout t c Fig. 2-25 (a) Modulated amplifier, (b) delayed demodulation clock diagram, (c) dead band clock diagram.

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