Stanford Research Systems SIM918, Operating And Service Manual

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2 Description of Operation
This chapter provides a number of additional details of the operation
of the SIM918.
In This Chapter
2.1 About Transimpedance Amplifiers . . . . . . . . . . 2 – 2
2.1.1 Input capacitance and stability . . . . . . . . . 2 – 2
2.1.2 Choosing the right gain . . . . . . . . . . . . . 2 – 3
2.2 Bias and Ground . . . . . . . . . . . . . . . . . . . . . 2 – 4
2.2.1 Grounds . . . . . . . . . . . . . . . . . . . . . . 2 – 4
2.2.2 Bias . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 4
2.3 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 5
2.4 Autozero Trim . . . . . . . . . . . . . . . . . . . . . . . 2 – 5
2.5 Phase-Locked Loop . . . . . . . . . . . . . . . . . . . . 2 – 6
2.6 Autocalibration . . . . . . . . . . . . . . . . . . . . . . 2 – 6
2.7 Clock Stopping . . . . . . . . . . . . . . . . . . . . . . 2 – 7
2.8 Quiescent Operation . . . . . . . . . . . . . . . . . . . 2 – 8
2 – 1