OP177FP datasheet(10/12 Pages) AD

10 / 12 page

OP177

REV. B

–10–

BILATERAL CURRENT SOURCE

The current sources shown in Figure 28 will supply both

positive and negative current into a grounded load.

Note that ZO =









+ R4

–

and that for ZO to be infinite,

+ R4

must

PRECISION ABSOLUTE VALUE AMPLIFIER

The high gain and low TCVOS assure accurate operation with

inputs from microvolts to volts. In this circuit, the signal always

appears as a common-mode signal to the op amps. The

OP177E CMRR of 140 dB assures errors of less than 1 ppm.

See Figure 29.

PRECISION POSITIVE PEAK DETECTOR

In Figure 30, the CH must be of polystyrene, Teflon*, or

polyethylene to minimize dielectric absorption and leakage. The

droop rate is determined by the size of CH and the bias current

of the OP41.

PRECISION THRESHOLD DETECTOR/AMPLIFIER

In Figure 32, when VIN < VTH, amplifier output swings nega-

tive, reverse biasing diode D1. VOUT = VTH if RL = ∞. When

VIN

≥ V

TH, the loop closes,

VOUT =VTH + VIN –VTH

() 1+ RF









CC is selected to smooth the response of the loop.

*Teflon is a registered trademark of the Dupont Company.

Figure 31. Precision Threshold Detector/Amplifier

Figure 30. Precision Positive Peak Detector

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