The feedback loop includes a charging circuit or a discharging circuit depending upon the function of the op amp clamp. The feedback loop may be arranged with a current mirror in which current generated by the output of the differential amplifier is mirrored in the charging or discharging ...
Circuit protection of ADC inputs from overvoltages.The ADC inputs suffer when the driving amplifier rails are considerably higher than the ADC max input range. The most common is to use Schottky diodes to clamp the output of the amplifier. Such diodes disclose capacitance, the leakage current ...
If the supply rail is high impedance when turned off, and the circuit is relying on the Zener diodes to clamp the op amp voltage, it is possible for the op amp to self-power through the protection diodes. Whatever IC follows the amplifier must be able to tolerate a voltage being present...
Diode clamp: (a) test circuit and (b) simulation test results. The test circuit was set up using the generic diode provided in the VSM simulator and some sample readings were taken. We can see that the diode voltage drop increases in equal steps above 30 µA, within about 2%. This ...
A final circuit in Figure 13 shows how two op amps can be stacked to double output swing. A third op amp with a gain of 0.5 added to the output will triple the basic swing. Any num- ber of op amps can be cascaded, adding to the swing, but a floating supply is required for each...
If the quiescent voltage on the balance terminals is such that the LM11 can drive directly, the circuit in Figure 8(b) can be used. A clamp diode from the other balance terminal to internal circuitry of the LM11 keeps the output from swinging too far from the null value, and a ...
transistors. Protective circuitry such as current limiting resistors and clamp diodes, as shown in figure 4.13, are often integrated between the input pins and the sensitive input transistors. This protection circuit will greatly lower the input impedance for differential input voltages greater than +/...
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This circuit simulates the anti-phase reversal common mode clamping present in most (but not all) LTC PFET input amplifiers. In the actual parts which use it, this clamp becomes active whenever the input voltage approaches within 4V (or less) of the negative supply rail. This pre- vents ...
RL = 10kΩ V+ = 5V V+ = 30V ISOURCE Output Current Sourcing ISINK Output Current Sinking IO Output Short Circuit to Ground (Note 2) SR Slew Rate GBW Gain Bandwidth Product φm Phase Margin VID = +1V, V+ = 15V, VO = 2V VID = −1V V+ = 15V, VO = 2V VID = −1V ...