Besides power dissipation, a secondary but no less important aspect of feedback impedance is loading of the op amp rail-to-rail output stage. Heavier loading, such as between 1K and 10K impedance, significantly lowers open loop gain, in turn affecting the accuracy of the bandpass f...
This paper describes a 1-V wide-input range and high linearity transconductance input stage that uses poly resistor and input-impedance boosting technique. Using the proposed transconductor, an op amp and a differential difference amplifier (DDA) were implemented in a 1.2-/spl mu/m CMOS process...
This may again seem obvious, but there is an erroneous belief that because feedback reduces the output impedance of an op-amp in proportion to the ratio of open- to closed-loop gains, it should be capable of driving very low–load resistors. Well, of course, to an extent it is, but ...
The IC can be configured such that the multiple op amps are connected in parallel to form a single op amp having output drive and input-referred noise characteristics which are superior to those of the constituent op amps. The IC can be fabricated with either first or second metallization ...
The IC can be configured such that the multiple op amps are connected in parallel to form a single op amp having output drive and input-referred noise characteristics which are superior to those of the constituent op amps. The IC can be fabricated with either first or second metallization ...
Figure 1. Adding a low-power op amp buffer (IC1) to the output of a high-impedance pH probe allows use of ordinary coaxial cable in place of the expensive Teflon cable otherwise required. If desired, you can install the op amp and its power supply (a small lithium battery) within the...
A field-effect transistor (FT) which is driven via a coupling capacitor (C4) from an operational amplifier (OP) having a low-impedance output is used as an electronic switch of a switched-mode regulator. The operating point of the field-effect transistor is defined by a diode which is conn...
The capacitive-load drive of the TLV900x family is 500 pF, and the resistive openloop output impedance makes stabilization easier with much higher capacitive loads. These op amps are designed specifically for low-voltage operation (1.8 V to 5.5 V)...
In higher-speed applications, newer ADCs like the AD4000 or AD4696 families offer high input impedance (high-Z) modes that allow lower bandwidth (and lower power) amplifiers to drive the analog inputs, sometimes even eliminating the driver altogether. Removing this op-amp will also contribute ...
Low Cost, Low Power Video Op Amp AD818 FEATURES Low Cost Excellent Video Performance 55 MHz 0.1 dB Bandwidth (Gain = +2) 0.01% and 0.05؇ Differential Gain and Phase Errors High Speed 130 MHz Bandwidth (3 dB, G = +2) 100 MHz Bandwidth (3 dB, G+ = –1) 500 V/s Slew ...