That is, using the diodes, the signal distortion level at 80 mV of differential input is the same as that of the simple differential amplifier at a differential input of 20 mV . Second, the action of the biased diodes offsets much of the temperature sensitivity of the OTA's transconductance.
32.
Specific ultra-fast comparators, like the LMH7322, allow input signal to swing below the negative rail " and " above the positive rail, although by a narrow margin of only 0.2 V . Differential input voltage ( the voltage between two inputs ) of a modern rail-to-rail comparator is usually limited only by the full swing of power supply.
33.
Encouraged by George A . Philbrick, who was part of the Division 7 team, Julie designed a circuit using two dual-triode vacuum tubes that not only had the novel feature of a differential input, but used fewer tubes, was much faster ( 100 kHz gain-bandwidth product ) and more power efficient ( 2 ?300 V at 10 mA, plus tube heater ) than the previous circuits.
