| 摘要 |
A unity gain amplifier of the diamond follower type provides the combination of negligible input offset voltage, high slew rate, and high bandwidth by providing first and second opposite polarity current mirror circuits which respond to currents flowing through first and second input transistors to boost current available to charge parasitic capacitances during fast rise times and fast fall times of an input pulse. The rapid charging and discharging of the parasitic capacitances eliminates degradation in the rise and fall times of an output pulse produced by the unity gain amplifier. The gains of the first and second current mirror circuits have values that result in critically damped high frequency response of the unity gain amplifier in response to high speed transistions of the input signal. Darlington output stages are used to avoid frequency response peaking due to current gain rolloff of the output transistors at high currents and high frequencies. The unity gain amplifier is used in high performance operational transconductance amplifier.
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