Sample-and-hold circuit including push-pull transc

专利名称：Sample-and-hold circuit including push-pull

transconductance amplifier and currentmirrors for parallel feed-forward slewenhancement and error correction

发明人：Dwight D. Birdsall,Lloyd F. Linder,Phillip L.

Elliott

申请号：US08/018856申请日：19930205公开号：US05378938A公开日：19950103

摘要：A transconductance push-pull amplifier (20) generates primary push- pullcurrents (I1, I2) corresponding to a voltage input signal (VIN) . Current mirrors (42,44)generate secondary push-pull currents (I3, I4) corresponding to the primary push-pullcurrents (I1, I2). For sampling, both the primary and secondary push-pull currents (I1, I2,I3, I4) are applied to charge a capacitor (C3) in a current feed-forward arrangement withhigh slew rate and fast signal acquisition to produce a voltage output signal (VOUT). Thecapacitor (C3) is disconnected from the amplifier (20) and current mirrors (42,44) to holdthe output signal (VOUT). Switching transistors (Q13, Q15) which are connected betweenthe capacitor (C3) and the current mirrors (42,44) have substantially the same non-linearmodulation characteristics as corresponding output transistors (Q7, Q8) in the amplifier(20). The output and switching transistors (Q7, Q8, Q13, Q15) are connected to modulateout-of-phase such that non-linear modulation of the primary push-pull currents (I1, I2) bythe output transistors (Q7, Q8) is canceled by non-linear modulation of the secondary

push-pull currents (I3, I4) by the switching transistors (Q13, Q15), and the output signal(VOUT) is a highly linear replica of the input signal (VIN).

申请人：HUGHES AIRCRAFT COMPANY

代理人：Georgann S. Grunebach,Terje Gudmestad,W. K. Denson-Low

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