Sample-and-hold circuit including push-pull transconductance amp

Details Sample-and-hold circuit including push-pull transconductance amp Sample-and-hold circuit including push-pull transconductance amp

1993-02-05

1995-01-03

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 91, 327379, H03K 5159, H03K 17687

Patent

active

053789385

ABSTRACT:
A transconductance push-pull amplifier (20) generates primary push-pull currents (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-pull currents (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 with high slew rate and fast signal acquisition to produce a voltage output signal (VOUT). The capacitor (C3) is disconnected from the amplifier (20) and current mirrors (42,44) to hold the output signal (VOUT). Switching transistors (Q13, Q15) which are connected between the capacitor (C3) and the current mirrors (42,44) have substantially the same non-linear modulation characteristics as corresponding output transistors (Q7, Q8) in the amplifier (20). The output and switching transistors (Q7, Q8, Q13, Q15) are connected to modulate out-of-phase such that non-linear modulation of the primary push-pull currents (I1, I2) by the 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).

REFERENCES:
patent: 4502020 (1985-02-01), Nelson et al.
patent: 4659945 (1987-04-01), Metz
patent: 4780689 (1988-10-01), Saller et al.
patent: 4783602 (1988-11-01), Viswanathan
patent: 4970470 (1990-11-01), Gosser
patent: 5124576 (1992-06-01), Jensen
"A 1.2-.mu.m BiCMOS Sample-and-Hold Circuit with a Constant-Impedance, Slew Enhanced Sampling Gate:," M. Wakayama et al., in IEEE Journal of Solid State Circuits, vol. 27, No. 12, Dec. 1992, pp. 1697-1708.

Affiliated with

Also associated with

Rating

Sample-and-hold circuit including push-pull transconductance amp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sample-and-hold circuit including push-pull transconductance amp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sample-and-hold circuit including push-pull transconductance amp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2213153