G - Physics
11
C
328/171
G11C 27/02 (2006.01)
Patent
CA 1252833
22 Abstract A high frequency sample and hold circuit has a sampling diode bridge for coupling an input test signal to be sampled to a holding capacitor when all of the diodes of the bridge are forward biased by an applied strobe signal, thereby charging the capacitor to the input voltage. The diode bridge substantially uncouples the input signal from the holding capacitor when the strobe current direction is reversed such that the holding capacitor retains the charge stored thereon and therefore remains charged to the current sample signal voltage at the instant the strobe current reverses direction. Any holding capacitor charging current generated by the sampling bridge as it returns to equilibrium after strobe current reversal is offset by a holding capacitor charging current of substantially equal magnitude and opposite phase generated by a compen- sating bridge. The compensating bridge has capacitive coupling characteristics substantially matching those of the sampling bridge and produces the reverse phase charging current either as a result of an applied input signal being of reverse phase to the sampling bridge input signal or as a result of an applied strobe current being of reverse phase to the sampling bridge strobe signal.
502648
Kirby Eades Gale Baker
Tektronix Inc.
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