Patent ID: 6191639
Filing Date: 2001-02-20
Classification: G11C

Abstract:
In a gating circuit for analog signal values obtained in a periodic sequence, capacitively buffer-stored, digitized by an A/D converter and subsequently erased, before a next analog signal value is obtained, by discharge of said capacitive store within a time interval that is predetermined by a gating pulse, the improvement comprising, in combination:a) a first operational transconductance amplifier that can be activated by said gating pulse;b) a non-inverting input of said transconductance amplifier being connected to a reference-earth point of said capacitive store and the output of said amplifier being connected to a charging terminal of said capacitive store;c) an inverting input of said amplifier being connected through an impedance converter and a discharge-current variable resistor to said charging terminal of said capacitive store;d) a second operational transconductance amplifier through which said analog signal values pass to said charging terminal of said capacitive store; ande) the gain of said second amplifier being the ratio of the value of a resistor connected in parallel with said capacitive store to that of a series resistor that determines the potential at the inverting input of said second amplifier.