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LOW LEAKAGE CURRENT ZENER DIODE CIRCUIT

IP.com Disclosure Number: IPCOM000006287D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-20
Document File: 1 page(s) / 51K

Publishing Venue

Motorola

Related People

B. A. Snodgrass: AUTHOR [+2]

Abstract

Figure 1 illustrates circuit 10 providing a low-power This impedance increases when the voltage on power voltage clamp in battery-backed RAM circuitry, Circuit bus 12 returns to acceptable levels and circuit 10 returns 10 consumes much less power than conventional Zener to a low-power-dissipation idle state. diode clamping circuits in the idle state.

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MOTOROLA INC. Technical Developments Volume14 December 1991

LOW LEAKAGE CURRENT ZENER DIODE CIRCUIT

by B. A. Snodgrass and J. M. Hudcock

  Figure 1 illustrates circuit 10 providing a low-power This impedance increases when the voltage on power voltage clamp in battery-backed RAM circuitry, Circuit bus 12 returns to acceptable levels and circuit 10 returns 10 consumes much less power than conventional Zener to a low-power-dissipation idle state.
diode clamping circuits in the idle state.

                                   Since idle state current draw and voltage clamp level Protected power bus 12 is connected to voltage are determined by voltage detector 14, shunt element 16 detector 14 and shunt element 16 via V,,,,, input 18. V,,, can be chosen to match the specitic load, power source, or input 20 is connected to signal return 22. In the absence expected over voltage wav&fonns. Low idle current draw of an overvoltage condition, terminal V,,, 24 is high allows extension of battery life in battery-powered circuits, impedance, minimiziig power consumption by shunt compared to conventional Zener diode clamping circuits. element 16. Leakage current is minimized as only V,,,,, Seiko part number S8074OAH is an example of a low idle input 18 draws power. When the voltage on power bus current voltage detector suitable for use as voltage detec- 12 rises, the impedance between terminal V,,, 24 and tor 14. Immediate applications include hand-held comput- V return input 20 drops, clamping the voltage on po...