Browse Prior Art Database

Low Power Receiver Circuit

IP.com Disclosure Number: IPCOM000048987D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Banker, DC: AUTHOR [+4]

Abstract

The disclosed low power, general-purpose interface (LPGPI) receiver circuit consists of a current switch driving a voltage-mode inverter. The circuit utilizes a current mirror for low power dissipation and reliable operation over a wide range of environmental conditions.

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Low Power Receiver Circuit

The disclosed low power, general-purpose interface (LPGPI) receiver circuit consists of a current switch driving a voltage-mode inverter. The circuit utilizes a current mirror for low power dissipation and reliable operation over a wide range of environmental conditions.

A current-mode input circuit was chosen for the low power receiver circuit because of its temperature stability and adjustable threshold. Reference voltage network R2, R3 was designed to optimize ground tracking and temperature stability for minimum threshold tolerance. Emitter current source T4 and mirror T5 generate a regulated source of current which is almost independent of power supply tolerance and input levels. The stable current source saves power under extreme voltage conditions and allows collector load resistor R1 to be designed for optimum output levels without the danger of T3 saturation. Inverter T6 provides TTL compatible output levels and drive capability. Since saturation clamping of T3 is not required, the reference source R2, RW is not loaded and may be shared with an adjacent receive cell. Mirror transistor T5 may also serve an adjacent cell, thus saving space and power. When an adjacent cell shares a reference circuit and a mirror transistor, power dissipation is 0.9 MW.

Features of LPGPI Receiver Circuit Small threshold variation - more noise tolerance.

Low power dissipation - 0.9 MW.

Current-mode circuit provides threshold temperature

compensation...