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Utilizing Esaki Diode Latches

IP.com Disclosure Number: IPCOM000097524D
Original Publication Date: 1961-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Akmenkalns, IG: AUTHOR

Abstract

The Esaki diode latch circuit is controlled by alternately adding and subtracting a current of a short duration at the common diode and transistor base node. As shown above, the basic diode transistor latch consists of an inverter circuit and an Esaki diode in shunt with the emitter junction of the transistor. Resistor Rb supplies the required bias current to the transistor and the diode. For given values of supply voltage Vc and Rb, a load line may be drawn on the composite characteristic of the diode transistor circuit and two stable operating points exist. When the composite device is at one operating point, the diode absorbs the entire current from the bias source. If the circuit is transferred to the other operating point, a fraction of the bias current is switched into the transistor base.

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Utilizing Esaki Diode Latches

The Esaki diode latch circuit is controlled by alternately adding and subtracting a current of a short duration at the common diode and transistor base node. As shown above, the basic diode transistor latch consists of an inverter circuit and an Esaki diode in shunt with the emitter junction of the transistor. Resistor Rb supplies the required bias current to the transistor and the diode. For given values of supply voltage Vc and Rb, a load line may be drawn on the composite characteristic of the diode transistor circuit and two stable operating points exist. When the composite device is at one operating point, the diode absorbs the entire current from the bias source. If the circuit is transferred to the other operating point, a fraction of the bias current is switched into the transistor base. Since either operating point is stable, the transistor remains OFF or ON respectively. In this manner, the diode provides a storage function and a threshold sensitive switch with power gain to control the transistor.

A useful application of the latch exploits the threshold nature of the input characteristic in sense amplifiers. Two networks are shown which provide the required control circuits for the latch. In the top circuit a core is switched between its two states by current source I. A resistor couples the core to the latch, providing a control current magnitude proportional to the magnitude of the core output voltage. A capacitor is use...