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Receiver With Differential Current Switch Logic Output

IP.com Disclosure Number: IPCOM000061012D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Kroesen, RJ: AUTHOR [+3]

Abstract

This article concerns a receiver having differential outputs and employing a self-contained bias circuit rather than a voltage reference generator for the current switch. The receiver circuit shown in the above figure is designed to work at logic levels of +2.4 volts (logic 1) and 0.6 volt (logic 0). It is composed of two parts: a receiver part and a differential part. The receiver part consists of transistor T1, diode D1, and resistors Ri, R1, and R2. The balance of the circuit concerns the differential part and will be addressed later. The values of the components associated with the receiver part are chosen so as to keep the same input signal voltage level at the input of the differential current switch (Node B).

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Receiver With Differential Current Switch Logic Output

This article concerns a receiver having differential outputs and employing a self- contained bias circuit rather than a voltage reference generator for the current switch. The receiver circuit shown in the above figure is designed to work at logic levels of +2.4 volts (logic 1) and 0.6 volt (logic 0). It is composed of two parts: a receiver part and a differential part. The receiver part consists of transistor T1, diode D1, and resistors Ri, R1, and R2. The balance of the circuit concerns the differential part and will be addressed later. The values of the components associated with the receiver part are chosen so as to keep the same input signal voltage level at the input of the differential current switch (Node B). Different levels of power performance may be obtained by employing different values for R1 and R2 and selecting a power level for the differential output by assigning proper values to resistors RL, RR and R3. The table on the next page illustrates the results of a calculation for two performance levels of the receiver by simulation. Performance levels correlate with the two power levels shown. The differential part of the receiver takes an input signal from the receiver part and derives (logic 1) and (logic 0). (The voltage swing depends upon the values of RL, RR, and R3.) The cross-coupled diode (D2) is chosen such as to limit the base voltage of transistor T2 to +2.4 volts so that the collector...