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Improving Amplifier Binary 1 to Binary 0 Ratio

IP.com Disclosure Number: IPCOM000092620D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Berding, AR: AUTHOR

Abstract

Conventional unipolar sense amplifiers normally include a first transistor driving a second transistor with both of the transistors having the same bias current. In such a configuration, the binary 1 to binary 0 ratio of the output is poorer than at its input since the gain is greater for 0's than 1's. In this device the bias currents are unbalanced resulting in an improved binary 1 to binary 0 ratio. In a circuit where the output 1 to 0 ratio is 4 to 1, the input 1 to 0 ratio is 2. 1 to 1. This improved ratio makes it easier to design the detector following the amplifier. If there is a positive input signal, the input transistor is biased with less current than the following transistor. If a negative input signal is employed, the input transistor has the higher bias current.

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Improving Amplifier Binary 1 to Binary 0 Ratio

Conventional unipolar sense amplifiers normally include a first transistor driving a second transistor with both of the transistors having the same bias current. In such a configuration, the binary 1 to binary 0 ratio of the output is poorer than at its input since the gain is greater for 0's than 1's. In this device the bias currents are unbalanced resulting in an improved binary 1 to binary 0 ratio. In a circuit where the output 1 to 0 ratio is 4 to 1, the input 1 to 0 ratio is 2. 1 to 1. This improved ratio makes it easier to design the detector following the amplifier.

If there is a positive input signal, the input transistor is biased with less current than the following transistor. If a negative input signal is employed, the input transistor has the higher bias current.

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