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Browse Prior Art Database

Emitter Follower Voltage Amplifier

IP.com Disclosure Number: IPCOM000098004D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Anderson, JL: AUTHOR

Abstract

The pulse amplifier employs a single transistor T connected in common collector configuration. T has an LC circuit in its base circuit to provide both voltage gain and power gain.

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Emitter Follower Voltage Amplifier

The pulse amplifier employs a single transistor T connected in common collector configuration. T has an LC circuit in its base circuit to provide both voltage gain and power gain.

When T is non-conductive, application of a positive input pulse at IN causes capacitor C to charge to a positive potential before T conducts due to the inductance of L1 and L2. The negative voltage -V provides a threshold for discriminating against input pulses of less than a desired amplitude. As T conducts, its emitter potential rises, raising the potential of C. Due to the inductive load on C, it cannot discharge instantaneously. It, therefore, acts as a battery to keep the base potential of T more positive than that of the emitter. As the emitter potential increases further, it attempts to decrease the base current. Concurrently with this phase of operation, inductive back voltages are generated in a direction to maintain the level of base current. Thus, as the emitter voltage rises, the base voltage also rises maintaining T in a conductive state to give voltage amplification of the input pulse.

This circuit, which has a low output impedance compared to its input impedance, provides a single output pulse, provided the input pulse width is less than 300 nsec. wide. If wider input pulses are employed, then multiple outputs are provided.

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