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Amplifier Circuit

IP.com Disclosure Number: IPCOM000097631D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Skerritt, JW: AUTHOR

Abstract

The amplifier operates on either positive or negative going inputs of widely varying amplitudes to provide an output which is of a single polarity and is of relatively uniform amplitude.

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Amplifier Circuit

The amplifier operates on either positive or negative going inputs of widely varying amplitudes to provide an output which is of a single polarity and is of relatively uniform amplitude.

The first stage includes transistor 1 to which is connected input capacitor 2 and a base supply including resistor 3. The latter is variable to adjust this stage for operation in the active region. The load for the first stage includes inductor 4 which is A. C. grounded by a capacitor 5. This load provides a ringing response, as indicated in the curve for point C, when an input transient (curve A) is coupled to the base of 1 (curve B). If the input transient is excessive, the collector swing of 1 is clipped by saturation or cut-off.

The second stage includes transistor 6 which is identical to the first stage except that its base supply resistor 7 is adjusted to maintain 6 normally near cut- off. The inductive load of 6 is a transformer 8. The final output is clipped by diode 9 and is unipolar.

Transistor 6, being normally near cut off, responds little to the positive spike of the ringing output of the first stage. Whether the initial input transient (curve A) is positive going or negative going, a negative transient is available at the output of the first stage (curve C). This negative going input to the second stage produces a ringing output from that stage (curve D). The final output at 10 resembles the positive spikes (curve D), the negative spikes being clip...