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Noise Rejecting Pulse Amplifier

IP.com Disclosure Number: IPCOM000098346D
Original Publication Date: 1960-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

The circuit resembles a blocking oscillator with the important difference that the active device in the conventional oscillator is an inverter while in this circuit the active device is an emitter follower. The emitter follower amplifier provides the following desirable characteristics: 1. High input impedance does not load the output. 2. The frequency response is good at high frequencies. 3. The emitter follower drives the output directly. 4. The gain is a function of (alpha) is very near unity.

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Noise Rejecting Pulse Amplifier

The circuit resembles a blocking oscillator with the important difference that the active device in the conventional oscillator is an inverter while in this circuit the active device is an emitter follower. The emitter follower amplifier provides the following desirable characteristics: 1. High input impedance does not load the output.

2. The frequency response is good at high frequencies.

3. The emitter follower drives the output directly.

4. The gain is a function of (alpha) is very near unity.

This emitter follower type blocking oscillator is combined with an input circuit containing a reversely biased diode for purposes of rejecting noise pulses. The quiescent level at point A is two volts more negative than point B. Noise signals up to two volts are therefore rejected. A four volt signal pulse is regenerated to a full six volt pulse at the output.

The circuit is designed to operate on pulses from 0. 1 to 0.5 (mu) sec. duration at intervals of 0.5(mu) sec. and up. Be means of suitable changes in the component values, pulses of other frequencies and characteristics may be amplified.

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