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Browse Prior Art Database

Clipping Level Detector

IP.com Disclosure Number: IPCOM000097685D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Dersch, WC: AUTHOR

Abstract

The provision of the three diodes D1, D2 and D3, connected in series in the emitter circuit of transistor T1 and poled in a common direction to pass current to T(1), causes their aggregate forward forming voltage to be increased with the addition of each diode D(1)...D(3). Using silicon diodes the curve d(2) represents current gain plotted against collector current for T(1) using only D(1) and D(2). The curve d(3) is produced by using all three diodes. A linear function r between d(2) and d(3) is achieved after firing of the diodes by shunting D(3) with a variable resistor R. High level clipping and accurately controlled gain is achieved in this manner. High level signals reduce the effect of fixed circuit noise. A diode D(c) acts as a clamp for these unipolar input signals.

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Clipping Level Detector

The provision of the three diodes D1, D2 and D3, connected in series in the emitter circuit of transistor T1 and poled in a common direction to pass current to T(1), causes their aggregate forward forming voltage to be increased with the addition of each diode D(1)...D(3). Using silicon diodes the curve d(2) represents current gain plotted against collector current for T(1) using only D(1) and D(2). The curve d(3) is produced by using all three diodes. A linear function r between d(2) and d(3) is achieved after firing of the diodes by shunting D(3) with a variable resistor R. High level clipping and accurately controlled gain is achieved in this manner. High level signals reduce the effect of fixed circuit noise. A diode D(c) acts as a clamp for these unipolar input signals. Final clipping and shaping circuitry CS is coupled to the collector of T(1). Similarly, softer diodes such as germanium render the curves g(2) and g(2) for two and three diodes, respectively.

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