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Peak Detection Amplifier

IP.com Disclosure Number: IPCOM000097758D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Crouse, WG: AUTHOR

Abstract

The peak detection amplifier has three possible gains due to a nonlinear feedback impedance which exhibits a high impedance over a predetermined output range with a low impedance occurring at each extreme.

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Peak Detection Amplifier

The peak detection amplifier has three possible gains due to a nonlinear feedback impedance which exhibits a high impedance over a predetermined output range with a low impedance occurring at each extreme.

The circuit outside the dot dash area is a linear amplifier including a transistor
1. Its input is applied through a capacitor C3 to the base of the transistor, the output is from the collector. A first non-linear feedback path from the collector to the base is provided by a diode D1 in series with capacitor C1. A positive voltage Vo+ is applied to the junction of D1 and C1 through resistance R1. A second non-linear feedback path comprises a diode D2 in series with a capacitor C2. A negative voltage Vo- is applied through resistance R2 to the junction of D2 and C2. When the input voltage is more positive than Vo+, D1 conducts. When the input is more negative than Vo-, D2 conducts so that the nonlinear feedback has a high impedance over the predetermined range and a low impedance at either extreme.

When the sign of the slope of the input signal changes, the output changes quickly to the high impedance range of the non-linear feedback impedance. This results from the capacitive reactance on the input passing only changes of signal and not D.C, levels. Thus, if the signal change exceeds a predetermined minimum, then following each change of sign of slope of the input signal the output quickly traverses the output signal range where the non...