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Peak and Valley Detector

IP.com Disclosure Number: IPCOM000095322D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Smith, WD: AUTHOR [+2]

Abstract

Either the maximum negative valley level or the minimum negative peak level of a time-varying negative analog input signal Ei occurring during a predetermined time interval is indicated by the output voltage Eo. For valley detection, control signal V is applied in parallel to And 13, Or 16, and relay R2. Application of V to 16 activates single-shot 17, causing relay R1 to close switch S. Such closure is for a time sufficient to discharge storage capacitor 18 and set the voltage at point A to a maximum negative level. The timing out of 17 activates interval timer 10. The level at A is transferred through the emitter followers Q3, Q4 and Q5 to the linear Inverter Q6 base. The output of Q6 is thus set to a minimum negative level. This is transferred through emitter-follower Q7 to valley output line 19.

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Peak and Valley Detector

Either the maximum negative valley level or the minimum negative peak level of a time-varying negative analog input signal Ei occurring during a predetermined time interval is indicated by the output voltage Eo. For valley detection, control signal V is applied in parallel to And 13, Or 16, and relay R2. Application of V to 16 activates single-shot 17, causing relay R1 to close switch
S. Such closure is for a time sufficient to discharge storage capacitor 18 and set the voltage at point A to a maximum negative level. The timing out of 17 activates interval timer 10. The level at A is transferred through the emitter followers Q3, Q4 and Q5 to the linear Inverter Q6 base. The output of Q6 is thus set to a minimum negative level. This is transferred through emitter-follower Q7 to valley output line 19. Because R2 is energized by V, the level on 19 is transferred to output line 20 and also, via feedback line 21, to the second input of comparator 11 which is receiving Ei at its first input.

An output is generated by 11 whenever Ei is more negative than Eo, causing an output to be transmitted from 13 through Or 15 to the Q1 base. This biases Q1 on and causes it to drive current source Q2, raising, i. e., making less negative the potential at A. As the level at A becomes less negative, the level on 19 proportionally becomes more negative until it is at the level of Ei. At this point, the output from 11 ceases, turning Q1 off and halting the volt...