CMOS peak detector and AC filter

Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

307351, 307353, 307358, 307261, 307520, G01R 1902, G01R 1922

Patent

active

046348956

ABSTRACT:
The present invention relates to a CMOS peak detection circuit (10) which does not require a blocking diode as is used in conventional peak detection circuits. The detection circuit of the present invention comprises a comparator which functions to compare the current value of an AC input signal to a current peak value stored on a capacitor (16). The output of the comparator is connected to a NAND gate which in turn activates a CMOS transmission gate (12) disposed between the input signal line and the storage capacitor. When the current value of the input signal is greater than the current peak value stored on the capacitor, the CMOS transmission gate is turned on and the AC input signal is transferred to the storage capacitor. Alternatively, if the current value of the input signal is less than that stored on the capacitor, the NAND gate will not activate the CMOS transmission gate, and the input signal cannot pass to the capacitor. A negative peak detector can be formed merely by inverting the inputs to the comparator and resetting the storage capacitor to the positive power supply instead of the negative power supply. A tandem arrangement of a positive peak detector and a negative peak detector formed in accordance with the present invention may be utilized to determine the DC level of an AC input signal, since each detector will generate the peak positive and negative values of the input signal and the DC level is defined as the average value of these two peak values.

REFERENCES:
patent: 3921010 (1975-11-01), Griffin
patent: 4209717 (1980-06-01), Mahony
D. W. Grimes, Maximum-Voltage Sensor and Storage, IBM Technical Disclosure Bulletin, vol. 19, No. 5, Oct., 1976, pp. 1552-1553.
Designing With Operational Amplifiers . . . , J. G. Graeme, McGraw-Hill Book Co., 1977, pp. 74-79.
"Data Acquisition Components", 1980 IEEE ISSCC Digest of Technical Papers, Feb. 1980, F. Gasparik, pp. 132-133.
"Integrated Bandsplit Filter System . . . ", Microelectronics Journal, vol. 11, No. 6, 1980, R. Gregorian et al, pp. 5-12.
Operational Amplifier Characteristics and Applications, R. G. Irvine, Prentice-Hall, Inc. 1981, pp. 142-144; 196-197.
Op-Amps and Linear Integrated Circuit Technology, R. A. Grayakwod, Prentice-Hall, Inc., pp. 380-383.
"Peak Hold Frequency Monitor", New Electronics, vol. 15, No. 3, P. Gladdish, p. 27, 2/9/82.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

CMOS peak detector and AC filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with CMOS peak detector and AC filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CMOS peak detector and AC filter will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-685825

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.