PatentVote.com: Vote on your favourite invention!

Next ten patents ordered by date:
Gate input circuit for insulated gate field effect transistors
Hall effect-switching device
Circuit utilizing open-base transistor as leakage bypass device
Surface potential stabilizing circuit for charge-coupled devices radiation hardening
Acoustic emission transducer
Ultrasonic transducer with improved transient response and method for utilizing transducer to increase accuracy of measurement of an ultrasonic flow meter
Piezoelectric stack insulation
Signal generating mechanism
Apparatus using variations in magnetic force to reciprocate a linear actuator
Magnetic speed sensing mechanism
Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh 

 

Title: Dynamic filter

Abstract: A low noise resonant filter of wide dynamic range and low distortion is formed from a number of series-connected filter stages, each comprising a current integrating amplifier driven from transconductance formed from a bipolar differential pair with feedback to one member of the transconductance pair to maintain its transconductance substantially constant. A further bipolar differential pair transconductance at the input stage operates with a widely variable transconductance and provides soft limiting and wide dynamic range, especially when the filter is operated in the resonant mode.


Do you think this is a good invention? Vote now:

 Votes so far: For:(0) Against:(0)
Other info:


Inventors: Pearlman, Alan R. (Newton, MA, US)
Gillette, Timothy C. (Brookline, MA, US)

Application Number: 684788
Filing Date: 1976-05-10
Publication_date: 1977-03-08
Assignee: ARP Instruments, Inc. (Newton, MA)
Primary Class(es): 327/552 327/333, 327/590, 327/595, 330/107
Other Classes:
US Patent Ref:
3805091Apr, 1974Colin307/229.
3924199Dec, 1975Pearlman328/167.

Other Refs:
Primary Examiner: Miller, Jr., Stanley D.
Assistant Examiner: Davis, B. P.
Attorney: Cesari and McKenna