Controllable signal conditioning circuit
US5844430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | May 21, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/086
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for controlling a variable threshold signal conditioning circuit to condition a variable amplitude periodic input signal in response to the control signals received. A plurality of transistor circuits, each responsive to a control signal, are disposed in parallel with the positive feedback resistor of a trigger circuit. The transistor circuits are controlled to adjust the upper threshold levels of the trigger circuit in order to reduce the false triggering effects of noise in the input signal. The lower threshold level is held constant at the input signal mid-line voltage while the upper threshold level is varied over a plurality of preprogrammed values. A microprocessor determines the appropriate threshold level for the circuit by comparing the timing signal output of the signal conditioning circuit to preprogrammed values stored in the microprocessor memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.