Apparatus for converting analog-format signals to pulse-format signals
US4616332A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1982 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | Sep 24, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06G7/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for converting an analog-format electrical signal or quantity (such as the magnitude of an electrical circuit element) into a corresponding pulse-format signal, preferably in the form of a train of periodic pulses the lengths of which are controllable as a percentage of the cyclic period. A pulsed duty-cycle signal is developed in a negative feedback loop around an integrator having an analog-format input signal. The integrator output controls the d-c level of an up-and-down ramp signal which is fed to a comparator to produce pulses during the times the ramp voltage is above (or below) the firing threshold of the comparator. These pulses control a switch between the integrator input and a reference voltage so as to produce a negative feedback signal for the integrator. The negative feedback action controls the d-c level at the integrator ouptut and thereby sets the pulse duty-cycle to a value such that the average signal level through the pulsed switch to the integrator input relates in prescribed fashion to the applied input signal. The duty-cycle signal developed through such feedback action corresponds directly to the magnitude of the applied input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.