发明名称 |
Apparatus for converting analog-format signals to pulse-format signals |
摘要 |
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.
|
申请公布号 |
US4616332(A) |
申请公布日期 |
1986.10.07 |
申请号 |
US19820423256 |
申请日期 |
1982.09.24 |
申请人 |
THE FOXBORO COMPANY |
发明人 |
ROBINSON, ROBERT J.;RICHARDSON, DAVID A. |
分类号 |
G01F1/60;G01K7/20;G06G7/161;G06G7/20;H03K7/06;H03K7/08;(IPC1-7):H03M5/08 |
主分类号 |
G01F1/60 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|