Power and signal transfer interface circuit
First Claim
1. An interface circuit for providing a power source to a functional circuit block from a coupled alternating excitation source and a return transmission path from said block to said source comprising:
- a transistor,associated switch means, andenergy storage means,said transistor having a forward mode of operation, wherein it serves to rectify forwardly coupled excitation energy to thereby charge said energy storage means as said power source, anda reverse mode of operation wherein energy stored in said storage means is discharged to provide a back coupled pulse,said switch means being adapted to cooperate with said functional circuit block to controllably activate said reverse mode to provide said return transmission.
2 Assignments
0 Petitions
Accused Products
Abstract
An interface circuit serves to rectify excitation energy inductively coupled to a transistor acting in a diode configuration to charge a reservoir capacitor which may then serve as a power source. Switch means under the control of an external functional circuit block is arranged to bias the transistor into a reverse operating mode to itself act as a switch to discharge energy from the reservoir into the coupling. In this way pulses may be back coupled to be detected at the excitation source. The timing of the back coupled pulses may be information bearing.
-
Citations
9 Claims
-
1. An interface circuit for providing a power source to a functional circuit block from a coupled alternating excitation source and a return transmission path from said block to said source comprising:
-
a transistor, associated switch means, and energy storage means, said transistor having a forward mode of operation, wherein it serves to rectify forwardly coupled excitation energy to thereby charge said energy storage means as said power source, and a reverse mode of operation wherein energy stored in said storage means is discharged to provide a back coupled pulse, said switch means being adapted to cooperate with said functional circuit block to controllably activate said reverse mode to provide said return transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification