Abstract: This circuit is a back terminated transmission line driver which dissipates no outgoing power across its back terminating resistor by using both a voltage source and a current source.

Abstract: This circuit is a back terminated transmission line driver which dissipates no outgoing power across its back terminating resistor by using both a voltage source and a current source.

Abstract: A method, apparatus and system for electronically verifying that a person using an electronic apparatus is who the person claims to be. It may be used for computers, e-commerce, financial transaction cards, automotive access and ignition, security badges, building access, cell phones and any other application in which electronic identification of a person is required. The security device in initiating a contact or in response to an inquiry as to identification transmits its public key identification number. The host encrypts a random message utilizing the user's public key identification number. Assuming the user is who the user claims to be, the user is able to decrypt the random message utilizing the user's corresponding private key. The private key never needs to be disclosed to anyone. The random message is changed with each use.

Abstract: A bias modulation amplitude monitoring system for a rotation sensor having a pair of output signal component detectors to provide magnitudes of the corresponding frequency components in that signal which are used by a component relationship determination arrangement capable of adjusting the output signal to have a selected value in a range of values for a selected rate of rotation thereof, and to correct variations therein, and having a reset arrangement capable of resetting the system if the output signal indicates an unwanted phase modulation amplitude.