Data Processor Having Multiple Sections Activated at Different Times by Selective Power Coupling to the Sections Patent

Data processor having multiple sections activated at different times by selective power coupling to section

Oscillator circuit operates as digitally controlled frequency synthesizer

Oscillator circuit converts digital data from the format of binary information at several input terminals to the format of discrete frequencies at the output terminals. Each state of the input levels corresponds to one frequency at the output. This device provides a large number of accurately controlled frequencies from a single stable oscillator

Digital phase-locked loop

An digital phase-locked loop is provided for deriving a loop output signal from an accumulator output terminal. A phase detecting exclusive OR gate is fed by the loop digital input and output signals. The output of the phase detector is a bi-level digital signal having a duty cycle indicative of the relative phase of the input and output signals. The accumulator is incremented at a first rate in response to a first output level of the phase detector and at a second rate in response to a second output level of the phase detector

Novel shift register eliminates logic gates and power switching circuits

Register requiring two integrated circuits per stage has nominal power dissipation of 3.5 mW per stage, its use eliminates reset pulse, allowing data transfer to occur in less than 1 microsecond, and eliminates power application to both right and left portions of the register simultaneously

Apparatus for computing square roots Patent

Apparatus for computing square root

The SDP-3 - A computer for use on board small scientific spacecraft

SDP three computer for use aboard small scientific spacecraf

Simple circuit performs binary addition and subtraction

Ripple adder reduces the number of logic circuits required to preform binary addition and subtraction. The adder uses dual input and delayed output flip-flops in one register. The contents of this register are summed with those of a standard register through conventional AND/gates

Ripple add and ripple subtract binary counters Patent

Logic circuit to ripple add and subtract binary counters for spaceborne computer

Novel circuit combines pulse stretcher with NOR gate

A pulse-stretching circuit added to a conventional NOR gate circuit detects a preselected state and produces a pulse that the pulse stretcher maintains for a long enough period to reset all counter stages

Transistor voltage comparator performs own sensing

Detection of the highest voltage input among a group of varying voltage inputs is accomplished by a transistorized voltage comparison circuit. The collector circuits of the transistors perform the sensing function. Input voltage levels are governed by the transistors