A Pulse-Code-Modulation (PCM) Telemetry System Utilizing Multiple Integrated Circuit Technologies

Abstract

This paper describes a Pulse-Code-Modulation (PCM) Telemetry System contained on a module that is unique in several ways: 1. Uses all Integrated Circuits (Ics). 2. Integrates many IC types and technologies for superior system physical, environmental, and performance characteristics. 3. Multiplexer section: a. Uses one type of IC (MCIS multifunction IC) b. Is bipolar (both positive and negative voltages can be multiplexed) c. Accepts low- or high-voltage inputs (±51.1 mv to ±5.11 v) d. Is extremely small and compact (5 ICs total, provides 48-channel multiplexing) e. Accepts both differential and single ended channels f. Is controlled by random or sequential addressing modes 4. Amplifier section: a. Has high input impedance (100 meg ohms) b. Has high common mode rejection (to 120 db) c. Has gain (1 or 100) d. Has sample and hold capability 5. Analog-to-Digital Converter (ADC) section: a. Is bipolar (both positive and negative voltages can be converted) b. Has high accuracy (10 bits) c. Uses current summation with successive approximation d. Has high speed (up to 1 MHz)