Modulator having encoder for fault-adaptive pulse step modulator

摘要

A pulse step modulator (PSM) for an AM transmitter, including a plurality of unit step modules (M) connected in series with each module including a DC voltage source with an associated actuatable switch for, when actuated, turning on the associated module to provide a unit step voltage. An output circuit is connected to the series connected modules for providing an output voltage to a load. A plurality of module turn on signals are provided with each turn on signal serving to actuate one of the switched in one of the modules. The turn on signals are provided by circuitry including an addressable memory (50) and addressing means. Addressable storage locations each include a number of turn on signals. The addressable memory is provided with addressable storage locations with each storing and providing, when addressed, a pattern of control signals respectively associated with the modules. The memory is addressed with an address which has a turn on portion and a start point portion.