APPARATUS FOR PROVIDING AN ANALOG OUTPUT IN RESPONSE TO A DIGITAL INPUT

摘要

An analog output signal is provided in response to a digital input signal by means which include a read only memory which has been programmed to provide an analog function of an input signal and a binary scaling means, such as an R-2R ladder network connected to the output of the memory. The memory may be programmed to provide a sinusoidal function of the digital input signal whereby a digital-to-resolver conversion occurs and the analog resolver equivalent of the digital input is provided. Alternatively, a filter response, such as a band pass response, may be provided for an analog signal by programming the memory to provide an attenuation function in response to a digital input signal which is associated with the value of the input frequency of the analog signal, the analog signal being fed through the output stage of the memory. Clearly, the memory may be programmed for other applications in which an analog output signal is provided in response to a digital input signal.