Discrete-time analog-signal-processing devices based on IC monostable multivibrators.

The discrete analog-signal processing with charge-transfer devices(CTD's) has attracted special inerest recently. An impotrant limitation of CTD's arises from the effect of charge transfer inefficiency, and so especially in low frequency range CTD's cannot operate sufficiently. This paper proposes a new device for the implementation of discrete analog-signal processing. The device inherently differs from CTD's and is suitable for the applications in low frequency range. The device consists of a delay line that is constructed by monostable multivibrators with constant pulsewidths. In the device, signals appear in pulsewidth modulated forms, Without using analog memory elements, one stage of the delay line can be constructed by two IC monostable multivibrators and one IC AND gate. Fundamentally, the delay line has no degradation of signals during processing. Using this device practical digital filters are easily implemented. It will be able to make these filters one-chip processors.