Dual phase pulse modulation encoder circuit

Details Dual phase pulse modulation encoder circuit Dual phase pulse modulation encoder circuit

2006-09-05

2006-09-05

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transmitters

Reexamination Certificate

active

07103110

ABSTRACT:
An dual phase pulse modulation (DPPM) encoder circuit converts data into a series of high and low signal pulses, each of whose time durations or pulse widths represents a group of M data bits, with the alternating high and low pulses representing successive groups. The encoder circuit may include a set of parallel-in, serial-out shift registers that subdivide received data words into the M-bit groups, a state machine that specified the pulse durations for each received group, e.g., by incrementing a state that indicates selected signal pulse transition times, a system clock delay chain with multiple taps, a multiplexer controlled by the state machine for successively selecting different taps, and a toggle flip-flop that is clocked by the multiplexer output.

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