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2. Counter (digital) - Wikipedia

   en.wikipedia.org/wiki/Counter_(digital)

   For example, a four-bit counter can have a modulus of up to 16 (2^4). Counters are generally classified as either synchronous or asynchronous. In synchronous counters, all flip-flops share a common clock and change state at the same time. In asynchronous counters, each flip-flop has a unique clock, and the flip-flop states change at different ...

3. Asynchronous circuit - Wikipedia

   en.wikipedia.org/wiki/Asynchronous_circuit

   Asynchronous circuit (clockless or self-timed circuit) [1]: Lecture 12 [note 1][2]: 157–186 is a sequential digital logic circuit that does not use a global clock circuit or signal generator to synchronize its components. [1][3]: 3–5 Instead, the components are driven by a handshaking circuit which indicates a completion of a set of ...

4. List of 4000-series integrated circuits - Wikipedia

   en.wikipedia.org/wiki/List_of_4000-series...

   The following is a list of CMOS 4000-series digital logic integrated circuits.In 1968, the original 4000-series was introduced by RCA.Although more recent parts are considerably faster, the 4000 devices operate over a wide power supply range (3V to 18V recommended range for "B" series) and are well suited to unregulated battery powered applications and interfacing with sensitive analogue ...

5. Ring counter - Wikipedia

   en.wikipedia.org/wiki/Ring_counter

   The straight ring counter has the logical structure shown here: Instead of the reset line setting up the initial one-hot pattern, the straight ring is sometimes made self-initializing by the use of a distributed feedback gate across all of the outputs except that last, so that a 1 is presented at the input when there is no 1 in any stage but the last.

6. Quasi-delay-insensitive circuit - Wikipedia

   en.wikipedia.org/wiki/Quasi-delay-insensitive...

   The simplest QDI circuit is a ring oscillator implemented using a cycle of inverters. Each gate drives two events on its output node. Either the pull up network drives node's voltage from GND to Vdd or the pull down network from VDD to GND. This gives the ring oscillator six events in total. Multiple cycles may be connected using a multi-input ...

7. Pulse-width modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-width_modulation

   t. e. Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), [1] is any method of representing a signal as a rectangular wave with a varying duty cycle (and for some methods also a varying period). PWM is useful for controlling the average power or amplitude delivered by an electrical signal.