Statement-wise Verification

• Statement 1 - Correct.
  Asynchronous counters experience cumulative propagation delay due to ripple effect, limiting their operating speed in high-frequency applications.
  Asynchronous or ripple counters clock each stage from the previous stage, so propagation delays accumulate.
• Statement 2 - Incorrect.
  All synchronous counters are free from decoding glitches and hazards under all operating conditions.
  Synchronous clocking removes ripple delay but does not guarantee hazard-free decoding logic
• Statement 3 - Correct.
  Synchronous counters eliminate ripple delay by clocking all flip-flops simultaneously, thereby improving speed and reliability.
  Synchronous counters clock all flip-flops together and are therefore faster

Core Concept

Asynchronous or ripple counters clock each stage from the previous stage, so propagation delays accumulate. Synchronous counters clock all flip-flops together and are therefore faster, but combinational decoding can still exhibit hazards/glitches depending on implementation.

Formula / Key Relationship

Ripple delay roughly accumulates with number of stages.

Why the Other Options Are Wrong

Option A is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option B is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 2.

Exam Shortcut / Approach

Synchronous eliminates ripple-clock delay, not every possible logic hazard.

Common Mistake

Synchronous does not mean glitch-proof.

Quick Revision

Synchronous and Asynchronous Counters is linked with Counters, Sequential Logic and Digital Electronics. Synchronous eliminates ripple-clock delay, not every possible logic hazard.

Statement-wise Verification

• Statement 1 - Correct.
  Asynchronous counters experience cumulative propagation delay due to ripple effect, limiting their operating speed in high-frequency applications.
  Asynchronous or ripple counters clock each stage from the previous stage, so propagation delays accumulate.
• Statement 2 - Incorrect.
  All synchronous counters are free from decoding glitches and hazards under all operating conditions.
  Synchronous clocking removes ripple delay but does not guarantee hazard-free decoding logic
• Statement 3 - Correct.
  Synchronous counters eliminate ripple delay by clocking all flip-flops simultaneously, thereby improving speed and reliability.
  Synchronous counters clock all flip-flops together and are therefore faster

Core Concept

Asynchronous or ripple counters clock each stage from the previous stage, so propagation delays accumulate. Synchronous counters clock all flip-flops together and are therefore faster, but combinational decoding can still exhibit hazards/glitches depending on implementation.

Formula / Key Relationship

Ripple delay roughly accumulates with number of stages.

Why the Other Options Are Wrong

Option A is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option B is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 2.

Exam Shortcut / Approach

Synchronous eliminates ripple-clock delay, not every possible logic hazard.

Common Mistake

Synchronous does not mean glitch-proof.

Quick Revision

Synchronous and Asynchronous Counters is linked with Counters, Sequential Logic and Digital Electronics. Synchronous eliminates ripple-clock delay, not every possible logic hazard.

Statement-wise Verification

• Statement 1 - Correct.
  Asynchronous counters experience cumulative propagation delay due to ripple effect, limiting their operating speed in high-frequency applications.
  Asynchronous or ripple counters clock each stage from the previous stage, so propagation delays accumulate.
• Statement 2 - Incorrect.
  All synchronous counters are free from decoding glitches and hazards under all operating conditions.
  Synchronous clocking removes ripple delay but does not guarantee hazard-free decoding logic
• Statement 3 - Correct.
  Synchronous counters eliminate ripple delay by clocking all flip-flops simultaneously, thereby improving speed and reliability.
  Synchronous counters clock all flip-flops together and are therefore faster

Core Concept

Asynchronous or ripple counters clock each stage from the previous stage, so propagation delays accumulate. Synchronous counters clock all flip-flops together and are therefore faster, but combinational decoding can still exhibit hazards/glitches depending on implementation.

Formula / Key Relationship

Ripple delay roughly accumulates with number of stages.

Why the Other Options Are Wrong

Option A is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option B is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 2.

Exam Shortcut / Approach

Synchronous eliminates ripple-clock delay, not every possible logic hazard.

Common Mistake

Synchronous does not mean glitch-proof.

Quick Revision

Synchronous and Asynchronous Counters is linked with Counters, Sequential Logic and Digital Electronics. Synchronous eliminates ripple-clock delay, not every possible logic hazard.