Variable Pulse-Length Internal Signal Generation for Short Clock Periods
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Solution Overview
Problem
Conventional semiconductor integrated circuits face instability and increased current consumption due to fixed delay times in pulse generating apparatuses, which are inadequate for varying external clock signal periods, leading to malfunction when the period is short.
Innovation Solution
A pulse generating apparatus comprising a latch circuit, clock period detector, and delay controller that adjusts delay time based on detected clock signal periods to generate a stable pulse signal, ensuring efficient operation across different clock signal periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed delay time is used in the pulse generating apparatus, then the circuit structure is simple, but the circuit cannot operate stably when the external clock signal period is short
Solution Approach 1:
The delay time is made dynamically adjustable based on the external clock signal period. The delay controller receives the external clock signal and adjusts the delay time of the first signal accordingly, allowing the system to adapt to different clock periods and maintain stable operation.
Solution Approach 2:
The delay time parameter is changed based on the detected external clock signal period. When the clock period is short, the delay time is reduced to prevent malfunction; when the clock period is long, the delay time can be increased to optimize performance.
2Reliability
If the delay time is increased to ensure sufficient activation time, then the circuit operates reliably, but current consumption increases due to unnecessary activation
Solution Approach 1:
The delay time is dynamically adjusted based on the external clock signal period to match the actual activation requirements. This prevents unnecessary activation and reduces current consumption while maintaining reliable operation.
Solution Approach 2:
The delay time parameter is optimized based on the clock period to achieve the minimum necessary activation time, avoiding excessive delay that would cause unnecessary current consumption during non-activation periods.
3Use of energy by moving object
If the delay time is decreased to reduce current consumption, then energy efficiency improves, but the circuit may malfunction when the clock period is short
Solution Approach 1:
The delay time is dynamically adjusted based on the external clock signal period. When the clock period is short, the delay time is automatically increased to prevent malfunction; when the clock period is long, the delay time is reduced to save energy.
Solution Approach 2:
The delay time parameter is changed according to the detected clock period to achieve optimal balance between current consumption and operational reliability for each specific operating condition.
4Adaptability or versatility
If a fixed pulse width is generated, then the circuit design is simple, but the circuit cannot adapt to varying external clock signal periods
Solution Approach 1:
The pulse width is made dynamically adjustable through the delay controller that modifies the delay time based on the external clock signal period, allowing the system to adapt to different operating conditions.
Solution Approach 2:
The pulse width parameter is changed based on the detected clock period by adjusting the delay time of the first signal, enabling the circuit to generate appropriate pulse widths for different clock frequencies.
Data Source
AI summary
An apparatus for generating a pulse which generates an internal signal. The apparatus includes a latch circuit latching an input signal to output a first signal. A clock period detector detects a period of an external clock signal to output a period detecting signal and a delay controller adjusts a delay time of the first signal to output a second signal in response to the period detecting signal. A signal generator receives the first signal and the second signal to output a pulse signal.