Signal Driver Circuit with Delayed Feedback for Full Output Swing
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Solution Overview
Problem
Conventional semiconductor apparatuses face challenges in maintaining sufficient setup and hold margins due to insufficient enabled intervals of clock signals, especially under PVT variations, leading to reduced swing ranges of output signals when transmitting high-speed signals.
Innovation Solution
A signal driver circuit comprising a pre-driving circuit, a driving signal generating circuit, a main driving circuit, and an output control circuit, which generates and adjusts pull-up and pull-down driving signals based on input and clock signals, along with complementary delayed output signals, to ensure full signal swing and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the enabled interval of the clock signal is increased to ensure setup and hold margins, then the signal transmission reliability is improved, but the power consumption increases and the circuit speed is reduced
Solution Approach 1:
The pre-driving circuit generates pre-driving signals in advance before the main driving circuit operates. This preliminary action prepares the signal transmission line ahead of time, allowing the main driving circuit to complete its operation within a shorter enabled interval of the clock signal, thereby reducing power consumption while maintaining reliable setup and hold margins
Solution Approach 2:
The driving circuit is divided into two separate circuits: a pre-driving circuit that operates earlier to initialize signal levels, and a main driving circuit that operates later to complete the signal transition. This segmentation allows each circuit to operate more efficiently with shorter clock enabled intervals, reducing overall power consumption while ensuring reliable signal transmission
2Reliability
If the enabled interval of the clock signal is increased to ensure setup and hold margins, then the signal transmission reliability is improved, but the circuit operation speed is reduced
Solution Approach 1:
The pre-driving circuit performs preliminary signal preparation before the main driving circuit operates, advancing the signal state to reduce the time required for the main driving operation. This allows the clock signal's enabled interval to be shortened while still maintaining adequate setup and hold margins, thereby increasing circuit operation speed without sacrificing reliability
Solution Approach 2:
By segmenting the driving function into pre-driving and main driving circuits with different timing characteristics, the overall signal transition is completed more efficiently. The pre-driving circuit handles initial signal preparation while the main driving circuit completes the transition, enabling faster operation within shorter clock enabled intervals while ensuring reliable setup and hold margins
3Manufacturing precision
If the load on the signal transmission line is reduced to improve signal swing range, then the output signal quality is improved, but the driving capability is reduced
Solution Approach 1:
The pre-driving circuit prepares the signal transmission line in advance by establishing preliminary voltage levels and reducing initial load conditions. This preliminary action creates more favorable conditions for the main driving circuit to achieve full signal swing range without requiring excessive driving power, thereby improving output signal quality while maintaining adequate driving capability
Data Source
AI summary
A signal driver circuit includes a pre-driving circuit, a driving signal generating circuit, a main driving circuit, and an output control circuit. The pre-driving circuit is configured to generate a first pre-driving signal and a second pre-driving signal based on an input signal and a clock signal. The driving signal generating circuit is configured to generate a pull-up driving signal and a pull-down driving signal based on the first pre-driving signal, the second pre-driving signal, and a complementary delayed output signal. The main driving circuit is configured to generate an output signal based on the pull-up driving signal and the pull-down driving signal. The complementary delayed output signal is generated by delaying the output signal. The output control circuit is configured to latch the output signal and configured to delay the output signal to generate a delayed output signal and the complementary delayed output signal.