Complementary Signal Termination Circuit With Regulated Transistor Resistance
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Solution Overview
Problem
Existing termination methods for non-volatile semiconductor memories (NVSMs) face challenges such as signal reflection, significant loading capacitance, and power dissipation due to the use of resistive devices, which can affect the reliability and efficiency of signal transmission in electronic devices.
Innovation Solution
A termination transistor with a drain node receiving a first complementary signal and a source node receiving a second complementary signal, coupled to a regulation circuit that generates a regulated voltage to maintain the transistor's conductive state, behaving as virtual resistors to absorb signal energy at a virtual ground, thereby reducing signal reflection and maintaining resistance across temperature and supply voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistive devices are used for termination, then signal reflection is reduced, but loading capacitance and power dissipation increase significantly
Solution Approach 1:
The patent changes the termination device from a resistive device to a transistor device, fundamentally altering the electrical parameters. The transistor operates in its linear region to provide termination functionality while consuming significantly less power and presenting lower capacitance compared to traditional resistive terminations.
Solution Approach 2:
The patent replaces the passive resistive termination mechanism with an active transistor-based termination mechanism. This substitution allows for dynamic control of the termination characteristics and achieves better performance in terms of power consumption and capacitance while maintaining signal reflection reduction.
2Reliability
If resistive devices are used for termination, then signal reflection is reduced, but loading capacitance increases significantly
Solution Approach 1:
The patent changes the termination device from a resistive device to a transistor device, fundamentally altering the electrical parameters. The transistor operates in its linear region to provide termination functionality while consuming significantly less power and presenting lower capacitance compared to traditional resistive terminations.
3Loss of energy
If a termination transistor is used, then power dissipation and loading capacitance are reduced, but maintaining constant resistance across temperature and voltage changes becomes challenging
Solution Approach 1:
The patent employs a regulation circuit that provides feedback control to the termination transistor. This feedback mechanism monitors and adjusts the transistor's operating parameters to maintain a substantially constant effective resistance despite variations in temperature and supply voltage, thereby achieving both low power dissipation and resistance stability.
Solution Approach 2:
The patent dynamically adjusts the transistor's operating parameters through the regulation circuit to compensate for environmental variations. By changing the gate voltage or other control parameters in response to temperature and voltage changes, the circuit maintains stable termination characteristics while keeping power consumption low.
Data Source
AI summary
Apparatuses including termination for complementary signals are described, along with methods for terminating complementary signals. One such apparatus includes a termination transistor including a first node configured to receive a first complementary signal and a second node configured to receive a second complementary signal. A regulation circuit can generate a regulated voltage to render the termination transistor conductive with a substantially constant resistance. In one such method, a first complementary signal is received at a drain of a termination transistor and a second complementary signal is received at a source of the termination transistor. Energy of the complimentary signals can be absorbed when the termination transistor is rendered conductive. Additional embodiments are also described.