PROPAGATION DELAY IN HIGH SPEED SILICON BIPOLAR AND GaAs HBT DIGITAL CIRCUITS

1990 ◽  
Vol 01 (01) ◽  
pp. 101-124 ◽  
Author(s):  
P.K. TIEN
Keyword(s):  
High Speed ◽  
Digital Circuits ◽  
Logic Gate ◽  
Current Mode ◽  
Propagation Delay ◽  
Digital Circuit ◽  
Large Signal ◽  
Current Mode Logic ◽  
Bipolar Technology ◽  
A Charge

The needs for multi-gigabits/second digital electronics in advanced lightwave systems have motivated R & D for the next generation of high speed bipolar technology. The speed of the digital circuit may be estimated from the propagation delay of the logic gate. We discuss physics of the delay and show that it is fundamentally limited by the time needed for turning on (off) a transistor and by the time for charging (discharging) of capacitances in the circuit. We present a large-signal theory based on a charge-control model for the calculation of these limits. The results obtained for emitter coupled logic and current mode logic are used to analyze current technologies of silicon bipolar and GaAs HBTs.

scholarly journals Hybrid Dynamic MCML Style: A High Speed Dynamic MCML Style

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Neeta Pandey ◽  
Damini Garg ◽  
Kirti Gupta ◽  
Bharat Choudhary
Keyword(s):  
Circuit Design ◽  
High Speed ◽  
Current Mode ◽  
Cmos Technology ◽  
Digital Circuit ◽  
Mixed Signal ◽  
Current Mode Logic ◽  
Digital Circuit Design ◽  
Pass Transistor ◽  
Logic Functions

This paper proposes hybrid dynamic current mode logic (H-DyCML) as an alternative to existing dynamic CML (DyCML) style for digital circuit design in mixed-signal applications. H-DyCML introduces complementary pass transistors for implementation of logic functions. This allows reduction in the stacked source-coupled transistor pair levels in comparison to the existing DyCML style. The resulting reduction in transistor pair levels permits significant speed improvement. SPICE simulations using TSMC 180 nm and 90 nm CMOS technology parameters are carried out to verify the functionality and to identify their advantages. Some issues related to the compatibility of the complementary pass transistor logic have been investigated and the appropriate solutions have been proposed. The performance of the proposed H-DyCML gates is compared with the existing DyCML gates. The comparison confirms that proposed H-DyCML gates is faster than the existing DyCML gates.

MOS CURRENT MODE LOGIC CIRCUITS: DESIGN CONSIDERATION IN HIGH-SPEED LOW-POWER APPLICATIONS AND ITS FUTURE TREND, A TUTORIAL

2005 ◽  
Vol 15 (03) ◽  
pp. 599-614 ◽  
Author(s):  
YUYU LIU ◽  
JINGUO QUAN ◽  
HUAZHONG YANG ◽  
HUI WANG
Keyword(s):  
Low Power ◽  
High Speed ◽  
Supply Voltage ◽  
Dynamic Logic ◽  
Current Mode ◽  
Digital Circuit ◽  
Future Trend ◽  
Low Noise ◽  
Mixed Signal ◽  
Current Mode Logic

In this paper, a logic style that is becoming increasingly popular is presented, which is called MOS Current Mode Logic (MCML). MCML is a novel and useful logic style for high-speed, low-power and mixed-signal applications. Its high-speed switching, low supply voltage and reduced output voltage swing contribute to its high performance, low power dissipation, and low noise features. MCML circuits are compared to several other logic styles, such as conventional static CMOS, dynamic logic, and traditional emitter coupled logic (ECL) in terms of power, delay and common mode noise immunity. MCML circuits seem to be very promising in high-speed, low-power and mixed-signal digital circuit applications, such as portable electronic devices, gigahertz microprocessors, and optical transceivers.

A LOW POWER AND VARIATION-INSENSITIVE CURRENT-MODE SIGNALING SCHEME

2013 ◽  
Vol 22 (08) ◽  
pp. 1350068
Author(s):  
XINSHENG WANG ◽  
YIZHE HU ◽  
LIANG HAN ◽  
JINGHU LI ◽  
CHENXU WANG ◽  
...  
Keyword(s):  
Low Power ◽  
High Speed ◽  
Current Mode ◽  
Signal Propagation ◽  
Cmos Technology ◽  
Propagation Delay ◽  
Noise Performance ◽  
On Chip ◽  
Variation Tolerance ◽  
Driving Signal

Process and supply variations all have a large influence on current-mode signaling (CMS) circuits, limiting their application on the fields of high-speed low power communication over long on-chip interconnects. A variation-insensitive CMS scheme (CMS-Bias) was offered, employing a particular bias circuit to compensate the effects of variations, and was robust enough against inter-die and intra-die variations. In this paper, we studied in detail the principle of variation tolerance of the CMS circuit and proposed a more suitable bias circuit for it. The CMS-Bias with the proposed bias circuit (CMS-Proposed) can acquire the same variation tolerance but consume less energy, compared with CMS-Bias with the original bias circuit (CMS-Original). Both the CMS schemes were fabricated in 180 nm CMOS technology. Simulation and measured results indicate that the two CMS interconnect circuits have the similar signal propagation delay when driving signal over a 10 mm line, but the CMS-Proposed offers about 9% reduction in energy/bit and 7.2% reduction in energy-delay-product (EDP) over the CMS-Original. Simulation results show that the two CMS schemes only change about 5% in delay when suffering intra-die variations, and have the same robustness against inter-die variations. Both simulation and measurements all show that the proposed bias circuits, employing self-biasing structure, contribute to robustness against supply variations to some extent. Jitter analysis presents the two CMS schemes have the same noise performance.

3.3-V BiCMOS current-mode logic circuits for high-speed adders

1996 ◽  
Vol 31 (8) ◽  
pp. 1165-1169 ◽  
Author(s):  
A. Bellaouar ◽  
H. Touzene
Keyword(s):  
High Speed ◽  
Current Mode ◽  
Logic Circuits ◽  
Current Mode Logic
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